Triumph TR4 Specs
One body, one wheelbase and one standard engine size from 1961 to 1967, on two frames: the TR4, the TR4A with independent rear suspension or a live axle, and the Dové fastback on each, side by side, with what the road tests, the clubs and the specialists recorded.
From the first TR4 of July 1961 to the last TR4A of July 1967 the body, the wheelbase and the size of the standard engine stayed the same. The frame changed once, for the TR4A of 1965, which also brought independent rear suspension, and in North America a TR4A could still be had with the TR4's live axle. L. F. Dove's fastback conversion, the Dové GTR4, was built on both.
The tables set out five specifications side by side: the TR4, the TR4A IRS, the TR4A with its live axle, and the Dové on the TR4 and on the TR4A. Each shows one figure, the reading the sources best support. A small asterisk beside a figure means that another figure is in print, and opens a note with every reading and its source; the "i" beside each table's heading lists the sources for the whole table. The sections below explain what the tables cannot: how the figures were rated and measured, where the sources disagree, and the details that have no row of their own.source 1source 2source 3source 4source 5source 6
The engine and its service data
Every TR4, TR4A and Dové has the same engine: a four-cylinder in line, with a cast-iron block and head, pushrod-operated overhead valves, three main bearings and wet cylinder liners of nickel-chrome iron, centrifugally cast. The liners could be changed for smaller ones, and to special order the TR4 had the TR3A's 2-litre engine, for racing in the 2-litre class, with engine numbers prefixed CTA, as the Vintage Triumph Register reads them. A low-compression head was offered for countries with poor fuel.
The TR4 began with twin SU carburettors and changed to Zenith-Stromberg carburettors during 1963; TR4As had both, Strombergs first and SUs again later, from CTC62191 by the Vintage Triumph Register's account or CTC61291 by Revington TR's. Their change points are on the TR4 and TR4A pages.
Rimmer's parts catalogue adds service data that the tables do not hold, and the German TR Register's guide the thermostat:source 2source 6source 4source 7source 8source 1
| Item | Figure | Source |
|---|---|---|
| Spark-plug gap | 0.64 mm (0.025 in) | Rimmer |
| Idle speed | 800 to 850 rpm; 850 to 900 rpm on American TR4As | Rimmer |
| Thermostat opens at | 74 °C | The German TR Register's guide |
Power and torque, by rating
The sources rated the TR4's power in two ways, and each figure in the tables carries its rating. Motor Trend gave both in 1961, a net figure and a higher gross one at a slightly higher engine speed, and Motor Sport's road test of 1963 did the same, the net figure in its text and the gross one in its data panel. Figures on different ratings are not directly comparable. Some sources, the TR Drivers' Club and Krause among them, give the gross figure at the net figure's engine speed, which mixes the two ratings.
The TR4A's net figure is better attested than its gross one, which only Ate Up With Motor gives, and the engine speed of its peak is not settled: the German TR Register's guide and the TR Drivers' Club disagree. The German guide prints its torque figures in newton-metres where the numbers are plainly pound-feet; the tables give them in pound-feet.source 3source 4source 9source 10source 11source 6source 12
Transmission
The gearbox (transmission) has four speeds, all with synchromesh, in an aluminium casing with an integral bellhousing. Laycock de Normanville overdrive was an option on the three upper gears. The tables give the gearbox's own ratios; Motor Sport's test car of 1963 had overall ratios of 6.09, 4.02 and 3.04 to 1 in overdrive second, third and top on the standard axle.
The standard final drive is in the tables. A 4.1 to 1 axle was offered with overdrive only, yet the two overdrive cars tested in 1963, Motor Sport's TR4 and Autocar's Dové, kept the standard one. The clutch is a single dry plate, worked hydraulically, and the American TR4A had a diaphragm clutch of 21.6 cm (8½ in).
Rimmer gives the oils: 1.13 litres (2 imperial pints) in a gearbox without overdrive and 2 litres (3½ pints) with it; 0.8 litres (1½ pints) in a live axle and 1.42 litres (2½ pints) in the TR4A's independent rear axle.source 2source 6source 4source 5source 11source 13source 1
Chassis, steering, suspension, brakes and wheels
The TR4's frame is a box-section ladder frame with cross-bracing, the TR3A's widened at the front; the TR4A's is new, and the live-axle TR4A uses the same new frame. Steering is by rack and pinion, through a collapsible column adjustable for reach; Motor Sport counted 2½ turns from lock to lock in 1961 and 2⅔ in 1963, and the TR4A's steering was geared about a fifth slower. The turning circle is about 10 m (33 ft), by Motor Trend's and Autosport's measures.
At the front are unequal double wishbones and coil springs, with telescopic dampers inside the springs, a ball joint at the top and a trunnion at the bottom. At the back the TR4 has a live axle on leaf springs with lever-arm dampers, which Motor Trend in 1961 wrongly called telescopic. The TR4A IRS has semi-trailing aluminium arms, coil springs and lever-arm dampers set crosswise, though the importer's newsletter of 1965 listed telescopic ones.
The brakes are Girling, discs at the front and drums at the back, with smaller, lighter Girling 16P front calipers from CT4388 on cars with disc wheels and CT4690 on cars with wire wheels, by the TR Drivers' Club's account. The tracks differ from car to car:
| Car | Front track | Rear track | Source |
|---|---|---|---|
| TR4, on disc wheels | 124 cm (49 in) | 122 cm (48 in) | Car and Driver, 1961; the TR Drivers' Club |
| TR4A IRS | 124.5 cm | 123.0 cm | The German TR Register's guide |
| TR4A with a live axle | 124.5 cm | 122.0 cm | The German TR Register's guide |
On wire wheels each of the TR4's tracks was 2.5 cm (1 in) wider, Car and Driver reported. Rimmer gives the tyre pressures as 1.4 bar (20 psi) front and 1.7 bar (24 psi) rear for cross-ply tyres, and 1.7 and 1.9 bar (24 and 28 psi) for radials.source 6source 2source 3source 14source 15source 4source 7source 11source 13source 1
Dimensions and weights
The wheelbase never changed. Most road tests give a longer length than the factory's; Ate Up With Motor presumes that the tests measured over the overriders (bumper guards).
