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An evolution of the 1964 DOHC prototype “XJ13” engine, the Jaguar V12 engine is a family of SOHC internal combustion V12 engines with a common block design, that were mass-produced by Jaguar Cars for a quarter of a century, from 1971 to 1997, mostly as 5.3‑litres, but later also as 6‑litres, and 7‑litre versions that were deployed in racing.
A 60-degree V12 engine is typically narrower than a 90-degree V6 or V8 engine of similar displacement. However, the V12 engine is usually longer than V6 and V8 engines. The added length often makes it difficult to fit a V12 engine into a passenger car, but the length is not typically a problem for trucks and stationary applications.
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:
An evolution of the design for the XJR-8, the XJR-9 was designed by Tony Southgate, built by Tom Walkinshaw Racing (TWR) and featured a Jaguar 7.0-litre V12 engine based on the production 5.3-litre engine as used in the Jaguar XJS road car. [3]
From July 1981, the XJ-S was renamed the XJ-S HE and received the new High-Efficiency V12 engine for much better fuel economy. A positive side effect of the more efficient "Fire Ball" combustion chamber designed by Swiss Engineer Michael May was that power output was increased to 295 hp (220 kW; 299 PS) or 263 hp (196 kW) in North America. [11]
The XJR-15 is powered by a 5,993 cc (6.0 L) 450 hp (336 kW), naturally aspirated 24-valve Jaguar V12 engine. The engine features an advanced electronically managed fuel injection system with a very advanced (for its time) 'fly by wire' throttle.
Jaguar had considered the manufacture of a Dual Overhead Camshaft (DOHC) V12 engine as far back as 1950, [2] initially for racing purposes, and then developing a Single Overhead Camshaft (SOHC) road-going version, unlike the XK, which was designed as a production engine and later pressed into service for racing. The engine design was ...
Given the model code XJ81, the XJ40-based XJ12 and Daimler Double Six were introduced at the Amsterdam Auto Show in February 1993 and powered by a 6.0-litre version of the Jaguar V12 engine. [5] This was mated to a GM 4L80E 4-speed automatic gearbox. It could be identified by the XJ12 or Double Six badge on the rear and a V12 emblem on the ...