Editing Cosworth (section)

===The GA/GAA V6===
[[File:Cosworth Capri DRM 1974.jpg|thumb|200px|The GA V6 in 1974 Ford Capri DRM]]
A fuel-injected belt-driven DOHC '''GA''' (also called the '''GAA''') was based on the 60 degree V6 block of [[Ford Essex V6 engine (UK)|Ford Essex]], and was used for the [[Ford Capri]]s raced in [[Group 2 (racing)|Group 2]] in the early 1970s. This had a capacity of {{convert|3412|cc|1|abbr=on|lk=on}}, and was highly competitive against the [[BMW]] straight-sixes. The GA was also used in the later years of [[Formula 5000]] in Europe.

The GA or GAA was commissioned by Ford in May 1972, when Ford realised that the Cologne V6 based Weslake OHV V6 engines used in their Capris which competed in the European Touring Car Championship had been modified to the point that no more performance could be extracted from them. Mike Hall, who had already designed the highly successful Cosworth DFV and BDA engines, took on the task of developing a whole new engine based on the 3-Litre Essex V6 block.

The new engine was radically different from the previously used Weslake unit in that it featured twin overhead camshaft aluminium alloy cylinder heads, 4 valves per cylinder, a Lucas mechanical fuel injection system, dry sump oiling system, a steel crankshaft, and enlarged displacement of 3412cc, compared with the 2.9&nbsp;litres of the previously used Cologne V6 based Weslake V6.

Ford expected a minimum of 400&nbsp;Hp from the new Cosworth engine; that figure was exceeded, with the engine producing 420&nbsp;Hp in the first test run. In race tune they finally produced around 462&nbsp;bhp (345&nbsp;kW; 468 PS) at 9000&nbsp;rpm and 300&nbsp;ft-lb of torque (407&nbsp;Nm). This meant that the new engine proved highly successful at competing against BMW in the 1973 Season of the European Touring Car Championship where the engine was installed in Ford's newly homologated Capri RS 3100.

Ford Motorsport also sold 100 Cosworth GA V6 engines, most of them ending up in Formula 5000 cars.

The GA/GAA V6 is a very rare, and extremely expensive engine, with rebuilt units priced at £50,000.<ref>{{cite web|url=http://www.weslake-capri.com/wordpress/?page_id=103|archive-url=https://web.archive.org/web/20131019052222/http://www.weslake-capri.com/wordpress/?page_id=103|url-status=dead|archive-date=19 October 2013|title=Engine – WESLAKE / COLOGNE GAA / GROUP-1 CAPRI|website=www.weslake-capri.com|access-date=5 July 2017}}</ref>

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