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Jaguar AJ-V8
Overview
Manufacturer	1996–2012Jaguar Cars 2013–presentJaguar Land Rover
Production	1996–2010 2005-2017 (AM05/AM14) 2010–2012 (AJ133/AJ133S) 2013-present (AJ126/AJ133S)
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	DOHC4 valves x cyl. withVVT
Compression ratio	9.5:1 10.5:1 11.5:1
Combustion
Supercharger	Eaton M112 withintercooler (1996-2010) TVS withintercooler (2010-present)
Fuel system	Multi-port fuel injection (1996-2010) Direct injection (2010-present)
Management	Denso (1996-2012) Bosch (2013-present)
Fuel type	Petrol
Cooling system	Water-cooled
Output
Power output	240–592 hp (179–441 kW; 243–600 PS)
Torque output	233–516 lb⋅ft (316–700 N⋅m)
Chronology
Predecessor	Jaguar AJ16 Jaguar V12 Rover V8 BMW M62
Successor	Ingenium AJ300 BMW N63 (Range Rover)

TheJaguarAJ-V8 is a compactDOHCV8piston 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: thestraight-6Jaguar AJ6 engine (or rather its AJ16 variant), and theJaguar V12 engine. It remained the only engine type available on Jaguar until 1999 with the launch of the S-Type, when theJaguar AJ-V6 engine was added to the list. The AJ-V8 is available in displacements ranging from 3.2L to 5.0L, and asupercharged version is also produced.Ford Motor Company also used this engine in other cars, including theLincoln LS and the 2002–2005Ford Thunderbird, as well as in severalLand Rovers, and theAston Martin V8 Vantage.

The AJ-V8 was designed to useNikasil-coated cylinders rather than the more-common ironcylinder liners. However, like theBMW 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-stateVariable 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 metalconnecting rods, a special one-piece cast camshaft, and reinforced plasticintake manifold.

The AJ-V8 was on theWard'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]

The AJ8 engine was manufactured in a dedicated Jaguar facility located within theFord Bridgend Engine Plant inBridgend,South Wales. The Jaguar "plant-within-a-plant" saved considerable investment costs by Jaguar. It was staffed by workers dedicated to Jaguar engine production and included a linked flow-line of computer numerically controlled machines with automated loading and assembly. Component supply was on a "just-in-time" basis.^[3][4][5][6]

Jaguar Land Rover has subsequently produced the AJ supercharged petrol V8 Jaguar Land Rover engines in a state-of-the-art Engine Manufacturing Centre in Wolverhampton.^[7]

The 4.0 L (3,996 cc)AJ26 engine was introduced in 1996. The number "26" comes from 12+6+8 (cylinders), because when the first ideas were sketched, a family of 6-, 8- and 12-cylinder engines was contemplated, although only the 8-cylinder version was produced. It has a square 86 mm (3.39 in) bore and stroke. It was updated in 1998 as theAJ27 with continuously variable valve timing. The AJ-V8 was updated again in 2000 as theAJ28. Thenaturally aspirated version produces 290 hp (216 kW; 294 PS) in the 2000–2002 XK8.

Vehicles using this engine:

• AJ26
  • 1997–1998Jaguar XJ8
  • 1997–1998Jaguar XK8
  • 1997–1998Daimler V8
• AJ27
  • 1999–2003Jaguar XJ8
  • 1999–2003Jaguar XK8
  • 1999–2003Daimler V8
• AJ28
  • 2000–2002Jaguar S-Type 281 hp (210 kW; 285 PS), 287 lb⋅ft (389 N⋅m)

The supercharged version of theAJ26 is used in the high-performanceR versions of Jaguar's cars. The engine was updated withAJ27 specifications for 2000. It produces 370 hp (276 kW; 375 PS) and 387 lb⋅ft (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:

• AJ26S
  • 1998–1999Jaguar XJR
  • 1998–1999Jaguar XKR
  • 1998–1999Daimler Super V8
• AJ27S
  • 2000–2003Jaguar XJR
  • 2000–2003Jaguar XKR
  • 2000–2003Daimler Super V8

The 3.2 litre variant was the second to be introduced. It reduces the stroke to 70 mm (2.76 in) and power falls to 240 hp (179 kW; 243 PS) and 233 lb⋅ft (316 N⋅m). This variant was not available in the North American market. This engine did not use variable cam timing.

