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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.〔The Power and the Glory: A Century of Motor Racing by Ivan Rendall Published 1991 BBC Books ISBN 0-563-36093-3〕 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 86 x 65 mm (3.373 x 2.555 in) producing over 400 bhp (408 bhp at 9,000 rpm, 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, torque at 8,500 rpm. ==Background== In 1965, the Fédération Internationale de l'Automobile, that administered Formula One racing, agreed to raise the series' maximum engine capacity from to 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.〔 Chapman approached the Ford Motor Company and David Brown of Aston Martin for funding, each without initial success. Chapman then approached Ford of Britain's public relations chief, former journalist Walter Hayes, with whom he had developed a close working relationship from the early 1960s. Since Hayes had joined Ford in 1962 the pair had already collaborated in the production of the successful Lotus Cortina, introduced in 1963. Hayes arranged dinner for Chapman with Ford employee Harley Copp, a British-based American engineer who had backed and engineered Ford's successful entry into NASCAR in the 1950s.〔 Hayes and Copp developed a business plan, which was backed by Ford UK's new chairman Stanley Gillen, and approved by Ford's Detroit head office as a two-part plan: *Stage one would produce a four-cylinder twin-cam engine for Formula Two. *Stage two would produce a V8 engine for Formula One, by May 1967. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cosworth DFV」の詳細全文を読む スポンサード リンク
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