Weights differ most, because the sources weighed different things. The factory's own figure, printed in the importer's newsletter at the American launch, is a dry weight; Motor Trend weighed its car with fuel, oil and water; Motor Sport gave the kerb weight of its hardtop car; Car and Driver's data of 1964 gave a weight and its front-to-rear split; and the German TR Register's guide gives kerb weights with no more said. Each figure has its scope in its note. The factory's figures, as Ate Up With Motor quotes them, make the TR4A about 50 kg (112 lb) heavier than the TR4, yet the German guide gives the TR4A the lower kerb weight of the two; no source read explains the difference. The commission plate also states a gross laden weight, the Vintage Triumph Register notes.source 11source 3source 4source 16source 17source 6source 10source 18
Performance, test by test
Every speed and time in the tables is either a road test's measurement or a maker's claim, and its note says which, with the car and the gear. The makers claimed a top speed and a time to 97 km/h (60 mph) in September 1961. Motor Trend's timed speed was a one-way run by a pre-production open car in overdrive top; Motor Sport's was the "absolute" top speed of a hardtop car with overdrive; Road & Track's time to 97 km/h (60 mph), in 1962, is known through the Vintage Triumph Register; and Car and Driver's data of 1964 gave its speed in direct top and in overdrive separately. A lower set of figures, printed by the TR Register and by Krause, names no test at all, and the road tests explain where it probably comes from.
Motor Trend reached 80 km/h (50 mph) from rest in about 7.5 seconds and went from 48 to 80 km/h (30 to 50 mph) in top gear in 7.7; Motor Sport reached 113 km/h (70 mph) in 16.5 seconds; and Autocar's open TR4 of January 1962 took 25.4 seconds from 129 to 161 km/h (80 to 100 mph) in top. For the TR4A the sources read have no full test, only the maker's claims in its advertising of 1966 and Krause's judgement that it was a little slower than the TR4.source 15source 3source 18source 4source 16source 19source 5source 20
The TR4A with a live axle
The live-axle TR4A differs from the TR4A IRS only behind the seats: in place of the bridge and the trailing arms it has a live axle on leaf springs, on brackets added to the new frame, with lever-arm dampers. The German TR Register's guide gives it a rear track 1 cm narrower; it takes less oil in the axle; from about CT70000 its exhaust had one silencer, mounted crosswise; and Krause gives it a lower weight.source 8source 6source 1source 21source 10
The Dové GTR4
The Dové is a TR4 or TR4A from the windscreen (windshield) forward, mechanically unchanged, so its columns follow the base cars'. What differs is behind the doors: a glass-fibre roof that stands taller than the TR4's hood (soft top), and a bigger fuel tank, whose stated size John Bolster of Autosport doubted. The Dové's weight gain was far above the maker's claim, and the note to the tables gives Autocar's figure with what it was measured against.source 5source 22source 23
Colours and trim
No source read gives a factory colour list for either car. The Vintage Triumph Register names only families of colour for the TR4, and six colours were announced for its American launch, Signal Red and Powder Blue among them. The commission plate carries the codes for paint and trim from 1963 on. Rimmer explains the system: Triumph's paint codes are numbers grouped by basic colour, Signal Red being 32, and a trim code's prefix shows the material, H for leather and C for cloth, with none for leathercloth.
The seats were trimmed in PVC leathercloth as standard, with leather an option; American TR4As came with leather seats and carpet. The Vintage Triumph Register notes that a TR4's floor had a black rubber mat in front and charcoal loop-pile carpet behind the seats, the only colour offered.source 18source 24source 2source 13source 17
Production
Sources for Production, by version
- Price new
- TR4: Several figures in print.Gregor Grant, "The Triumph TR4", Autosport, 14 Sep 1962, pp. 359–362source 14; Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11; Motor Sport, "Matters Of Moment, November 1962", Nov 1962, p. 9source 25; Motor Sport, "The Triumph TR4: a rugged British sports car", with the data panel "The Triumph TR4 hard-top", Jan 1963, pp. 9–10source 4; Graham Robson, "One Design, Many Derivatives", Moss Motoring, 26 Oct 2022source 26; Triumph Sports Owners Association, Triumph Sports Owners Association Newsletter, April 1964, Apr 1964 (vol. 10 no. 4)source 16
- GTR4: Several figures in print.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5; Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11; Steve Dival, "The Dove GTR4", TR Drivers Clubsource 23
- Built
- TR4: Several figures in print.Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1; Arthur Kelly (the VTR's TR4 consultant), "TR4": "A Historical Overview of the TR4" and the TR4 commission-number page, Vintage Triumph Registersource 18; Ian Nicholls, "The Rover-Triumph story": "1960: expansion" and "1961: Leyland's takeover", AROnline, 7 Jul 2019source 27; Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11; TR Register, "Triumph TR4 / TR4A Buyers Guide"source 19
- TR4A IRS: One good source.TR4A commission numbers, first and last. Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1
- TR4A (solid axle): One good source.TR4A commission numbers, first and last. Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1
- GTR4: One good source.The test car. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Conversions on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Designers
- TR4: One good source.Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1
- TR4A IRS: One good source.TR4A, basic summary. Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1
- TR4A (solid axle): One good source.TR4A, basic summary. Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1
- Coachbuilders
- GTR4: Several figures in print.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5; Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Built at
- TR4: Several figures in print.TR Register, "Triumph TR4 / TR4A Buyers Guide"source 19; Revington TR, "TR4"source 28
- TR4A IRS: One good source.The production table's heading. Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1
- TR4A (solid axle): One good source.The production table's heading. Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1
- GTR4: One good source.The conversion; the base car from Canley. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
| Item | TR4 | TR4A IRS | TR4A (solid axle) | GTR4 | GTR4A |
|---|---|---|---|---|---|
| Price new | £750 basic; over £1,000 with tax (by £32 5s 3d) Price new, TR4 Several figures in print.
