1977 Triumph Stag – 

This Triumph car was manufactured in 1977 and has received a full body restoration and bare metal re-spray, retaining the original Triumph engine. It is a Rally Prize winner.

The initial Stag design used the saloon’s 2.0-litre six-cylinder engine, which was intended to be upgraded to 2.5 litres for production cars. However, Triumph intended the Stag, large saloons, and estate cars to be powered by a new Triumph-designed overhead cam (OHC) 2.5-litre fuel-injected (PI) V8 engine. In 1968, the new 2.5 PI V8 had grown to 2,997 cc – or 183 cubic inches, increasing the power.

Among the challenges in developing the Stag engine was meeting emission standards in the US, a crucial target market. To overcome this, the troublesome mechanical fuel injection was replaced with dual Zenith-Stromberg 175 CDSE carburettors. Triumph’s engineering strategy at the time was to create a family of in-line and V engines of different sizes around a common crankshaft. This innovative approach allowed for the production of four-six and eight-cylinder engines with a capacity from 1.5 to 4 litres, sharing many parts and offering economies of manufacturing scale and mechanic training.

The design of the Stag engine went through several iterations before reaching its final form. These iterations included a 2.0-litre slant four-cylinder engine used in the later Dolomite and TR7 and a variant manufactured by StanPart that was initially used in the Saab 99. In 1968, the Saab variant became the first of these engines to be fitted to a production car, followed by the Stag V8 in 1970. The Stag V8, sometimes described as two four-cylinder engines siamese together, was a new and imaginative design, with the four-cylinder versions being the left half of a Stag engine.

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