Triumph slant-four engine

The Triumph slant-four is an inline four-cylinder petrol car engine developed by the Triumph Motor Company. It first appeared in 1968 in the Saab 99, which Triumph supplied under contract, and the first Triumph car to use it was the Dolomite 1850 of 1972. Its cast-iron block carries the cylinders inclined at 45 degrees, so that the same tooling could also build a V8, and the aluminium head has a single overhead camshaft driven by a chain and two valves per cylinder. Displacement grew from 1.7 litres to 2.0 litres. A unique 16-valve head was added for the Dolomite Sprint of 1973, described as the first mass-produced multi-valve car engine. The engine also powered the TR7 until production ended in 1981, and Saab later built its own development as the Saab B engine.