page_title: Cosworth
section_title: The DFV (Double Four Valve)
hierarchical_section_title: Cosworth / Engines / The DFV (Double Four Valve)
caption_attribution_description: F1 Lotus 49 (early version)
context_page_description: Cosworth is a high performance engineering company. It was founded in London in 1958. It builds engines and electronics for automobile racing, mainstream automotive and defence industries. Cosworth is based in Northampton, England. It has North American facilities in Torrance, California; Indianapolis, Indiana; and Mooresville, North Carolina. It also has a facility in Pune, India.
  Cosworth has had a long and well respected career in Formula One, beginning in 1963. Cosworth stepped away from Formula One for three years when no team decided to use their engines for 2007. Cosworth returned to F1 in 2010, suppling engines to Williams, HST, Lotus, and Virgin. The first Formula One engines shipped in January. Cosworth's 176 wins make it the second most successful engine manufacturers in F1, after Ferrari.
context_section_description: In 1966, Colin Chapman of Lotus Cars was the founder and principal of Team Lotus. He got Ford to finance Keith Duckworth's design for a new lightweight 3.0 litre Formula One engine. Cosworth received the order along with £100,000 from Ford. The contract told Duckworth to build a four-cylinder Ford-based F2 engine to prove it would work (see the FVA above). After that, a pure Cosworth V8 would be built. The DFV design used a similar cylinder head to the one on the FVA engine with custom cylinder block and crankcase. This created the legendary DFV - literally meaning "Double Four Valve". This engine, and its version were used for a quarter of a century. It was the most successful engine in the history of Formula One / Grand Prix motor racing.  With 167 winning races it put Cosworth Engineering on the map. Although designed for Formula One, the engine has been modified for use in many other areas.
  The DFV won on its first outing, at the 1967 Dutch Grand Prix. Jim Clark drove a Lotus 49 with the DFV engine. Starting in 1968, any F1 team could purchase the engine. During the 1970s, it was common for almost the entire field to use one of the DFV engines. Ferrari never used a Cosworth engine. Most teams just built a car around a Cosworth DFV and a Hewland gearbox. It won a record 155 World Championship races. The last was the Detroit Grand Prix in 1983 in a Tyrrell driven by Michele Alboreto.
  The DFV with 410 horsepower did not produce as much power as some of its rival 12-cylinder engines. It was lighter, resulting in a better power to weight ratio. It was also a structural part of the car.
  The DFY, introduced in 1982 was upgrade of the DFV for Formula One with 520 horsepower. While it produced more power, it no match for the turbocharged cars of the day. It was the advent of turbocharged engines which ended the use of the DFY. In 1986 Cosworth returned to the lower levels of racing. They modified the DFV for the newly created Formula 3000. The DFV remained in F3000 until 1992.
  In Formula One, a new DFV-based design was introduced for the new rules in 1987. 3.5 litre normally-aspirated (non-turbocharded) engines were allowed. In 1988 Cosworth built the DFR, which was used in F1 by the smaller teams until 1991. It scored its last points in 1990.
  The DFV is still being used in Classic F1 racing. The FIA given them World Championship status in 2004.
caption: A Ford-Cosworth DFV installed in the back of a Lotus 49
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