Vehicles using this engine:

• 1997–2003Jaguar XJ8

The 3.6 L; 216.9 cu in (3,555 cc) engine, marketed as a "3.5", was only used in the XJ series. The stroke was 76.5 mm (3.01 in). Output was 262 bhp (195 kW; 266 PS) at 6,250 rpm and 345 N⋅m (254 lb⋅ft) at 4,200 rpm.

Vehicles using this engine:

• 2002–2007Jaguar XJ8 3.5, 262 hp (195 kW; 266 PS) and 254 lb⋅ft (344 N⋅m)

The 3.9 L (3,934 cc)AJ30/AJ35 variant is a unique displacement used only byFord andLincoln and is built in Ford'sLima, OH engine plant. Bore and stroke is 86 mm × 85 mm (3.39 in × 3.35 in). 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:

• 2000–2002Lincoln LS, 252 hp (188 kW; 255 PS) 267 lb⋅ft (362 N⋅m)
• 2002Ford Thunderbird, 252 hp (188 kW; 255 PS) 267 lb⋅ft (362 N⋅m)
• 2003–2006Lincoln LS, 280 hp (209 kW; 284 PS) 286 lb⋅ft (388 N⋅m)
• 2003–2005Ford Thunderbird, 280 hp (209 kW; 284 PS) 286 lb⋅ft (388 N⋅m)
• Ford Forty-Nine concept

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

The 4.196 L; 256.1 cu in (4,196 cc),AJ33 andAJ34 versions retain the 86 mm (3.39 in) bore with 90.3 mm (3.56 in) stroke. It was introduced in 2002 as theAJ33 and produces 294 hp (219 kW; 298 PS) at 6,000 rpm with 303 lb⋅ft (411 N⋅m) of torque at 4,100 rpm, later increased to 300 hp (224 kW; 304 PS) and 310 lb⋅ft (420 N⋅m).

Vehicles using this engine:

• 2003–2006Jaguar XK-series 294 hp (219 kW; 298 PS), 303 lb⋅ft (411 N⋅m)
• 2006–2008Jaguar XK-series 300 hp (224 kW; 304 PS), 310 lb⋅ft (420 N⋅m)
• 2002–2008Jaguar S-Type 4.2, 300 hp (224 kW; 304 PS) and 310 lb⋅ft (420 N⋅m)
• 2004–2009Jaguar XJ8, 300 hp (224 kW; 304 PS) and 310 lb⋅ft (420 N⋅m)
• 2008–2010Jaguar XF, 300 hp (224 kW; 304 PS) and 310 lb⋅ft (420 N⋅m)

TheAJ33S is a supercharged/intercooled variant of theAJ33. It was introduced in 2002 to replace the 4.0 SC and produces 390 hp (291 kW; 395 PS) at 6,100 rpm with 399 lb⋅ft (541 N⋅m) of torque at 3,500 rpm. The engine was later updated toAJ34S specification to include Variable Valve Timing as well as other minor updates.

Vehicles using this engine:

• 2004–2009Jaguar XJR/Super V8, 400 hp (298 kW; 406 PS) and 408 lb⋅ft (553 N⋅m)
• 2003–2006Jaguar XKR, 400 hp (298 kW; 406 PS) and 408 lb⋅ft (553 N⋅m)
• 2006–2008Jaguar XKR, 420 hp (313 kW; 426 PS) and 410 lb⋅ft (556 N⋅m)
• 2003–2008Jaguar S-Type R, 400 hp (298 kW; 406 PS) and 408 lb⋅ft (553 N⋅m)
• 2005–2009Daimler Super Eight
• 2008–2010Jaguar XF, 420 hp (313 kW; 426 PS) and 408 lb⋅ft (553 N⋅m)

Land Rover also offered a supercharged version of the 4.2 L as that company's high-performance engine. Land Rover's version is not the same as the Jaguar's version but it was adapted from it.^[8]

Applications:

• 2006–2009Land Rover Range Rover Sport 390 hp (291 kW; 395 PS) and 406 lb⋅ft (550 N⋅m)
• 2006–2009Land Rover Range Rover 400 hp (298 kW; 406 PS) and 413 lb⋅ft (560 N⋅m)

The 4.4 L; 268.1 cu in (4,394 cc)AJ41 version features an 88 mm × 90.3 mm (3.46 in × 3.56 in) bore and stroke. This engine replaced theBMW M62 engine used in 2003-2005Range Rover models.

