Jaguar V12 engine - Definition and Overview

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.

5.3

The original 5.3 L (5343 cc) version had an undersquare 90mm bore and 70mm stroke and produced 240kW and 420Nm.

This version was used in the following cars:

• Jaguar E-Type
• 1975-1981 Jaguar XJS
• 1972-1981 Jaguar XJ12 (Series 1 and 2)

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

6.0 HE

The engine was stroked to 78.5mm 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)

See also

• Jaguar XK6 engine
• Jaguar AJ6 engine
• V12 Performance (http://www.jagweb.com/aj6eng/v12_performance.html)

	Current: XJ6 / XJ8 / XJ12 / XJR| S-TYPE | X-TYPE | XK8 / XKR
	Historic: Mark IV | Mark V | XK120 | Mark VII | C-Type | D-Type | XKSS | XK140 | Mark VIII | XK150 | Mark IX | Mark I | Mark II | E-Type (XKE) | Mark X | S-Type | XJ6 | XJR13 | XJS | XJR9 | XJ220 | XJR15
	Engines: XK6 | V12 | AJ6 | AJ-V8 | AJ-V6
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