| Not in the sources read | Not in the sources read | £1,093 basic + £157 purchase tax = £1,250 Price new, GTR4 Several figures in print.
| Not in the sources read |
| Built | 18 Jul 1961 (CT1, first car built) Built, TR4 Several figures in print.
| CTC50006 (5 Jan 1965) to CTC78684 (11 Jul 1967) | CTC50006 (5 Jan 1965) to CTC78684 (11 Jul 1967) | June 1963 (the first of its kind) | 1965 and 1966 |
| Designers | Michelotti (body) | Giovanni Michelotti (body) | Giovanni Michelotti (body) | Not in the sources read | Not in the sources read |
| Coachbuilders | Not in the sources read | Not in the sources read | Not in the sources read | Thomas Harrington Ltd., Hove Coachbuilders, GTR4 Several figures in print.
| Not in the sources read |
| Built at | Speke, Liverpool (body shells) | Canley | Canley | Hove (body) | Canley, Coventry |
Engine
Sources for Engine, by version
- Capacity
- TR4: Several figures in print.Dennis May, "Technical Report" on the TR-4 (cover story), Car and Driver, Oct 1961, pp. 19–23source 2; Bill Boddy ("W. B."), "The new Triumph TR4", Motor Sport, Sep 1961, p. 17source 15; Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1
- TR4A IRS: One good source.TR Register, "Triumph TR4 / TR4A Buyers Guide"source 19
- TR4A (solid axle): One good source.TR Register, "Triumph TR4 / TR4A Buyers Guide"source 19
- GTR4: One good source.The test title. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Engine position
- TR4: One good source.Dennis May, "Technical Report" on the TR-4 (cover story), Car and Driver, Oct 1961, pp. 19–23source 2
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Block
- TR4: One good source.Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Cylinder head
- TR4: One good source.Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Valve gear
- TR4: One good source.Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Bore × stroke
- TR4: Several figures in print.Bill Boddy ("W. B."), "The new Triumph TR4", Motor Sport, Sep 1961, p. 17source 15; Motor Sport, "The Triumph TR4: a rugged British sports car", with the data panel "The Triumph TR4 hard-top", Jan 1963, pp. 9–10source 4
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Compression ratio
- TR4: Several figures in print.Dennis May, "Technical Report" on the TR-4 (cover story), Car and Driver, Oct 1961, pp. 19–23source 2; Motor Sport, "The Triumph TR4: a rugged British sports car", with the data panel "The Triumph TR4 hard-top", Jan 1963, pp. 9–10source 4
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Fuel system
- TR4: One good source.The January 1963 test car. Motor Sport, "The Triumph TR4: a rugged British sports car", with the data panel "The Triumph TR4 hard-top", Jan 1963, pp. 9–10source 4
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Carburettors
- TR4: Several figures in print.TR Register, "Triumph TR4 / TR4A Buyers Guide"source 19; Motor Sport, "The Triumph TR4: a rugged British sports car", with the data panel "The Triumph TR4 hard-top", Jan 1963, pp. 9–10source 4; TR Drivers Club, "Triumph TR4"source 7; Revington TR, "TR4: Technical Specification Change Points"source 29
- GTR4: One good source."the test car preceded" the change to Stromberg. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- Cooling
- TR4: One good source.Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Cylinder layout
- TR4: One good source.Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Cylinders
- TR4: One good source.Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Fuel
- TR4: One good source.The Dové GTR4 test car, mechanically a TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Ignition
- TR4: One good source.TR4 and TR4A. Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Cycle
- TR4: One good source.TR4 and TR4A. Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Lubrication
- TR4: One good source.TR4 and TR4A. Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
| Item | TR4 | TR4A IRS | TR4A (solid axle) | GTR4 | GTR4A |
|---|---|---|---|---|---|
| Capacity | 2138 cc Capacity, TR4 Several figures in print.
| 2138 cc | 2138 cc | 2138 cc | 2138 cc |
| Engine position | Front | Front | Front | Front | Front |
| Block | Cast iron | Cast iron | Cast iron | Cast iron | Cast iron |
| Cylinder head | Cast iron | Cast iron | Cast iron | Cast iron | Cast iron |
| Valve gear | OHV, two valves per cylinder | OHV, 2 valves per cylinder | OHV, 2 valves per cylinder | OHV, 2 valves per cylinder | OHV |
| Bore × stroke | 86/92 mm Bore × stroke, TR4 Several figures in print.
| 86 x 92 mm | 86 x 92 mm | 86.0 x 92.0 mm | 86.0 x 92.0 mm |
| Compression ratio | 9.0:1 Compression ratio, TR4 Several figures in print.
| 9.0:1 | 9.0:1 | 9.0:1 | 9.0:1 |
| Fuel system | Carburetor | Carburetor | Carburetor | Carburetor | Carburetor |
| Carburettors | Twin 1¾" SU Carbs Carburettors, TR4 Several figures in print.
