Jaguar V12 engine
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{{Infobox Automobile
|name=Jaguar V12
|manufacturer=Jaguar Cars
|production=1972–1996
|class=SOHC V12
|successor=Jaguar AJ-V8
|engine=5.3 L (5343 cc/326 in³)
6.0 L (5994 cc/365 in³)
}}
Jaguar's V12 was one of the premiere powerplants of the 1970s and 1980s. It was a V12 piston engine, originally designed for a Le Mans car, the ill-fated Jaguar XJ13. The V12 was only Jaguar's second engine design in the history of the company. It had a SOHC 2-valve head with flat combustion chambers.
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5.3
The original 5.3 L (5343 cc) version had an oversquare 90 mm bore and 70 mm stroke. It produced 210 kW (285 hp) and 400Nm (295 ft·lbf) in fuel-injected form.
This version was used in the following cars:
- Jaguar E-Type
- 1975-1981 Jaguar XJS
- 1972-1981 Jaguar XJ12 (Series 1 and 2)
- 1973-1981 Daimler Double Six (Series 1 and 2)
- Panther J72
- Panther De Ville
5.3 HE
A High-Efficiency 5.3 HE debuted in 1982. Although power was down somewhat, fuel economy was up by nearly 50%.
The 5.3 HE was used in these cars:
- 1982 Jaguar XJ12 (Series 3)
- 1982-1992 Jaguar XJS
- 1982-1989 [{Daimler Double Six]] (Series 3)
6.0 HE
The engine was stroked to 78.5 mm in 1989 for a displacement of 6.0 L (5994 cc) to bring back some of the power lost to emissions requirements.
The 6.0 HE was used in the following cars:
- 1994-1995 Jaguar XJS
- 1994-1995 Jaguar XJSC
- Jaguar XJ12 (XJ40)
- 1994-1996 Jaguar XJ12 (X300)
- 1990-96 Daimler Double Six (XJ40 and X300)
TWR/Lister
In 1985, Tom Walkinshaw Racing became Jaguar's official team in World Endurance Championship, taking over the project from American team Group 44. Their first car, XJR6, used the 6.0 L 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 7.0 L. By 1991, the V12 was good for 7.4 L inside the XJR12, developing an impressive 750 bhp.
Lister Cars, a well-known Jaguar tuner with a long history of technical collaboration with the British automaker, was the first to use the TWR-tuned engine in a road car. In 1991, they fitted the 7.0 L (6996 cc/427 in³) version of the engine, with a 94 mm (3.7 in) bore and 84 mm (3.3 in) stroke, into a modified Jaguar XJS, which was rebadged Lister Le Mans. This engine officially produced 407.2 kW (546 hp) and 786.37 N·m (580 ft·lbf). From 1993, Lister owner Laurence Pearce produced the company's first design the Lister Storm, which, naturally, continued using the V12 engine, both on the road and on the track, with the car becoming a mainstay of the FIA GT Championship and several national championships for the following decade.