Applications:

• 2005–2009Land Rover Discovery 3 / LR3 - 300 hp (224 kW; 304 PS), 315 lb⋅ft (427 N⋅m)
• 2006–2009Land Rover Range Rover Sport - 300 hp (224 kW; 304 PS) at 5,500 rpm, 315 lb⋅ft (427 N⋅m) at 4,000 rpm
• 2006–2009Land Rover Range Rover - 305 hp (227 kW; 309 PS) at 5,750 rpm, 325 lb⋅ft (441 N⋅m) at 4,000 rpm

Aston Martin hand-assembles a special version of the AJ-V8 for the 2005V8 Vantage known asAM05 – or while it was under development asAJ37. This unit displaced 4.3 L; 261.2 cu in (4,280 cc) and produces 380 bhp (283 kW; 385 PS) at 7,000 rpm and 409 N⋅m (302 lb⋅ft) at 5,000 rpm. This engine is unique to Aston Martin and features race-styledry-sump lubrication, which enables it to be mounted low to lower the centre of gravity. The firing order is the same as the other AJ-V8 engines although the cylinder numbering is different (AJ37 = 1-5-4-2-6-3-7-8 vs. AJ26 = 1-2-7-3-4-5-6-8). The engine is assembled by hand at the AM facility inCologne,Germany, which also builds theV12 for theDB9 andVanquish. 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 4.7 L (4,735 cc; 288.9 cu in) for theV8 Vantage. Called theAM14, power output increased to 420 bhp (313 kW; 426 PS) (an 11% increase on the previous 4.3-litre unit) and peak torque to 470 N⋅m (347 lb⋅ft) (a 15% increase). The Aston Martin V8 Vantage S features the same 4.7-litre V8 engine found in the base Vantage, but with improved intake airflow, new mufflers, and new programming that keeps the exhaust system's bypass valves open longer. The engine in the V8 Vantage S now develops 430 bhp (321 kW; 436 PS) at 7,300 rpm and torque of 490 N⋅m (361 lb⋅ft) at 5,000 rpm representing an increase of 10 bhp (7 kW; 10 PS) and 20 N⋅m (15 lb⋅ft) respectively. This engine is also used in the bespokeAston Martin DB10 concept car for the 2015James Bond filmSpectre.

4.3, bore and stroke 89 mm × 86 mm (3.50 in × 3.39 in)

4.7, bore and stroke 91 mm × 91 mm (3.58 in × 3.58 in)

Applications:

• 2005–2017Aston Martin V8 Vantage
• 2014–2015Aston Martin DB10 (Concept car)
• 2018Aston Martin Cygnet

An all newdirect injection 5.0 L engine family was introduced in 2009, for the 2010 model year.^[9] The AJ133 is a 90° V8 engine available in either supercharged or naturally aspirated form, with a bore & stroke of 92.5 mm × 93 mm (3.64 in × 3.66 in) and a compression ratio of 9.5:1 for the supercharged version and 11.5:1 for the naturally aspirated one respectively.

The main structural components of the engine are all manufactured from aluminium alloy. The engine is built around a very stiff, lightweight, enclosed V, deep skirt cylinder block, with an open-deck design. A structural windage tray is bolted to the bottom of the cylinder block to further improve the block stiffness, minimize NVH (noise, vibration and harshness) and help reduce oil foaming. To further enhance the stiffness of the lower engine structure, a heavily ribbed sump body is installed. The sump body also helps to reduce engine noise.

A spheroidal graphite cast-iron crankshaft is utilized with high-strength cast pistons and fracture-split forged steel connecting rods manufactured from 36 Mn VS4 steel.^[10]

The engine uses aBosch high pressure direct injection fuel system with fuel pressure provided by two, cam driven high pressure pumps which are driven by a dedicated camshaft. The high pressure pumps supply the fuel rails which in turn supply the four injectors for that bank with fuel at a controlled pressure.

The four camshafts incorporate VCT (variable camshaft timing). VCT allows the timing of the intake and exhaust valves to be adjusted independently of each other.

The naturally aspirated engine features cam profile switching and variable tract length inlet manifold.

Supercharged engines make use of a sixth-generation 1.9L TVS (Twin Vortices Series) supercharger, which is located in the 'vee' of the engine and is driven from the crankshaft by a dedicated secondary drive belt.

Denso's Generation 1.6 Engine Management System was used on earlier models, later switching to Bosch's MED17 engine management 2013+ (except for the XKR and XKR-S).

The direct fuel injection system, advanced piston and combustion chamber design and the supercharger provide improved fuel consumption and emissions, as these engines meet EU5 emission regulations in Europe and Rest of World (ROW) and ULEV 70 emission regulations in North American Specification (NAS) markets.

