Triumph Car Engines – TR2 engine, TR3, TR4

Published by Carl Wilson on

Triumph car logo

The Triumph Motor Company had its origins in 1885 when Siegfried Bettmann (1863-1951) and Moritz (Maurice) Schulte founded Bettmann & Co. Triumph car engines are obtainable at Engines and Gearboxes as used, reconditioned or secondhand and are 100% guaranteed.


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The Triumph Slant-4 is an engine developed by Triumph. The UK engineering and consultancy company Ricardo, which did have a general engine-development contract with Triumph, was not directly involved with its design, but was usually kept informed of anything new being planned.

Ricardo was involved in developing a new engine for Saab, as a replacement for their aging two-stroke units. When that development proved too expensive and risky to produce, Ricardo, knowing the Slant-4 was almost ready for production, brought Saab into contact with Triumph.

Saab first used the Triumph Slant-4 at 1.7 L (1709 cc) for the Saab 99. Only later, as production capacity increased, did it become available in Triumphs. Development continued into the 1990s. The engine is a straight-4 with the cylinders tilted at 45 degrees (actually a half Triumph V8).


Variants of the design were also used in the Triumph Dolomite 1850 and Sprint, early Triumph Stag, Triumph TR7 and Panther Rio (1975-1977).

Triumph Sprint

Triumph Motor Company added unique SOHC 4-valve cylinder heads to the Slant-4 for 1973’s Dolomite Sprint. This is regarded as the first mass-produced multi-valve engine.

The Multi-Valve

In automotive engineering, an engine is referred to as multi-valve (or multivalve) when each cylinder has more than two valves.
All poppet valve, four-stroke internal combustion engines have at least two valves per cylinder — one for intake of air and fuel, and another for exhaust of combustion products.

Adding more valves improves the flow of intake and exhaust gases, potentially improving combustion efficiency, power, and performance. It is not practical to simply use two larger valves because of the circular shape of the combustion chamber and the need for valves to also be round, which ensures they can only cover a fraction of the top of each cylinder; three (or more) smaller valves can replace the largest two valves which could be fitted into the space and result in having a greater effective valve area.

Adding more valves per cylinder can improve breathing and thus allow an engine to run at a higher RPM, creating more power for a given displacement, though at a greater complexity and cost.

Triumph Car Engines


Most multivalve engines use an overhead camshaft to actuate the valves, and many use double overhead camshafts (DOHC). However this is not always the case: Chevrolet recently showed a 3-valve version of its Generation IV V8 which uses pushrods to actuate forked rockers, and Cummins makes a 4-valve pushrod straight-6 Diesel, the Cummins 600.

Other Triumph models are the: Herald, Spitfire, Vitesse, GT6, Stag, TR2, TR3, TR4, TR4A, TR5, TR6, TR7, Toledo, 1300,1500, 2000, 2.5 & 2500, Dolomite, Acclaim.
Vanden Plas models: Princess, 3-Litre 1100/1300

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Carl Wilson

You won't believe it, I'm native Scotsman. Enthusiast. Car lovers. Almost finished rebuilding my Reliant Saber 🔥

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