Jaguar AJ-V6 engine

The Jaguar AJ-V6 engine is a piston engine based on the Ford Duratec V6 engine. The Duratec V6 was originally a Porsche design, purchased by the Ford Motor Company with Cosworth finishing the engineering to suit Ford's needs. One notable addition is the use of variable valve timing, a feature also shared with Mazda's version of the engine. It is available in 2099 cc, 2495 cc and 2967 cc displacements.

The AJ-V6 engine has an aluminium engine block and Jaguar Cars designed aluminium DOHC cylinder heads. It uses sequential fuel injection, has 4 valves per cylinder with VVT, features fracture-split forged powder metal connecting rods and a one-piece cast camshaft and has direct-acting mechanical bucket (DAMB) tappets, these design aspects differentiating the AJ-V6 from the Ford and Mazda versions.

AJ20
The AJ20 2099 cc version has an 81.6x66.8 mm bore and stroke. Although it displaces nearly 2099 cc, it is marketed as a "2.0". It produces 157 hp and 148 lbft. The compression ratio is 10.75:1.

This engine is used in the following vehicles:
 * Jaguar X-Type 2.0 (UK)

AJ25
The AJ25 is a 2495 cc version built. It shares the 2.1's 81.6 mm bore and is stroked to 79.5 mm, the same as the 2967 cc. It delivers 193 hp at 6800 rpm with 178 lbft of torque at 3000 rpm from 10.3:1 compression.

This engine is used in the following vehicles:
 * 2001-2009 Jaguar X-Type 2.5, 193 hp and 180 lbft
 * 2002-2006 Jaguar S-Type 2.5 (UK), 201 hp and 185 lbft

AJ30
The AJ30 is a 2967 cc version and is the most common, especially considering the Duratec 30. It has an 89 mm bore and shares the 2.5's 79.5 mm stroke. In the X-Type, it produces 228 hp and 209 lbft. The Jaguar XF debuted a refined version of the AJ30 with continuously variable cam-phasing and variable geometry air intakes to increase power and broaden the powerband up to its 6800 rpm redline.

This engine is used in the following vehicles:
 * 2000-2008 Jaguar S-Type, 240 hp and 221 lbft
 * 2002-2009 Jaguar X-Type, 228 hp and 209 lbft
 * 2003-2010 Jaguar XJ, 237 hp (177 kW; 240 PS) and 216 lbft
 * 2008-2011 Jaguar XF 240 hp and 221 lbft
 * 2000-2006 Lincoln LS