Cosworth DFV

The DFV is an internal combustion engine that was originally produced by Cosworth for Formula One motor racing. Named Four Valve because of the four valves per cylinder, and Double as it was a V8 development of the earlier, four-cylinder FVA (four valve type A engine), making it a Double Four Valve engine.

Its development in 1967 for Colin Chapman's Team Lotus was sponsored by Ford. For many years it was the dominant engine in Formula One, and it was also used in other categories, including CART, Formula 3000 and Sportscar racing.

The engine was a 90°, 2,993 cc V8, with bore & stroke of 85.67 x 64.897 mm (3.373 x 2.555 in) producing over 400 bhp (408 bhp at 9,000 rpm, 270 ft·lbf (370 N·m) torque at 7,000 rpm was quoted) from the start, reaching over 500 bhp (510 bhp at 11,200 rpm was quoted) by the end of its Formula 1 career. The 1983 DFY variant had a revised bore and stroke of 90 x 59 mm (3.543 x 2.316 in) giving 2,993 cc and 520–530 bhp at 11,000 rpm, 280 ft·lbf (380 N·m) torque at 8,500 rpm.

In 1965, the Fédération Internationale de l'Automobile, that administered Formula One racing, agreed to raise the series' maximum engine capacity from 1.5 litres (92 cu in) to 3.0 litres (183 cu in) from 1966. Up until that point, Colin Chapman's successful Team Lotus cars had relied on power from fast revving Coventry Climax engines, but with the change in regulations Coventry Climax decided for business reasons not to develop a large capacity engine.

Chapman approached Keith Duckworth, previously a gearbox engineer at Lotus but now running his fledgling Cosworth company with Mike Costin, who commented that he could produce a competitive three-litre engine, given a development budget of £100,000.

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