Jaguar AJ-V8 engine

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Jaguar AJ-V8
Jaguar AJ-V8 engine in a 2001 S-Type
ManufacturerJaguar Cars
Production1996–
PredecessorJaguar AJ16
Jaguar V12

The Jaguar AJ-V8 is a compact DOHC V8 piston engine used in many Jaguar vehicles. It was the fourth new engine type in the history of the company. In 1997 it replaced both designs previously available on Jaguar cars: the straight-6 Jaguar AJ6 engine (or rather its AJ16 variant), and the Jaguar V12 engine. It remained the only engine type available on Jaguar until 2002, when the Jaguar AJ-V6 engine was added to the list. The AJ-V8 is available in displacements ranging from 3.2 L to 5.0 L, and a supercharged version is also produced. Ford Motor Company used this small V8 in other products as well, including the Lincoln LS the 2002-2005 Ford Thunderbird as well as in several Land Rovers.

The AJ-V8 was designed to use Nikasil-coated cylinders rather than the more-common iron cylinder liners. However, like the BMW M60, high-sulphur fuel reacted with the Nikasil liners and caused engine failures. Jaguar replaced affected engines, and has used conventional cast-iron linings ever since.

The engine uses a two-state Variable Valve Timing system to switch the intake cam timing by 30°. Newer engines use a more sophisticated system which can vary intake timing incrementally up to 48°. The Lincoln version was made in the United States.

Other engine features include fracture-split forged powder metal connecting rods, a special one-piece cast camshaft, and reinforced plastic intake manifold.

The AJ-V8 was on the Ward's 10 Best Engines list for 2000.

AJ26

The 4.0 L (3996 cc) AJ26 engine was introduced in 1996 It has a square 86 mm bore and stroke. It was updated in 1998 as the AJ27 with continuously variable valve timing. The AJ-V8 was updated again in 2000 as the AJ28. The naturally-aspirated version produces 290 hp (216 kW) in the 2004 XK8.

Vehicles using this engine:

AJ26S

The supercharged version of the AJ26 is used in the high-performance R versions of Jaguar's cars. The engine was updated with AJ27 specifications for 2000. It produces 370 hp (276 kW) and 387 ft·lbf (525 N·m) with the help of an Eaton supercharger (modified roots-blower). The supercharged engine did not use variable cam timing as the normal benefits of improved volumetric efficiency are not noticeable on a boosted engine

Vehicles using the supercharged version include:

3.2

The 3.2 litre variant was the second to be introduced. It reduces the stroke to 70 mm and power falls to 240 hp (179 kW) and 233 ft·lbf (316 N·m).

Vehicles using this engine:

3.5

The 3.6 L (3555 cc/216 in³) "3.5" was used in the XJ series as well. The stroke was 76.5 mm. Output was 262 bhp (195 kW) at 6250 rpm and 345.0 N·m (254 ft·lbf) at 4200 rpm.

Vehicles using this engine:

  • 2002–present Jaguar XJ8 3.5, 262 hp (195 kW) and 254 ft·lbf (344 N·m)

AJ30/AJ35

The 3.9L (3934 cc) AJ30/AJ35 variant is a unique displacement used only by Ford and Lincoln and is built in Ford's Lima, OH engine plant. Bore is 86 mm and stroke is 85 mm. The AJ35 version introduced for the 2003 model year added variable valve timing of the intake camshafts and electronic throttle control. While the block, crankshaft, pistons, and connecting rods are all unique to this displacement, many other parts are shared with the AJ-V8 engines produced in the UK by Jaguar.

Vehicles using this engine:

The last AJ35 was produced in March 2006 after only 3 years. Total run of AJ30/35 was nearly 250,000 units

AJ34

The 4.2 L (4196 cc) AJ34 version features a longer 90.3 mm stroke with the same 86 mm bore. It was introduced in 2003 as the AJ33 and produces 294 hp (219 kW) at 6000 rpm with 303 ft·lbf (411 N·m) of torque at 4100 rpm.

Vehicles using this engine:

  • 2003–present Jaguar XK-series (294 hp, 303 ft·lbf)
  • 2003–present Jaguar S-Type 4.2, 300 hp (224 kW) and 310 ft·lbf (420 N·m)
  • 2004–present Jaguar XJ8, 300 hp (224 kW) and 310 ft·lbf (420 N·m)
  • 2009–present Jaguar XF, 300 hp (224 kW) and 310 ft·lbf (411 N·m)

AJ34S

The AJ34S is a supercharged/intercooled variant of the AJ34. It was introduced in 2003 to replace the 4.0 SC and produces 390 hp (291 kW) at 6100 RPM with 399 ft·lbf (541 N·m) of torque at 3500 rpm.

Vehicles using this engine:

AJ133

The AJ133 is a completely new design introduced in 2009. It shares only the cylinder head bolts and exhaust tappets with the previous engines. It is so far available in only one displacement - 5.0 litres, and incorporates spray-guided direct injection and variable camshaft timing. The supercharged variant uses a sixth-generation, twin vortex system (TVS) supercharger for improved efficiency.

Vehicles using this engine:

  • 2009–present Jaguar XFR, 510 hp (375 kW) and 461 ft·lbf (625 N·m)
  • 2009–present Jaguar XKR, 510 hp (375 kW) and 461 ft·lbf (625 N·m)
  • 2009–present Jaguar XF, 385 hp (283 kW) and 380 ft·lbf (515 N·m)
  • 2009–present Jaguar XK, 385 hp (283 kW) and 380 ft·lbf (515 N·m)

Land Rover 4.2

A de-bored supercharged version of the Land Rover 4.4 is that company's high-performance engine. It displaces 4.2 L (4197 cc/256 in³). Applications:

Aston Martin 4.3/4.7

Aston Martin hand-assembles a special version of the AJ-V8 for the V8 Vantage. This unit displaces 4.3 L (4280 cc/261 in³) and produces 380 hp (283 kW) at 7000 rpm and 302 ft·lbf (409 N·m) at 5000 rpm. This engine is unique to Aston Martin and features race-style dry-sump lubrication, which enables it to be mounted low to lower the centre of gravity. The engine is assembled by hand at the AM facility in Cologne, Germany, which also builds the V12 for the DB9 and Vanquish. The cylinder block, cylinder heads, crankshaft, connecting rods, pistons, camshafts, inlet and exhaust manifolds, lubrication system and engine management are all unique to the Aston Martin version.

In May 2008, Aston Martin released a new design that used pressed cylinder liners instead of cast-in liners. This allowed for thinner liners, and a higher capacity of 4.7L for the V8 Vantage. Power output increased to 420bhp (an 11% increase on the previous 4.3L unit) and peak torque to 470Nm (a 15% increase).

Applications:

Land Rover 4.4

4.4 L V8 in a 2006 Land Rover Range Rover Sport

The 4.4 L (4394 cc/268 in³) version features a 2 mm wider bore over the 4.0 to increase torque.

Vehicles using a 4.4 L AJ-V8 include:

5.0

A special 5.0 liter racing engine was produced with 550 hp (410 kW), though no road car uses this engine.

See also