Editing Cosworth DFV (section)

====DFX====
{{Infobox automobile engine
|name=[[Cosworth]] DFX<ref>{{Cite web|url=https://books.google.com/books?id=y-MDAAAAMBAJ&q=cosworth+dfx+engine+rpm&pg=PA76|title = Popular Mechanics|date = May 1987|publisher = Hearst Magazines}}</ref><ref>{{Cite web|url=https://www.museumofamericanspeed.com/cosworthindyengine.html|title = Cosworth DFX Indy Engine}}</ref>
|manufacturer={{flagicon|UK}} [[Ford Motor Company|Ford]]-Cosworth
|production=1976–1987
|configuration=90° [[V8 engine|V8]]
|bore={{cvt|85.67|mm|in|lk=on}}
|stroke={{cvt|57.3|mm|in|0|lk=on}}
|displacement={{cvt|2643|cc|L|1|order=flip}}
|valvetrain=32-valve, [[DOHC]], four-valves per cylinder
|power={{cvt|720-840|hp|kW|0|lk=on}}
|torque= {{cvt|340-490|lbft|Nm|0|lk=on}}<ref name="spicerparts.com"/>
|turbocharger=[[Cosworth]]
|oilsystem=Dry sump
|fuelsystem=[[Electronic fuel injection]]
|compression= 11.2:1
|fueltype=[[Gasoline]]
}}
A 2.65&nbsp;L [[turbocharged]] version of the DFV was developed privately by the [[Vels Parnelli Jones]] team for the 1976 [[United States Automobile Club|USAC]] [[IndyCar]] season, in the face of opposition from Duckworth.<ref name=DFXfiles>{{Cite magazine|author= Kirby, Gordon |title= The DFX Files |url= https://www.motorsportmagazine.com/archive/article/march-2013/115/dfx-files |date= March 2013 |magazine= [[Motor Sport (magazine)|Motor Sport]] |volume= 89 |issue= 3 |pages= 114–118 |access-date= 26 September 2018 }}</ref> The Parnelli-Cosworth car took its first victory at the [[1976 Pocono 500]], the fifth race of the season, driven by [[Al Unser]].<ref name=DFXfiles /> Unser and his Cosworth-powered Parnelli took two further victories before the end of the year, in Wisconsin and Phoenix, and finished the championship in fourth position.

Duckworth had been a guest of the Vels Parnelli team during the Pocono victory, as [[Parnelli Jones]] and [[Vel Miletich]] wanted to establish the team as the North American distributor for the turbocharged, Indycar-specification engine.<ref name=DFXfiles /> However, shortly after the maiden race victory Cosworth poached two key engineers from the Parnelli team and set up facilities in [[Torrance, California]], to develop and market the engine themselves.<ref name=DFXfiles /> Henceforth it became known as the '''DFX'''. It went on to dominate [[American Championship car racing|American Indy car]] racing in much the same way the DFV had dominated Formula One. The engine won the [[Indianapolis 500]] ten consecutive years from 1978 until 1987, as well as winning all USAC and [[Champ Car|CART]] championships between 1977 and 1987 except for one. For a brief time in the early 1980s, some of the DFX engines were [[Rebadging|badged]] as [[Ford Performance|Ford]]s. The DFX powered 81 consecutive Indy car victories from 1981 to 1986, and 153 victories total. By the time it was replaced, the DFX was developing over {{cvt|840|bhp}}.<ref name="motorsport02" />