| Not in the sources read | Not in the sources read | S.U. | Not in the sources read |
| Cooling | Water-cooled | Water-cooled | Water-cooled | Water-cooled | Water-cooled |
| Cylinder layout | Inline | Inline | Inline | Inline | Inline |
| Cylinders | 4 | 4 | 4 | 4 | 4 |
| Fuel | premium-grade petrol (97 octane RM) | Petrol | Petrol | premium-grade petrol (97 octane RM) | Petrol |
| Ignition | Coil and distributor | Coil and distributor | Coil and distributor | Coil and distributor | Coil and distributor |
| Cycle | Four-stroke | Four-stroke | Four-stroke | Four-stroke | Four-stroke |
| Lubrication | Wet Sump | Wet Sump | Wet Sump | Wet Sump | Wet Sump |
Performance
Sources for Performance, by version
- Power
- TR4: Several figures in print.Gordon Wilkins, "Report: New Triumph TR-4", Motor Trend, Dec 1961, pp. 64–66source 3; Bill Boddy ("W. B."), "The new Triumph TR4", Motor Sport, Sep 1961, p. 17source 15; Dennis May, "Technical Report" on the TR-4 (cover story), Car and Driver, Oct 1961, pp. 19–23source 2; TR Register, "Triumph TR4 / TR4A Buyers Guide"source 19; Motor Sport, "The Triumph TR4: a rugged British sports car", with the data panel "The Triumph TR4 hard-top", Jan 1963, pp. 9–10source 4; Triumph Sports Owners Association, Triumph Sports Owners Association Newsletter, April 1964, Apr 1964 (vol. 10 no. 4)source 16; TR Drivers Club, "Early Cars: The TR4"source 9
- TR4A IRS: Good sources disagree.Motor Sport, "Matters of moment, April 1965", Apr 1965, p. 11source 30; Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11; TR Register, "Triumph TR4 / TR4A Buyers Guide"source 19; Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6; TR Drivers Club, "Early Cars: The TR4A"source 12
- TR4A (solid axle): Good sources agree."All cars had 104bhp/2138cc"; rating not stated. TR Register, "Triumph TR4 / TR4A Buyers Guide"source 19; Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11; TR Drivers Club, "Early Cars: The TR4A"source 12
- GTR4: One good source.Net, at 4,600 rpm. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Torque
- TR4: Several figures in print.Dennis May, "Technical Report" on the TR-4 (cover story), Car and Driver, Oct 1961, pp. 19–23source 2; TR Register, "Triumph TR4 / TR4A Buyers Guide"source 19; Gordon Wilkins, "Report: New Triumph TR-4", Motor Trend, Dec 1961, pp. 64–66source 3; Triumph Sports Owners Association, Triumph Sports Owners Association Newsletter, April 1964, Apr 1964 (vol. 10 no. 4)source 16
- TR4A IRS: Good sources agree.Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11; TR Drivers Club, "Early Cars: The TR4A"source 12; Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): Good sources agree.Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11; TR Drivers Club, "Early Cars: The TR4A"source 12
- GTR4: One good source.At 3,350 rpm. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Top speed
- TR4: Several figures in print.Motor Sport, "The Triumph TR4: a rugged British sports car", with the data panel "The Triumph TR4 hard-top", Jan 1963, pp. 9–10source 4; Gordon Wilkins, "Report: New Triumph TR-4", Motor Trend, Dec 1961, pp. 64–66source 3; Triumph Sports Owners Association, Triumph Sports Owners Association Newsletter, April 1964, Apr 1964 (vol. 10 no. 4)source 16; Bill Boddy ("W. B."), "The new Triumph TR4", Motor Sport, Sep 1961, p. 17source 15; TR Register, "Triumph TR4 / TR4A Buyers Guide"source 19; G. William Krause, The Illustrated History of Triumph Sports and Racing Cars, CarTech, 2017source 10
- TR4A IRS: One good source.Maker's claim; "cruises comfortably at 90 mph". Motor Sport, "Cornering fast in a Triumph TR4A…" (Standard-Triumph advertisement, with price list), May 1966, p. 49source 20
- GTR4: Several figures in print.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- 0–60 mph
- TR4: Several figures in print.Arthur Kelly (the VTR's TR4 consultant), "TR4": "A Historical Overview of the TR4" and the TR4 commission-number page, Vintage Triumph Registersource 18; Gordon Wilkins, "Report: New Triumph TR-4", Motor Trend, Dec 1961, pp. 64–66source 3; Triumph Sports Owners Association, Triumph Sports Owners Association Newsletter, April 1964, Apr 1964 (vol. 10 no. 4)source 16; Bill Boddy ("W. B."), "The new Triumph TR4", Motor Sport, Sep 1961, p. 17source 15; TR Register, "Triumph TR4 / TR4A Buyers Guide"source 19; G. William Krause, The Illustrated History of Triumph Sports and Racing Cars, CarTech, 2017source 10
- Standing start
- TR4: Several figures in print.Arthur Kelly (the VTR's TR4 consultant), "TR4": "A Historical Overview of the TR4" and the TR4 commission-number page, Vintage Triumph Registersource 18; Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5; Bill Boddy ("W. B."), "The new Triumph TR4", Motor Sport, Sep 1961, p. 17source 15
- GTR4: One good source.Standing quarter-mile; 17.8 s for the open TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
| Item | TR4 | TR4A IRS | TR4A (solid axle) | GTR4 | GTR4A |
|---|---|---|---|---|---|
| Power | 100 bhp Power, TR4 Several figures in print.
| 104 bhp Power, TR4A IRS Good sources disagree.
| 104 bhp | 100 bhp | 104 bhp |
| Torque | 127 lb ft Torque, TR4 Several figures in print.
| 132 lb ft | 132 lb ft | 127 lb ft | 132 lb ft |
| Top speed | 110 mph Top speed, TR4 Several figures in print.
| 110 mph | Not in the sources read | 106.4 mph Top speed, GTR4 Several figures in print.
| Not in the sources read |
| 0–60 mph | 10.1 s 0–60 mph, TR4 Several figures in print.
