Editing Cosworth DFV (section)

===DFL===
{{Infobox automobile engine
| name = [[Cosworth]] DFL<ref>{{cite web |url=http://tech-racingcars.wikidot.com/cosworth-dfl-evolution |title = Cosworth DFL Evolution (1981) - Racing Cars}}</ref><ref>{{cite web |url=http://tech-racingcars.wikidot.com/cosworth-dfl |title = Cosworth DFL (1981) - Racing Cars}}</ref><ref>{{Cite web|url=https://books.google.com/books?id=-uMDAAAAMBAJ&dq=ford+c100+group+c+engine+specs&pg=PA160|title = Popular Mechanics|date = January 1986|publisher = Hearst Magazines}}</ref>
| image = 
| manufacturer = {{flagicon|UK}} [[Ford Motor Company|Ford]]-[[Cosworth]]
| production = 1981–1984
| configuration = [[V8 engine|V8]], [[naturally aspirated|naturally-aspirated]], 90° cylinder angle
| displacement = {{cvt|3954.4|cc|L|1|order=flip}}<br />{{cvt|3298|cc|L|1|order=flip}}
| bore = {{cvt|90|mm|in|1|lk=on}}
| stroke = {{cvt|77.7|mm|in|1|lk=on}}<br>{{cvt|64.8|mm|in|1|lk=on}} 
| block = [[Aluminium]] alloy
| head = [[Aluminium]] alloy
| valvetrain = 32-valve, [[DOHC]], four-valves per cylinder
| power = {{cvt|490-700|hp|kW|0|lk=on}}
| torque = {{cvt|340-510|lbft|Nm|0|lk=on}}<ref name="spicerparts.com"/>
| oilsystem = Dry sump
| compression = 12.0:1-12.5:1
| fuelsystem = Electronic indirect fuel injection
| fueltype = [[Gasoline]]
}}
In 1981 a variant of the DFV named the DFL (for ''long-distance'') was produced specifically for use in the new [[Group C]] [[sports car racing]] class. The engine was modified to larger capacity {{convert|3298|cc|cuin|1|abbr= on}} and {{convert|3955|cc|cuin|1|abbr= on}} versions (despite technically being 4.0 Litres, the 3955 cc version was always referred to as a 3.9 Litre), both with wider bore and longer stroke dimensions than the standard DFV. Both versions were plagued by reliability issues worse than with the DFV they were supposed to replace. The 3.3&nbsp;L version powered [[Jean Rondeau (racing driver)|Rondeau]] to the second points standing in the [[World Sportscar Championship]] season of 1982, but it was insufficiently reliable to be competitive in the longer events. Thereafter, the 3.3&nbsp;L DFL in the C1 class was unsuccessful, with those who managed to actually finish invariably ending up behind C2 cars. The new fuel-restricted C Junior (C2) class in 1983 opened a niche for successful use of the 3.3&nbsp;L version, where low power tuning brought its reliability to a level where it could succeed. In the C2 category it powered many privateer cars, mostly [[Spice Engineering|Spices]] and [[Tiga Race Cars|Tigas]], to class victories around the world, including five at the [[24 Hours of Le Mans]] between 1985 and 1990. The 3.9&nbsp;L version never achieved the same success as its smaller sibling, with most users finding incurable engine vibrations and it was out of competition use by 1985. It was used to power the famous [[Ford Supervan]] and [[Ford Supervan 2|Supervan 2]] promotional projects, as well as the Australian designed and built [[Romano WE84]] in the [[Australian Sports Car Championship]], which ran the 3.0&nbsp;L DFV in the championship before upgrading to the 3.9&nbsp;L DFL for the [[1984 World Sportscar Championship season|1984 World Endurance Championship]] round at the [[Sandown Raceway]] in [[Melbourne]], where it finished 100 laps behind the class winner.

In August 1982, a turbocharged version of this engine was tested briefly on the [[Brands Hatch]] Circuit mounted on a [[Ford C100]].<ref>{{cite web |url=https://www.ultimatecarpage.com/spec/7284/Ford-C100.html |title = 1981 - 1982 Ford C100 Specifications - Ultimatecarpage.com}}</ref><ref>{{cite web |url=http://tech-racingcars.wikidot.com/ford-c100 |title = Ford C100 group C (1981) - Racing Cars}}</ref><ref>{{cite web |url=https://www.classicfordmag.co.uk/features/fords-forgotten-history-the-le-mans-c100/ |title=Ford's Forgotten History: The Le Mans C100 {{!}} Classic Ford Magazine |access-date=2021-11-19 |archive-date=2021-11-19 |archive-url=https://web.archive.org/web/20211119105508/https://www.classicfordmag.co.uk/features/fords-forgotten-history-the-le-mans-c100/ |url-status=dead }}</ref>