Editing Ilmor (section)

==2.65 litre Indy car V-8==
{{Infobox automobile engine
|name=Ilmor 265-A<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.motorsportmagazine.com/archive/article/july-1991/71/british-grand-prix-preview-ilmor|title=British Grand Prix Preview - Ilmor|date=7 July 2014 }}</ref><ref>{{Cite web|url=http://www.race-cars.com/engsold/chevy/1098459638/1098459638ss.htm|title=Chevy Ilmor 265A Spec Sheet|access-date=11 October 2021|archive-date=21 January 2022|archive-url=https://web.archive.org/web/20220121201645/http://www.race-cars.com/engsold/chevy/1098459638/1098459638ss.htm|url-status=dead}}</ref>
|manufacturer={{flagicon|UK}}/{{flagicon|USA}} Ilmor-[[Chevrolet]]
|production=1984–1993
|configuration=90° [[V8 engine|V8]]
|bore={{convert|3.465|in|mm|lk=on|abbr=on}}
|stroke={{convert|2.142|in|mm|1|lk=on|abbr=on}}
|displacement={{convert|2.65|L|cuin|0|lk=on|abbr=on}}
|valvetrain=32-valve, [[DOHC]], four-valves per cylinder
|power={{convert|720-850|hp|kW|0|lk=on|abbr=on}}
|torque= {{convert|350-415|lbft|Nm|0|lk=on|abbr=on}}
|lubrication=Dry sump
|fuelsystem=[[Fuel injection#Multi-point injection|Mechanical multi-point fuel injection]]
|compression= 11:1
|fueltype=[[Gasoline]]
|oilsystem=[[Dry sump]]
}}
[[File:Ilmorchevyindyv8.JPG|thumb|The “Chevy” Indy V-8]]
{{See|Ilmor-Chevrolet 265-A engine}}
Both engineers were working at Cosworth on the [[Cosworth DFX]] turbocharged methanol engine for the [[Champ Car|CART Indy Car World Series]]; differences of opinion over the future development direction led them to break away from their parent company to pursue their own ideas. There was some acrimony in their split from Cosworth, their former employer claiming that the Ilmor engine was little different from their planned modifications to the DFX.<ref>Graham Robson, "Cosworth: The Search For Power"</ref>

Founded as an independent British engine manufacturer in 1983, it started building engines for Indy cars with the money of team owner and chassis manufacturer Roger Penske. The Ilmor 265-A, badged initially as the Ilmor-[[Chevrolet]] Indy V-8, debuted at the [[1986 Indianapolis 500]] with [[Penske Racing|Team Penske]] driver [[Al Unser]]. In 1987, the engine program expanded to all three Penske team drivers ([[Rick Mears]], [[Danny Sullivan]], and Al Unser), [[Patrick Racing]], and [[Newman/Haas Racing]]. [[Mario Andretti]], driving for Newman/Haas, won at [[Long Beach Grand Prix|Long Beach]], the engine's first Indy car victory. He also won the pole position for the [[1987 Indianapolis 500]]. [[Rick Mears]] earned the first victory for the engine in a 500 mile race at the [[1987 Pocono 500]]. A year later, now badged as the Chevrolet Indy V-8, Mears won the [[1988 Indianapolis 500]], the engine's first win at Indianapolis. The engine went on to have a record in [[Champ Car|CART]] of winning 64 of 78 races from 1987 to 1991.

In [[1992 PPG Indy Car World Series|1992]], the 265-A engine was followed up by the 265-B engine. The "Chevy-B" was fielded singly by Penske Racing ([[Rick Mears]] and [[Emerson Fittipaldi]]) in 1992 and won four CART series races. All other Ilmor teams remained with the "Chevy-A" for 1992. [[Bobby Rahal]], driving a "Chevy-A" won the 1992 CART championship, the fifth consecutive (and final) for the 265-A. [[Al Unser Jr.]] won the [[1992 Indianapolis 500]] driving a "Chevy-A", also the fifth consecutive (and final) Indy 500 win for the 265-A. [[Emerson Fittipaldi]] drove a "Chevy-B" to 4th place in points.

For the [[1993 PPG Indy Car World Series|1993 season]], the 265-C engine was introduced, intended to replace both the 265-A and the 265-B. Chevrolet dropped its badging support after the 1993 season.

For the [[1994 PPG Indy Car World Series|1994 season]], two new engines were introduced. The 265-D engine replaced the 265-C. Without badging support, the engines were referred to simply as the "Ilmor-C" and the "Ilmor-D". 

For 1995, [[Mercedes-Benz in motorsport|Mercedes-Benz]] became the badging manufacturer for the Ilmor Indy car engines. In [[1996 Indy Racing League season|1996]], the open wheel "split" began between CART and the IRL. Ilmor primarily was a provider for CART-based teams, and did not provide engines for any full-time IRL teams. At the [[1996 Indianapolis 500|1996 Indy 500]], the "Ilmor Mercedes-Benz D" was used by [[Galles Racing]], and finished second, the powerplant's one and only start in an [[Indy Racing League|IRL]]-sanctioned race. When the IRL switched to normally-aspirated engines for 1997, the 265s were no longer permitted in the IRL and the Indy 500, and from that point on raced in the CART series exclusively.