Editing Cosworth DFV (section)

====DFR====
{{Infobox automobile engine
| name = [[Cosworth]] DFR<ref name="Engine Ford Cosworth • STATS F1"/>
| image = 
| manufacturer = {{flagicon|UK}} [[Ford Motor Company|Ford]]-[[Cosworth]]
| production = 1988–1993
| configuration = [[V8 engine|V8]], [[naturally aspirated|naturally-aspirated]], 90° cylinder angle
| displacement = {{cvt|3494|cc|L|1|order=flip}}
| bore = {{cvt|90|mm|in|1|lk=on}}
| stroke = {{cvt|68.65|mm|in|1|lk=on}}
| block = [[Aluminium]] alloy
| head = [[Aluminium]] alloy
| valvetrain = 32-valve, [[DOHC]], four-valves per cylinder
| power = {{cvt|580-630|hp|kW|0|lk=on}}
| torque = {{cvt|320-400|lbft|Nm|0|lk=on}}<ref name="spicerparts.com"/>
| oilsystem = Dry sump
| weight = {{cvt|155|kg|lb|0|lk=on}}
| fuelsystem = Electronic indirect fuel injection
| fueltype = [[Gasoline]]
| predecessor = [[Cosworth GBA]]
| successor = [[Ford-Cosworth HB engine|Ford-Cosworth HB]]
}}
From {{f1|1987}} [[Benetton Formula|Benetton]] had been operating as the works Ford team, essentially taking over the role from the now defunct [[Haas Lola]] team. With the abandonment of turbocharging it was clear that the venerable DFV/Y/Z design was nowhere near being competitive with far newer offerings from [[Honda F1|Honda]] and [[Renault F1|Renault]] who were building [[V10 engine]]s for 1989 and beyond, and [[Scuderia Ferrari|Ferrari]] who were building what they knew, a [[V12 engine|V12]] ([[Lamborghini]] entered F1 in 1989 and like Ferrari, also went down the [[Lamborghini V12 engine|V12]] path). To counter this, drastic changes were made for the DFR of 1988. Although superficially a DFV-design, almost the only feature carried over from previous versions into the DFR was the basic 90° V8 engine architecture. The DFR became available to all customers in 1989, with the Benetton team also using this engine until the [[1989 British Grand Prix]]. The DFR struggled on until the 1991 season finally being eclipsed by the higher revving abilities of new [[pneumatic valve gear]] engines such as the HB, and was last used in that year's Australian Grand Prix by the Footwork, Fondmetal, Larrousse and Coloni teams, nearly a quarter of a century after the DFV's first race. By the time of its demise, continued improvement had pushed the DFR power output to nearly {{cvt|630|bhp|kW PS|0}},<ref name="motorsport02" /> 60% higher than the original 1967 DFV.

The DFR enjoyed success in 1988 with Benetton. The team was the best performed non-turbo team of the season finishing third in the Constructors' Championship behind Ferrari (turbo) and the all-conquering [[McLaren]]-Honda. [[Thierry Boutsen]] recorded five podium finishes and [[Alessandro Nannini]] scored two podiums. The DFR was also the most powerful non-turbo of the season with a reported {{cvt|620|bhp|kW PS|0}}. This compared to the 590 of the DFZ and the new [[Judd (engine)#CV|Judd]] V8 with a reported {{cvt|600|bhp|kW PS|0}}. This still lagged behind the Honda and Ferrari turbos which were producing over {{cvt|650|bhp|kW PS|0}} each.

The 3.5 L DFR engine was later used in the [[Allard J2X-C]] [[Group C]] [[sports car racing|sports car]], in 1992.<ref>{{cite web |url=https://www.ultimatecarpage.com/car/3532/Allard-J2X-C.html |title = 1992 - 1993 Allard J2X-C - Images, Specifications and Information}}</ref><ref>{{cite web |url=https://www.supercars.net/blog/1992-allard-j2x-c/ |title = 1992 Allard J2X-C {{!}} Allard {{!}} SuperCars.net}}</ref><ref>{{cite web| url = https://drivetribe.com/p/cutting-edge-1992-allard-j2x-c-Fl-f8egMTuig2wNXM7ON_w?iid=RWXtNxoxRguD-L45-2SdRA| title = Cutting Edge - 1992 Allard J2X-C| access-date = 2021-11-19| archive-date = 2021-11-19| archive-url = https://web.archive.org/web/20211119084011/https://drivetribe.com/p/cutting-edge-1992-allard-j2x-c-Fl-f8egMTuig2wNXM7ON_w?iid=RWXtNxoxRguD-L45-2SdRA| url-status = dead}}</ref><ref>{{cite web |url=http://www.mulsannescorner.com/allardj2x.html |title = Mulsanne's Corner: 1992-1993 Allard J2X}}</ref><ref>{{cite web |url=https://www.conceptcarz.com/z19754/allard-j2x-c.aspx |title = 1992 Allard J2X-C {{!}} conceptcarz.com}}</ref>