Editing Cosworth (section)

====DFV variants====
The DFV spawned a number of derivations. In 1968; Cosworth created the DFV's first derivation, a {{convert|2500|cc|1|lk=on}} version for the [[Tasman Series]], the '''DFW'''. DFV to DFW conversion simply involved substitution of a short-stroke crank and longer connecting rods.

[[File:Cosworth DFX engine.jpg|thumb|left|200px|Cosworth DFX]]
[[File:CosworthDFSV8engine.JPG|thumb|right|200px|Cosworth DFS]]
One of the most successful and longest-lived projects of Cosworth has been its [[Champ Car|CART]] / [[Champ Car]] engine programme. In 1975; Cosworth developed the '''DFX''', by destroking the engine to {{convert|2650|cc|1|abbr=on}} and adding a [[turbocharger]], the DFX became the standard engine to run in [[United States Automobile Club|IndyCar]] racing, ending the reign of the [[Offenhauser]], and maintaining that position until the late 1980s. Ford backed Cosworth with creating a new interim design for IndyCar racing in the late 1980s, the '''DFS''', which merged DFR technology into the ageing DFX design, but it was eventually rendered obsolete by advancing technology.

While designed as an F1 engine, the DFV was also used as in endurance racing, although its flat-plane crank design led to destructive vibrations putting stress on devices surrounding the engine, especially the exhaust system. The first sports car to use a DFV, the [[Ford P68]], failed to finish a single race because of repeated mechanical and electrical failures. Despite this handicap the DFV won the [[24 Hours of Le Mans]] twice in its original 3.0 Litre form for Mirage in 1975 and Rondeau in 1980, who were able to attain sufficient reliability by de-tuning the motor.

The '''DFL''' for endurance racing was developed for the 1982 season to replace the DFV. It came in two versions: one with {{convert|3298|cc|1|abbr=on}} and the other with {{convert|3955|cc|1|abbr=on}}. While neither competed well in the [[Group C]] (C1 Class) the former was adapted to the C2 Class (700&nbsp;kg minimum weight, 55 Litres fuel, 5 refuelings/1000&nbsp;km) starting in 1984. During the latter half of the 1980s it was the most popular motor for that class, with successful championship campaigns and five class wins at the 24 Hours of Le Mans. The latter version's severe lack of reliability caused it to fall out of use by 1985.

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