Jaguar AJ-V6 engine

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Jaguar AJ-V6
ManufacturerJaguar Cars
PredecessorJaguar AJ16

The Jaguar AJ-V6 engine is a specialized version of Ford's Duratec 25/30 V6. 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 2.0 L, 2.5 L and 3.0 L displacements.

Jaguar's AJ-V6 engine has an aluminium engine block and aluminium DOHC cylinder heads. It uses SFI 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.


The AJ20 2.1 L (2099 cc) version has an 81.6 mm bore and 66.8 mm stroke. Although it displaces nearly 2.1 liters, it is marketed as a "2.0". It produces 157 hp (117 kW) and 148 ft·lbf (196 N·m). The compression ratio is 10.75:1.

This engine is used in the following vehicles:


The AJ25 is a 2.5 L (2495 cc/152 in³) version built in Ford's Cleveland, OH #2 factory. It is stroked to 79.5 mm. It delivers 192 hp (143 kW) at 6800 rpm with 178 ft.lbf (241 Nm) of torque at 3000 rpm from 10.3:1 compression.

This engine is used in the following vehicles:

  • –present Jaguar X-Type 2.5, 194 hp (145 kW) and 180 ft·lbf (244 N·m)
  • –present Jaguar S-Type 2.5 (UK), 201 hp (150 kW) and 185 ft·lbf (251 N·m)


The AJ30 is a 3.0 L (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 231 hp (172 kW) and 209 ft·lbf (284 Nm).

This engine is used in the following vehicles:

  • 2000–present Jaguar S-Type, 240 hp (179 kW) and 216 ft·lbf (293 N·m)
  • 2002–present Jaguar X-Type, 231 hp (172 kW) and 209 ft·lbf (283 N·m)
  • 2009–present Jaguar XF, 240 hp (179 kW) and 221 ft·lbf (300 N·m)

The Jaguar XF will debut 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.

See also