Jaguar AJ-V6 engine

This article is about Duratec-based 60° V6 engines. For AJ-V8-based 90° V6, see Jaguar AJ-V8 engine § AJ126.

Jaguar AJ-V6
an AJ-V6 in a Jaguar X-Type
Overview
Manufacturer	Ford Motor Company for Jaguar Cars
Designer	Porsche
Production	1999–2011
Layout
Configuration	60° V6
Displacement	2.1 L (2,099 cc; 128.1 cu in) 2.5 L (2,495 cc; 152.3 cu in) 3.0 L (2,967 cc; 181.1 cu in)
Cylinder bore	81.6 mm (3.21 in) 89 mm (3.5 in)
Piston stroke	66.8 mm (2.63 in) 79.5 mm (3.13 in)
Cylinder block material	Aluminium
Cylinder head material	Aluminium
Valvetrain	DOHC 4 valves x cyl. with VVT
Compression ratio	10.3:1, 10.75:1
RPM range
Max. engine speed	6,800
Combustion
Fuel system	Sequential multi-port fuel injection
Fuel type	Gasoline
Oil system	Wet sump
Cooling system	Water-cooled
Output
Power output	157–260 hp (117–194 kW; 159–264 PS)
Torque output	148–221 lb⋅ft (201–300 N⋅m)
Chronology
Predecessor	Jaguar AJ16
Successor	Jaguar AJ126

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 a proprietary Cosworth cylinder head design to suit Ford's design brief. 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 2.1 L (2,099 cc), 2.5 L (2,495 cc) and 3.0 L (2,967 cc) displacements.

The AJ-V6 engine has an aluminium engine block. Its aluminium DOHC cylinder heads were designed by Jaguar Cars. Using sequential fuel injection, it has 4 valves per cylinder with VVT; fracture-split forged powder metal connecting rods; one-piece cast camshaft; and direct-acting mechanical bucket (DAMB) tappets — features that differentiate the AJ-V6 from the Ford and Mazda versions.

AJ20

The AJ20 version has an 81.6 mm × 66.8 mm (3.21 in × 2.63 in) bore and stroke, and displaces 2,099 cc (128.1 cu in). Although it displaces nearly 2.1-litres, it is marketed as a "2.0". It produces 157 hp (117 kW; 159 PS) and 148 lb⋅ft (201 N⋅m). The compression ratio is 10.75:1.

This engine is used in the following vehicles:

• Jaguar X-Type 2.0 (UK)

AJ25

The AJ25 displaces 2.5 L (2,495 cc; 152.3 cu in). It shares the AJ20's 81.6 mm (3.21 in) bore and is stroked to 79.5 mm (3.13 in), the same as the AJ30. It delivers 193 hp (144 kW; 196 PS) at 6800 rpm with 178 lb⋅ft (241 N⋅m) of torque at 3000 rpm with 10.3:1 compression.

This engine is used in the following vehicles:

• 2001–2009 Jaguar X-Type 2.5, 193 hp (144 kW; 196 PS) and 180 lb⋅ft (244 N⋅m)
• 2002–2006 Jaguar S-Type 2.5 (UK), 201 hp (150 kW; 204 PS) and 185 lb⋅ft (251 N⋅m)

AJ30

The AJ30 is the most common version, especially considering the Duratec 30. It has an 89 mm (3.5 in) bore and shares the AJ25's 79.5 mm (3.13 in) stroke, giving a displacement of 3.0 L (2,967 cc; 181.1 cu in). In the X-Type, it produces 228 hp (170 kW; 231 PS) and 209 lb⋅ft (283 N⋅m). 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 (179 kW; 243 PS) and 221 lb⋅ft (300 N⋅m)
• 2002–2009 Jaguar X-Type, 228 hp (170 kW; 231 PS) and 209 lb⋅ft (283 N⋅m)
• 2003–2010 Jaguar XJ, 237 hp (177 kW; 240 PS) and 216 lb⋅ft (293 N⋅m)
• 2008–2011 Jaguar XF 240 hp (179 kW; 243 PS) and 221 lb⋅ft (300 N⋅m)
• 2000–2006 Lincoln LS

See also

• Ford Duratec V6 engine
• Jaguar AJ-V8 engine