The naturally aspirated engine was replaced by the AJ126 supercharged V6 engine starting for the 2013 model year. It has since been replaced by the all-newIngenium turbocharged inline-6 engine.

As of December 2024, Jaguar has discontinued most of its internal combustion engine (ICE) models, including those featuring the AJ133S, as part of its transition to an all-electric lineup by 2025. The 2024 Land Rover Defender V8 is the final vehicle to use the AJ133S engine. For the 2025.5 model year, it was joined in Defender by BMW’s 4.4L N63 twin-turbo V8 in the Octa derivative, (NC11 had already been introduced in the 2022 Range Rover and 2023 Range Rover Sport).

Land Rover version is called 'LR-V8 Petrol engine'.

The AJ133S is the supercharged variant of the AJ133, featuring an Eaton TVS1900R supercharger. It incorporates twin water-to-air intercoolers and a front-mount heat exchanger, with a shared cooling circuit. Differences over the naturally aspirated engine include; flat-top pistons for a lower compression ratio (9.5:1 vs 11.5:1), piston-oil spray jets, and different intake camshafts without cam-profile switching capabilities.

All AJ133S engines utilize the same supercharger pulley setup, capable of producing approximately 15PSI of boost. Differences in ECU calibrations determine the final power output.

Over its production span, the AJ133/S underwent several modifications to enhance performance, reliability, and compliance with evolving emission standards. Key changes by model year include:

2010:

• Equipped with 10.5mm cylinder head bolts.
• Utilized a Tsubaki timing chain with a 6.35mm pitch (except for X351 XJ and Land Rover models, which used an 8mm pitch chain from INA).
• Featured Denso engine management.
• Employed a vacuum-actuated supercharger bypass valve.
• Supercharged variants had aluminum coolant crossover pipes.

2011:

• All AJ133 variants transitioned to an INA timing chain with an 8mm pitch for MY2012 vehicles.
• Introduced redesigned timing chain guides and tensioners.
• Switched to plastic coolant crossover pipes for supercharged models.

2013 (excluding XKR & XKR-S):

• Upgraded to 11mm cylinder head bolts.
• Adopted Bosch MED17 engine management.
• Implemented an electric supercharger bypass valve.
• Added an eco-start-stop starter motor.
• Updated air box assemblies, mass air flow (MAF) sensors, and throttle body.

2014:

• Further redesigned timing chain guides, incorporating an added steel button for MY2015 vehicles.
• Introduced new timing chain tensioners.

2021 (specific to F-Pace SVR & F-Type P450/P575):

• Removed the mechanical vacuum pump, replacing it with a blanking plate.

2024:

• Updated the coolant crossover pipes to aluminum in MY24 Defender and Jaguar F-Pace SVR vehicles. LR186859 & LR186917.

These updates aimed to address known issues and improve the engine’s overall performance and durability. For instance, the timing chain and tensioner revisions were implemented to enhance reliability. Additionally, the shift to Bosch engine management systems facilitated better integration with modern vehicle electronics and emission control systems.

The AJ126 V6 uses a AJ133 V8 engine block with the rear two cylinder bores blanked, and reduced bore sizes on the remaining six cylinders.^[11] While the engine block is the same size as the V8, the cylinder heads are shortened versions of the V8 heads. It is made on the same production line as the AJ133.

The AJ126 is a 3.0 L; 182.8 cu in (2,995 cc) 90° petrol V6, having a bore and stroke of 84.5 mm × 89 mm (3.33 in × 3.50 in) with a 10.5:1 compression ratio. It is supercharged and liquid cooled featuring direct fuel injection, four overhead camshafts and four valves per cylinder. There are two versions differing in power produced, a standard version making 340 PS (250 kW; 335 hp) at 6,500 rpm and 332 lb⋅ft (450 N⋅m) between 3,500-5,000 rpm and a high-performance variant making 380 PS (279 kW; 375 hp) at 6,500 rpm and 339 lb⋅ft (460 N⋅m) between 3,500-5,000 rpm. A specialJaguar F-Type 400 Sport model made 400 PS (294 kW; 395 hp) and 339 lb⋅ft (460 N⋅m).

The AJ126 engine is equipped with an Eaton TVS Roots-type supercharger. Specifically a 1.3L Eaton TVS R1320, mounted in the engine’s “vee” and is known for its compact design, efficiency, and ability to deliver smooth, immediate power.

Jaguar has since replaced the AJ-126 with an all newIngenium turbocharged inline-6 engine.

• Jaguar AJ6 engine
• Jaguar AJ-V6 engine
• Jaguar V12 engine

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