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The Jaguar AJ-V8 is a compact V8 piston engine used in many Jaguar vehicles. It was the fourth new engine type in the history of the company. It is a DOHC design and replaced the Jaguar AJ6 engine in many cars. It is available in displacements ranging from 3.2 L to 5.0 L, and a supercharged version is also produced. The AJ-V8 was designed to use Nikasil-coated cylinders rather than the more-common iron cylinder liners. However, the 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°. 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.

• The Jaguar AJ26 4.0 L (3996 cc) engine was introduced in 1996. Vehicles using this engine are AJ26, 1997-1998 XJ8, 1997-1998 XK8 and AJ27, 1999-2004 XJ8, 1999-2004 XK8 and AJ28, 2000-2002 S-Type.
• The Jaguar AJ26S the supercharged version of the AJ26 is used in the high-performance R versions of Jaguar's cars. Vehicles using this engine are the 1998-1999 XJR, 1998-1999 XKR and AJ27S, 2000-2003 XJR, 2000-2003 XKR.
• The Jaguar 3.2 litre variant was the second to be introduced. Vehicles using this engine are the XJ.
• The Jaguar 3.6 L "3.5" was used in the XJ series as well. Vehicles using this engine are XJ8.
• The Jaguar AJ30/AJ35, 3.9L engine variant is a unique displacement used only by Ford and Lincoln and is built in Ford's Lima, OH engine plant. 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.
• The Jaguar 4.2 L AJ34 version features a longer 90.3 mm stroke with the same 86 mm bore. Vehicles using this engine are 2003 XK8, 2003–present S-Type 4.2 and the present XJ8.
• A special 5.0 liter racing engine was produced with 550 hp though no road car uses this engine.

Jaguar's V12 was one of the premiere powerplants of the 1970s and 1980s. It was a V12 piston engine, The engine first seen in the Series 3 E-type of 1971 was based loosely on an earlier design intended for a Le Mans car, the ill-fated Jaguar XJ13. The V12 was only Jaguar's second engine design to go into production in the history of the company. The all alloy block was fitted with removable wet liners and had a SOHC 2-valve alloy head with flat combustion chambers.

• The original 5.3 L version had an oversquare 90 mm bore and 70 mm stroke. It produced 210 kW (285 hp) (245 to 299 bhp depending on emission controls and compression ratio) and 400Nm (295 Lb-Ft) in fuel-injected form. The V12 engine used in the S2 XJ12 and the new XJ-S had a Lucas fuel injection system which was based around the Bosch D-Jetronic system. This version was used in the following cars, the Jaguar E-Type, 1975-1981 Jaguar XJS and the 1972-1981 Jaguar XJ12 (Series 1 and 2).
• A High-Efficiency 5.3 HE engine. This version of the engine used the special high swirl design 'May' cylinder head, and had an unusually high compression ratio (10.5:1 - 12.5:1 depending on market and year). In any given market, power levels remained similar to the previous model, but fuel economy was up by nearly 50%. The HE V12 engines had a fuel injection or engine control system from Lucas that was based on the Bosch P-Jetronic system. The 5.3 HE was used in these cars are the 1981-1992 Jaguar XJ12 (Series 3) and 1981-1992 Jaguar XJS.
• The 6.0 HE engine was stroked to 78.5 mm in 1992 for a displacement of 6.0 L (5994 cc) to make this the most powerful Jaguar production engine to date. The 6.0 HE was used in the following cars, 1992-1995 Jaguar XJS, 1993-1995 Jaguar XJ12 (XJ81) and the 1995-1996 Jaguar XJ12 (X305).