Editing Cosworth (section)

===Other IndyCar and Champ Car engines===
{{Further|Ford-Cosworth Indy V8 engine}}
[[File:Cosworth V8 Engine Champ Car 2004.jpg|thumb|A 2004 Champ Car display engine]]
Cosworth designed a series of replacements for the DFS to be used in IndyCar and [[Champ Car]] racing: the X-series, beginning in 1992 with the '''XB'''. The '''XF''' was developed for the 2000 season to replace the '''XD''', and was chosen as the spec engine for the [[Champ Car World Series]] in 2003. The most recent derivative of the '''XF''', the {{convert|2650|cc|1|lk=on}} '''XFE''' quad-cam 90° V8 overhead camshaft, continued in that role through the 2007 season. The Champ Car World Series imposed a rev limit of 12,000&nbsp;rpm down from the over 15,000&nbsp;rpm of 2002. The 2004 model of the XFE had a rated power of nominal {{convert|750|hp|kW PS|0|lk=in}} at 1,054&nbsp;[[mmHg]] (intake boost pressure), and a maximum power of {{convert|800|bhp|kW PS|0|abbr=on}} at 1130&nbsp;mmHg (during Push-to-Pass). The 2004 XFE maximum speed was 12,000&nbsp;rpm (rev limited) and torque of {{convert|490|Nm|0|abbr=on|lk=on}}. The aluminium and iron turbo housing ran a boost of 5.9&nbsp;[[pounds per square inch|psi]] at sea level (= boost of 12&nbsp;[[inches of mercury]] which is 41.5&nbsp;[[inches of mercury]] absolute). The Methanol-fuelled engine used a steel crankshaft and aluminium alloy pistons. Weight was {{convert|120|kg|1|abbr=on}} and length was {{convert|539|mm|1|abbr=on}}.

In 2007, the Ford name was removed from the engine as the manufacturer elected not to continue sponsorship of the series.<ref name=indycomp>{{cite web |url=http://indycompetition.com/engines--engine-parts.html |title=Racing Engines & Parts: Cosworth Ford XFE Indy Car Engines Now Available |website=indycompetition.com |access-date=18 January 2021}}</ref> Several other engine changes were made, notably the removal of the calibrated "pop off valve" designed to limit turbo boost pressure, replaced by engine electronics. The rated life of the engine was {{convert|1400|mi|km}} between rebuilds. Engines were sent by the race teams to Cosworth for the rebuild. In 2007, Champ Car switched to the new [[Panoz DP01]] chassis, which was said to provide better ducting of airflow into the engine. The Champ Car World Series merged into the [[Indy Racing League]] [[IndyCar Series]] prior to the 2008 season, and Cosworth does not currently provide engines to any American open wheel racing series.{{citation needed|date=July 2009}}

In mid-2003, Cosworth provided the 3.5&nbsp;L V8 '''XG''' badged as a Chevrolet Gen 4 engine to IRL IndyCar Series teams after the proprietary Chevrolet Gen 3 engine proved inadequate against rival Hondas and Toyotas during the 2003 season.{{citation needed|date=July 2009}} While many teams left Chevrolet after the 2003 season, those that stayed saw a significant improvement in performance with the new "Chevworth" engine compared to their previous units. The XG finished second in its first race at Michigan on July 27, 2003. Sam Hornish Jr. went on to win 3 races that season with the new XG. The XG was reduced in size to 3&nbsp;L for 2004 season and it won one race in 2005 during Chevrolet's final season in IRL.

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