| Not in the sources read | Not in the sources read | Not in the sources read | Not in the sources read |
| Standing start | 17.5 s Standing start, TR4 Several figures in print.
| Not in the sources read | Not in the sources read | 18.4 s | Not in the sources read |
Running gear
Sources for Running gear, by version
- Steering
- TR4: One good source.Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6; Gordon Wilkins, "Report: New Triumph TR-4", Motor Trend, Dec 1961, pp. 64–66source 3
- TR4A IRS: One good source.TR4 and TR4A. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4 and TR4A. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Gearbox
- TR4: One good source.Dennis May, "Technical Report" on the TR-4 (cover story), Car and Driver, Oct 1961, pp. 19–23source 2
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Gears
- TR4: One good source.Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Overdrive
- TR4: Several figures in print.Dennis May, "Technical Report" on the TR-4 (cover story), Car and Driver, Oct 1961, pp. 19–23source 2; Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A IRS: One good source.Optional; TR4 and TR4A. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.Optional; TR4 and TR4A. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.Optional extra, £51 7s 1d. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- Layout
- TR4: One good source.Gordon Wilkins, "Report: New Triumph TR-4", Motor Trend, Dec 1961, pp. 64–66source 3
- TR4A IRS: One good source.TR4A IRS. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- TR4A (solid axle): One good source.Live-axle TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Front brakes
- TR4: Good sources agree.Car and Driver data. Triumph Sports Owners Association, Triumph Sports Owners Association Newsletter, April 1964, Apr 1964 (vol. 10 no. 4)source 16; G. William Krause, The Illustrated History of Triumph Sports and Racing Cars, CarTech, 2017source 10
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Rear brakes
- TR4: Good sources agree.Car and Driver data. Triumph Sports Owners Association, Triumph Sports Owners Association Newsletter, April 1964, Apr 1964 (vol. 10 no. 4)source 16; Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Front suspension
- TR4: Several figures in print.Gordon Wilkins, "Report: New Triumph TR-4", Motor Trend, Dec 1961, pp. 64–66source 3; Triumph Sports Owners Association, Triumph Sports Owners Association Newsletter, April 1964, Apr 1964 (vol. 10 no. 4)source 16; Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Rear suspension
- TR4: One good source.Dennis May, "Technical Report" on the TR-4 (cover story), Car and Driver, Oct 1961, pp. 19–23source 2
- TR4A IRS: Several figures in print.Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11; G. William Krause, The Illustrated History of Triumph Sports and Racing Cars, CarTech, 2017source 10
- TR4A (solid axle): Several figures in print.Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11; TR Register, "Triumph TR4 / TR4A Buyers Guide"source 19
- GTR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- Tyres
- TR4: Several figures in print.Motor Sport, "The Triumph TR4: a rugged British sports car", with the data panel "The Triumph TR4 hard-top", Jan 1963, pp. 9–10source 4; TR Drivers Club, "Early Cars: The TR4"source 9
- TR4A IRS: Several figures in print.Vintage Triumph Register, "TR4A" (history, change points and yearly output, buyer's and spotter's guides, numbering)source 8; Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1
- TR4A (solid axle): One good source.TR4A. Vintage Triumph Register, "TR4A" (history, change points and yearly output, buyer's and spotter's guides, numbering)source 8
- Wheels
- TR4: Several figures in print.Motor Sport, "The Triumph TR4: a rugged British sports car", with the data panel "The Triumph TR4 hard-top", Jan 1963, pp. 9–10source 4; TR Drivers Club, "Early Cars: The TR4"source 9; Arthur Kelly (the VTR's TR4 consultant), "TR4": "A Historical Overview of the TR4" and the TR4 commission-number page, Vintage Triumph Registersource 18
- TR4A IRS: One good source.TR4A. Vintage Triumph Register, "TR4A" (history, change points and yearly output, buyer's and spotter's guides, numbering)source 8
- TR4A (solid axle): One good source.TR4A. Vintage Triumph Register, "TR4A" (history, change points and yearly output, buyer's and spotter's guides, numbering)source 8
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Final drive
- TR4: One good source.Gordon Wilkins, "Report: New Triumph TR-4", Motor Trend, Dec 1961, pp. 64–66source 3
- TR4A IRS: One good source.TR4A IRS. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- TR4A (solid axle): One good source.Live-axle TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Clutch
- TR4: One good source.Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
| Item | TR4 | TR4A IRS | TR4A (solid axle) | GTR4 | GTR4A |
|---|---|---|---|---|---|
| Steering | rack and pinion | rack and pinion | rack and pinion | Alford and Alder rack and pinion | rack and pinion |
| Gearbox | Manual | Manual | Manual | Manual | Manual |
| Gears | 4 | 4 | 4 | 4 | 4 |
| Overdrive | Laycock de Normanville, on 2nd, 3rd and top Overdrive, TR4 Several figures in print.
| A-type, on 2nd to 4th | A-type, on 2nd to 4th | overdrive in "each of the three upper gears" (O/D 2nd, O/D 3rd, O/D top timed) | Not in the sources read |
| Layout | RWD | RWD | RWD | RWD | RWD |
| Front brakes | 11 in discs | Disc, 11 in | Disc, 11 in | 11 in discs | Disc, 11 in |
| Rear brakes | 9 in drums | Drum, 9 in | Drum, 9 in | Drum, 9 in | Drum, 9 in |
| Front suspension | unequal-length double wishbones and coil springs at the front Front suspension, TR4 Several figures in print.
| Independent, double wishbones, coil springs, telescopic dampers | Independent, double wishbones, coil springs, telescopic dampers | independent front suspension by wishbones and coil springs, as the TR4 | Independent, double wishbones, coil springs, telescopic dampers |
| Rear suspension | live axle, semi-elliptic leaf springs, lever-arm dampers | semi-trailing "big aluminum" arms, coil springs, lever-arm dampers Rear suspension, TR4A IRS Several figures in print.
