Jaguar AJ-V8 engine

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Jaguar AJ8
Overview
Manufacturer	1996–2012 Jaguar Cars 2013–present Jaguar Land Rover
Production	1996–present 2013–2020 (Jaguar AJ6)
Layout
Configuration	90° V8 90° V6
Displacement	3.0 L (2,995 cc) (V6) 3.5 L (3,473 cc) 3.9 L (3,934 cc) 4.0 L (3,996 cc) 4.2 L (4,196 cc) 4.3 L (4,280 cc) 4.4 L (4,394 cc) 4.7 L (4,735 cc) 5.0 L (5,000 cc)
Cylinder bore	84.5 mm (3.33 in) (V6) 86 mm (3.39 in) 88 mm (3.46 in) 89 mm (3.5 in) 91 mm (3.58 in) 92.5 mm (3.64 in)
Piston stroke	86 mm (3.39 in) 70 mm (2.76 in) 76.5 mm (3.01 in) 85 mm (3.35 in) 89 mm (3.5 in) (V6) 90.3 mm (3.56 in) 91 mm (3.58 in) 93 mm (3.66 in)
Cylinder block material	Aluminum alloy
Cylinder head material	Aluminum alloy
Valvetrain	DOHC 4 valves x cyl. with VVT
Compression ratio	10.5:1
Combustion
Supercharger	TVS with intercooler (on some versions)
Fuel system	Direct injection
Management	Bosch
Fuel type	Petrol
Cooling system	Water-cooled
Output
Power output	240–592 hp (179–441 kW; 243–600 PS)
Torque output	233–561 lb⋅ft (316–761 N⋅m)
Chronology
Predecessor	Jaguar AJ16 Jaguar V12 Rover V8 BMW M62
Successor	Ingenium AJ300 BMW N63 (Range Rover)

The Jaguar AJ-8 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. It was an in house design with work beginning before Ford's purchase 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 1999 with the launch of the S-Type, when the Jaguar AJ-V6 engine was added to the list. The AJ-V8 is available in displacements ranging from 3.2L to 5.0L, and a supercharged version is also produced. Ford Motor Company also used this engine in other cars, including the Lincoln LS and the 2002–2005 Ford Thunderbird, as well as in several Land Rovers, and the Aston Martin V8 Vantage.

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 coating and caused engine failures. Jaguar replaced affected engines, and has used conventional cast-iron linings ever since.

The engine originally used a two-state Variable Valve Timing system to switch the intake cam timing by 30°. Newer variants 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.

Ford ceased production of the AJ-V8 engine in September 2020 when it closed the Bridgend Plant.^[1] However, in August 2020 JLR was able to take over production means for the AJ-V8.^[2]