Editing Jaguar V12 engine (section)

==TWR==
In 1982, [[Tom Walkinshaw Racing]] became Jaguar's official team in the [[European Touring Car Championship]], running the XJS with its 5.3L V12 which under the development of TWR would eventually produce a reliable {{convert|450|bhp|kW PS|0|abbr=on}}. And with drivers such as [[Tom Walkinshaw]] himself, Briton [[Win Percy]], West German star [[Hans Heyer]], and budding [[Formula One]] driver [[Martin Brundle]], the big Cats would soon become the cars to beat and in 1984 TWR had not only won the ETCC but had also won the 1984 [[Spa 24 Hours]] with Walkinshaw, Percy and Heyer driving. The XJS's were retired at the end of 1984 with TWR moving into running the [[Rover Vitesse]] in [[Touring car racing]] while becoming Jaguar's official factory team in the [[World Sportscar Championship|World Endurance Championship]], taking over the project from American team Group 44. However, the XJS V12's were brought out of their early retirement for one off events over 1985, 1986 and 1987 with their best result coming at the [[1985 James Hardie 1000]] at the famous [[Mount Panorama Circuit]] in [[Australia]]. Not only were the Jaguars easily the fastest cars in the race (in what was Australia's first year of running to Group A rules), but local Jaguar driver [[John Goss (racing driver)|John Goss]] teamed with TWR regular, West Germany's [[Armin Hahne]] in the team's 3rd car to win the race with Walkinshaw and Percy finishing 3rd.

As Jaguar's official World Sportscar Championship team, TWR's first car, XJR6, used the {{convert|5993|cc|L|1|order=flip|abbr=on}} engine, but in the following year the engine was upgraded to 6.9 L and in 1988 the XJR9 used the engine's most famous displacement of {{convert|6995|cc|L|1|order=flip|abbr=on}}. By 1991, the V12 was good for 7.4 L inside the XJR12, developing an impressive {{convert|750|bhp|kW PS|0|abbr=on}}

TWR also upgraded production Jaguar cars (usually XJRSes), with a variety of styling, handling and performance modifications. Most of the cars thus modified were straight from the Jaguar factory and sold through Jaguar dealerships.

By 1989, TWR were selling moderate numbers of XJRSes fitted with a {{convert|5993|cc|L|1|order=flip}} version of the V12, which pre-dated the Jaguar production version by some 3 years.