Jaguar AJ6 engine

Jaguar AJ6
Overview
ManufacturerJaguar Cars
Production1984–1996
Layout
ConfigurationStraight-6
Displacement2.9 L (2,919 cc)
3.2 L (3,239 cc)
3.6 L (3,590 cc)
4.0 L (3,980 cc)
Cylinder bore91 mm (3.58 in)
Piston stroke74.8 mm (2.94 in)
83 mm (3.27 in)
92 mm (3.62 in)
102 mm (4.02 in)
Cylinder block materialAluminium
Cylinder head materialAluminium
ValvetrainSOHC 2 valves x cyl.
DOHC 4 valves x cyl.
Compression ratio9.75:1
Combustion
SuperchargerEaton M90 (some versions)
TurbochargerTwin-turbo version developing 330bhp was developed for the prototype XJ41 sports car
Fuel systemLucas fuel injection
Fuel typePetrol
Cooling systemWater cooled
Output
Power output201–322 hp (150–240 kW; 204–326 PS)
Torque output325–512 N⋅m (240–378 lb⋅ft)
Chronology
PredecessorJaguar XK6
SuccessorJaguar AJ-V6
Jaguar AJ-V8

The AJ6 (Advanced Jaguar 6-cylinder), and the similar AJ16, are inline-6 piston engines used by Jaguar cars in the 1980s and 1990s. The AJ6 was designed to replace the successful and long-used Jaguar XK6 engine, and was introduced in 1984. It was only the third all-new engine ever designed by the company. The AJ16 evolution was replaced in 1996 with the Jaguar developed AJ-V8 engine.

Jaguar had considered cutting their existing V12 in half to build a V6, or possibly a V8, but chose instead to develop a new inline six. The cylinders are inclined, as in a slant-6, by 22 degrees. It uses an aluminium block to reduce weight, and has an optional DOHC head for higher efficiency and power.