| live axle on half-elliptic leaf springs, on brackets added to the new TR4A frame Rear suspension, TR4A (solid axle) Several figures in print.
| live rear axle on semi-elliptic leaf springs, as the TR4 | Not in the sources read |
| Tyres | 5.90 x 15 Tyres, TR4 Several figures in print.
| cross-plies (5.50/5.90-15) as standard; most cars on radials, usually Michelin X 165-15 Tyres, TR4A IRS Several figures in print.
| cross-plies (5.50/5.90-15) as standard; most cars on radials, usually Michelin X 165-15 | Not in the sources read | Not in the sources read |
| Wheels | 15 x 4½ disc Wheels, TR4 Several figures in print.
| 4½J x 15 pressed steel; 60-spoke wire wheels optional | 4½J x 15 pressed steel; 60-spoke wire wheels optional | Not in the sources read | 15 x 4.5 in |
| Final drive | Shaft | Shaft | Shaft | Not in the sources read | Shaft |
| Clutch | single dry plate, hydraulic | Dry single plate | Dry single plate | single dry plate, as the TR4 | Dry single plate |
Body and chassis
Sources for Body and chassis, by version
- Body
- TR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Body material
- TR4: One good source.Dennis May, "Technical Report" on the TR-4 (cover story), Car and Driver, Oct 1961, pp. 19–23source 2
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Panels
- GTR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Seats
- TR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- TR4A IRS: One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A section. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Chassis material
- TR4: One good source.Dennis May, "Technical Report" on the TR-4 (cover story), Car and Driver, Oct 1961, pp. 19–23source 2
- TR4A IRS: One good source.The TR4A frame. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.The TR4A frame. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.The Dové GTR4 on the TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
| Item | TR4 | TR4A IRS | TR4A (solid axle) | GTR4 | GTR4A |
|---|---|---|---|---|---|
| Body | Roadster | Roadster | Roadster | Coupe | Coupe |
| Body material | Steel | Steel | Steel | steel and glass fibre | Steel |
| Panels | Not in the sources read | Not in the sources read | Not in the sources read | steel and glass fibre | Steel and fibreglass |
| Seats | 2 | 2 | 2 | 4 | 4 |
| Chassis material | Steel | Steel | Steel | Steel | Steel |
Dimensions and weight
Sources for Dimensions and weight, by version
- Length
- TR4: Several figures in print.Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11; Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6; Bill Boddy ("W. B."), "The new Triumph TR4", Motor Sport, Sep 1961, p. 17source 15; Gordon Wilkins, "Report: New Triumph TR-4", Motor Trend, Dec 1961, pp. 64–66source 3
- TR4A IRS: One good source.TR4A. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- Width
- TR4: Several figures in print.Gordon Wilkins, "Report: New Triumph TR-4", Motor Trend, Dec 1961, pp. 64–66source 3; Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6; Motor Sport, "The Triumph TR4: a rugged British sports car", with the data panel "The Triumph TR4 hard-top", Jan 1963, pp. 9–10source 4
- TR4A IRS: One good source.TR4A. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Height
- TR4: Several figures in print.Gordon Wilkins, "Report: New Triumph TR-4", Motor Trend, Dec 1961, pp. 64–66source 3; Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6; Motor Sport, "The Triumph TR4: a rugged British sports car", with the data panel "The Triumph TR4 hard-top", Jan 1963, pp. 9–10source 4
- TR4A IRS: One good source.TR4A. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- Kerb weight
- TR4: Several figures in print.Gordon Wilkins, "Report: New Triumph TR-4", Motor Trend, Dec 1961, pp. 64–66source 3; Motor Sport, "The Triumph TR4: a rugged British sports car", with the data panel "The Triumph TR4 hard-top", Jan 1963, pp. 9–10source 4; Triumph Sports Owners Association, Triumph Sports Owners Association Newsletter, April 1964, Apr 1964 (vol. 10 no. 4)source 16; Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A IRS: Several figures in print.G. William Krause, The Illustrated History of Triumph Sports and Racing Cars, CarTech, 2017source 10; Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.Live-axle car. G. William Krause, The Illustrated History of Triumph Sports and Racing Cars, CarTech, 2017source 10
- GTR4: One good source.Kerb, with oil, water and half-full fuel tank ("2,660lb–1,205kg"); 4 cwt more than the open TR4. Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- Wheelbase
- TR4: Several figures in print.Gordon Wilkins, "Report: New Triumph TR-4", Motor Trend, Dec 1961, pp. 64–66source 3; Bill Boddy ("W. B."), "The new Triumph TR4", Motor Sport, Sep 1961, p. 17source 15; Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A IRS: One good source.TR4A. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- TR4A (solid axle): One good source.TR4A. Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF)source 6
- GTR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Ground clearance
- TR4: One good source.Gordon Wilkins, "Report: New Triumph TR-4", Motor Trend, Dec 1961, pp. 64–66source 3
- GTR4: One good source.Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5
- Fuel tank
- TR4: Several figures in print.Bill Boddy ("W. B."), "The new Triumph TR4", Motor Sport, Sep 1961, p. 17source 15; Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1
- TR4A IRS: One good source.TR4 and TR4A. Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1
- TR4A (solid axle): One good source.TR4 and TR4A. Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1source 1
- GTR4: Good sources agree."increased from the 11·75 gallons of the standard model". Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997source 5; Steve Dival, "The Dove GTR4", TR Drivers Clubsource 23
- GTR4A: One good source.Dové on the TR4A. Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012source 11
- Dry weight
- TR4: One good source.Dry, factory figure (OCR). Triumph Sports Owners Association, Triumph Sports Owners Association Newsletter, September 1961 (TR-4 special issue), Sep 1961 (vol. VII no. 9)source 17; G. William Krause, The Illustrated History of Triumph Sports and Racing Cars, CarTech, 2017source 10
| Item | TR4 | TR4A IRS | TR4A (solid axle) | GTR4 | GTR4A |
|---|---|---|---|---|---|
| Length | 153.6 in Length, TR4 Several figures in print.
