- Wet-liner four
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Stroke is 92mm in every car version; capacity is set by the bore. 83mm = 1,991cc TR2, TR3, TR3A · 85mm = 2,088cc Standard Vanguard · 86mm = 2,138cc TR3B, TR4, TR4A and the Standard Ensign De Luxe. Liners and pistons are bore-specific — this is the biggest crossover trap in the range.
- Standard SC four
- 803cc Standard Eight · 948cc Standard Ten, Pennant, Herald 948 · 1,147cc Herald 1200 and 12/50, Spitfire Mk1 and Mk2 · 1,296cc Herald 13/60, Spitfire Mk3 and Mk4, Triumph 1300, Toledo, Dolomite 1300 · 1,493cc Triumph 1500, Toledo, Dolomite 1500, Spitfire 1500 — and the MG Midget 1500.
- Straight six
- The SC with two cylinders added. 1,998cc Standard Vanguard Six, Triumph 2000, Vitesse 2-litre, GT6 · 2,498cc for the TR5, TR250, TR6 and 2.5 PI — a longer stroke, 76mm to 95mm, on the same bore. That is why ancillaries cross so freely and bottom-end parts do not. 1,596cc in the Vitesse 6.
- Slant four
- 1,854cc Dolomite 1850 · 1,998cc Dolomite Sprint (16-valve) and TR7. Also the Saab 99, which had it before Triumph did.
- Triumph V8
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2,997cc, Stag only. Cast-iron block, alloy heads, single overhead camshaft per bank. Not the Rover V8, which is an all-alloy pushrod 3.5 from Buick.
- Front disc brakes, when
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TR3 from commission number TS13046, late 1956 — the first British series-production car with them as standard. Herald: optional from October 1961, standard from the 12/50 in 1963. Spitfire: standard from the Mk I. Vitesse: standard on every one. No TR2 ever left the factory with discs.
- The three rear-suspension fixes
- Triumph solved the swing-axle problem three different ways and the parts do not cross: Vitesse Mk2 and GT6 Mk2, 1968 — reversed lower wishbones and Rotoflex couplings · Spitfire Mk IV, November 1970 — the cheaper swing spring · GT6 Mk3, 1973 — switched from Rotoflex to swing spring near the end of the run.
- Built here
- Christchurch, Tuam Street, from 1954; equipment moved to Nelson in August 1965. Triumph 2000 and 2500 assembled at Nelson October 1965 to 1979 — 29,903 cars, nine per cent of world production. Nelson later assembled Honda and closed in August 1998.
- Earth polarity
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TR4 and TR4A are positive earth; TR250, TR5 and TR6 are negative. The change falls at the four-to-six-cylinder switch in mid-1967. For every other Triumph, check your own car — it is not documented and conversions are common.
- Sister marque
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Standard. One company from 1945, and the wet-liner four, the SC four and the straight six all started life as Standard engines.