| 391.0 cm | 391.0 cm | 13 ft 0 in | Not in the sources read |
| Width | 57.5 in Width, TR4 Several figures in print.
| 147.0 cm | 147.0 cm | 4 ft 9½ in | 147 cm |
| Height | 50 in Height, TR4 Several figures in print.
| 127.0 cm | 127.0 cm | 4 ft 4 in | Not in the sources read |
| Kerb weight | 2240 lb Kerb weight, TR4 Several figures in print.
| nearly 2,240 lb Kerb weight, TR4A IRS Several figures in print.
| 2211 lb | 23.75 cwt | Not in the sources read |
| Wheelbase | 88 in Wheelbase, TR4 Several figures in print.
| 223.5 cm | 223.5 cm | 7 ft 4 in | 223.5 cm |
| Ground clearance | 6 in | Not in the sources read | Not in the sources read | 6 in | Not in the sources read |
| Fuel tank | 11.75 gal Fuel tank, TR4 Several figures in print.
| 11.75 gal | 11.75 gal | 15 gal | 15 gal |
| Dry weight | 2128 lb | Not in the sources read | Not in the sources read | Not in the sources read | Not in the sources read |
Sources
Every source the site cites is on the sources page.
- Primarymade at the time, by the maker or by people who were there
- Referenceserious later work: clubs, specialists, magazines, books
- Graham Robson (essay "15 Years of Evolution"), Triumph TR2 – TR3/3A, TR4/4A – TR5, TR250 1953–1968 Parts & Accessories Catalogue, Rimmer Bros, edn 2.1 (source code TR2512), Part 1, p. 5, Robson's essay: the TR4A's new frame; p. 8, service data: the spark-plug gap and idle speeds; p. 8, gearbox and axle oil; p. 8, tyre pressures; p. 8, axle oil; p. 7, "Vehicle Identification"; p. 5, Robson, "15 Years of Evolution"; pp. 5-6, Robson, basic summaries; p. 6, "TR Production Figures: 1953 to 1968"; p. 8, "Service Information". rimmerbros.com/images/PDFs/TR2-5_Part1.pdf Reference
- Dennis May, "Technical Report" on the TR-4 (cover story), Car and Driver, Oct 1961, pp. 19–23, pp. 19–23, the TR4's engineering; pp. 19–21: wet liners, nickel-chrome iron, centrifugally cast; the 2-litre engine; the low-compression head; the gearbox and overdrive; the steering column; the tracks; the rear dampers; leathercloth standard, leather an option; pp. 19-23, "Technical Report"; p. 21; pp. 19-23, options; p. 22. Primary
- Gordon Wilkins, "Report: New Triumph TR-4", Motor Trend, Dec 1961, pp. 64–66, pp. 64–66, data; p. 65, net and gross; the turning circle; "telescopic dampers" at the rear; p. 65, the weight with fuel, oil and water; dimensions; pp. 65–66: the one-way run; 0–50 mph; 30–50 mph in top; p. 65, specifications; p. 65, performance; p. 65; p. 65, dimensions. Primary
- Motor Sport, "The Triumph TR4: a rugged British sports car", with the data panel "The Triumph TR4 hard-top", Jan 1963, pp. 9–10, data panel; data panel, the carburettors; text (net) and data panel (gross); data panel: overall ratios in overdrive, on the standard axle; data panel, turns lock to lock; data panel, kerb weight of the hardtop car; the "absolute" top speed; 0–70 mph; pp. 9-10, text and data panel; p. 10, data panel; p. 9, text. motorsportmagazine.com/archive/article/january-1963/9/the-triumpth-tr4 Primary
- Autocar, "Dové GTR4 2,138 c.c." (Road Test No. 1926), 7 Jun 1963, pp. 993–997, data panel; data panel: the standard axle with overdrive; the open TR4 of January 1962; data panel and text: the tank, the weight, the roof; price table; p. 996, text; p. 997, text; p. 993, title; text; p. 995, text; p. 994, data panel; p. 993, text; p. 997, specification panel; pp. 994-995; specification panel. Primary
- Bruno Dwinger, "Geschichte, Typenkunde und Kaufberatung: Standard-Triumph TR4, TR5/TR250 – 'die Michelotti Autos'", TR-Register Deutschland, 2009, 13 pp. (PDF), pp. 3–5, the data tables; p. 3, layout and bearings; p. 11, the thermostat; pp. 3–4, torque printed in Nm; the TR4A's peak at 4,700 rpm; p. 4: overdrive; clutch; the optional axle; p. 4: the frames; the front suspension; the tracks of the TR4 and both TR4As; p. 4, kerb weights of the TR4 and TR4A; p. 4, the rear tracks; p. 4; pp. 3-4; pp. 4, 11. tr-register.de/wp-content/uploads/2025/08/Kaufberatung-TR4-und-TR5-und-TR250.pdf Reference
- TR Drivers Club, "Triumph TR4", the Stromberg change; the tracks; Girling 16P calipers from CT4388 and CT4690; Stromberg change. trdrivers.com/articles21/triumphtr4.html Reference
- Vintage Triumph Register, "TR4A" (history, change points and yearly output, buyer's and spotter's guides, numbering), SU and Stromberg on the TR4A; the CTA engine prefix; the live-axle cars: leaf springs on the new frame; TR4A page, spotter's guide; TR4A page. vintagetriumphregister.org/tr4a Reference
- TR Drivers Club, "Early Cars: The TR4", the gross figure at the net figure's engine speed; TR4 data; TR4 page. trdrivers.com/earlycars/tr4.html Reference
- G. William Krause, The Illustrated History of Triumph Sports and Racing Cars, CarTech, 2017, p. 53, the same; p. 59, the TR4A's two weights; p. 59, the live-axle car's weight; ch. 3, p. 53; ch. 3, p. 52; ch. 3, pp. 57, 59; ch. 3, p. 59. static.summitracing.com/global/images/technicalarticles/sad-ct596.pdf Reference
- Aaron Severson, "Grandfather's Ax: The Many Evolutions of the Triumph TR4, Part 1: TR4 and TR4A", Ate Up With Motor, 22 Oct 2012, the TR4A's net and gross ratings; the optional axle with overdrive; the TR4A's steering and rear suspension; the factory length and the tests' longer one; the TR4A 112 lb heavier; "The Triumph TR4"; Dové sidebar; "The Independent TR4"; engine photo caption; photo caption. ateupwithmotor.com/model-histories/triumph-tr4-tr4a/view-all Reference
- TR Drivers Club, "Early Cars: The TR4A", the TR4A's power peak; TR4A page. trdrivers.com/earlycars/tr4A.html Reference
- Triumph Sports Owners Association, Triumph Sports Owners Association Newsletter, March 1965, Mar 1965 (vol. 11 no. 3), the TR4A's diaphragm clutch; "telescopic shocks" on the TR4A; the American TR4A's leather and carpet. vintagetriumphregister.org/tsoa/TSOA0365.pdf Primary
- Gregor Grant, "The Triumph TR4", Autosport, 14 Sep 1962, pp. 359–362, the turning circle; pp. 359-362 (OCR). porschecarshistory.com/wp-content/old/lib/magazines/autosport/1962/AS1962.09.14.pdf Primary
- Bill Boddy ("W. B."), "The new Triumph TR4", Motor Sport, Sep 1961, p. 17, p. 17, turns lock to lock; p. 17, the makers' claims; p. 17. motorsportmagazine.com/archive/article/september-1961/17/the-new-triumph-tr4 Primary
- Triumph Sports Owners Association, Triumph Sports Owners Association Newsletter, April 1964, Apr 1964 (vol. 10 no. 4), Car and Driver data, weight and its distribution; Car and Driver data, 1964; p. 2, data panel. vintagetriumphregister.org/tsoa/TSOA0464.pdf Primary
- Triumph Sports Owners Association, Triumph Sports Owners Association Newsletter, September 1961 (TR-4 special issue), Sep 1961 (vol. VII no. 9), the factory's dry weight; the American launch colours; TR4 special issue, specification. vintagetriumphregister.org/tsoa/TSOASep61.pdf Primary
- Arthur Kelly (the VTR's TR4 consultant), "TR4": "A Historical Overview of the TR4" and the TR4 commission-number page, Vintage Triumph Register, the gross laden weight on the commission plate; Road & Track's 1962 figures; the TR4's colours; codes on the plate from 1963; the floor coverings; "A Historical Overview of the TR4", text; commission-number table; TR4 page, performance; TR4 page, Brakes/Wheels tab. vintagetriumphregister.org/tr4 Reference
- TR Register, "Triumph TR4 / TR4A Buyers Guide", the unnamed set; TR4 model summary; TR4A data; TR4 data; TR4 page, performance table; TR4A model summary. tr-register.co.uk/resources/buyers-guide/triumph-tr4-4a Reference
- Motor Sport, "Cornering fast in a Triumph TR4A…" (Standard-Triumph advertisement, with price list), May 1966, p. 49, p. 49, the TR4A's claims; p. 49. motorsportmagazine.com/archive/article/may-1966/49/1-cornering-fast-in-a-triumph-tr4a-youre-glad-of-2 Primary
- Revington TR, "TR4A: Technical Specification Change Points", the cross-box exhaust from about CT70000. revingtontr.com/the-tr-series/tr4a/technical-specification-change-points Reference
- John Bolster, "The Dové GTR4", Autosport, 12 Jul 1963, pp. 59–60, the tank doubted; the claimed weight; the roof's height. porschecarshistory.com/wp-content/old/lib/magazines/autosport/1963/AS1963.07.12.pdf Primary
- Steve Dival, "The Dove GTR4", TR Drivers Club, the tank; article. trdrivers.com/articles21/thedovegtr4.html Reference
- Rimmer Bros, "Triumph Paint & Trim Identification Codes", the code system and the trim prefixes. rimmerbros.com/c/Triumph-Paint-Information Reference
- Motor Sport, "Matters Of Moment, November 1962", Nov 1962, p. 9, p. 9. motorsportmagazine.com/archive/article/november-1962/9/matters-of-moment-november-1962 Primary
- Graham Robson, "One Design, Many Derivatives", Moss Motoring, 26 Oct 2022, Robson, "One Design, Many Derivatives", prices. mossmotoring.com Reference
- Ian Nicholls, "The Rover-Triumph story": "1960: expansion" and "1961: Leyland's takeover", AROnline, 7 Jul 2019, "1961: Leyland's takeover". aronline.co.uk/history/the-rover-triumph-story/1960-expansion Reference
- Revington TR, "TR4", TR4 page. revingtontr.com/the-tr-series/tr4 Reference
- Revington TR, "TR4: Technical Specification Change Points", change-point list. revingtontr.com/the-tr-series/tr4/technical-specification-change-points Reference
- Motor Sport, "Matters of moment, April 1965", Apr 1965, p. 11, p. 11. motorsportmagazine.com/archive/article/april-1965/11/matters-of-moment-april-1965 Primary