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Jaguar V12 engine Jaguar's V12 piston engine was one of the heaviest engines of the 20th Century. It was first seen in the Series 3 E-type of 1971 and 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 5.3 L (5343 cc) version had an oversquare 90 mm bore and 70 mm stroke. It produced 210 kW (285 hp) (245 to 299 bhp (223 kW) depending on emission controls and compression ratio) and 400 Nm (295 ft·lbf) in fuel-injected form. Right from the start of production in 1971 for the Series 3 E-Type, the V12 engine had Lucas OPUS electronic ignition. This system was used until 1982 when the Lucas CEI system was introduced. Initially the OPUS ignition amplifier unit was secured directly to the engine between the cylinder heads and had problems due to overheating. Later cars had the ignition amplifier moved away from the engine where it could get air flow for cooling. Originally the V12 was supposed to get an advanced Fuel Injection system under development by AE Brico but this plan was cancelled at a late stage, possibly due to concerns that the design was too similar to Bosch products. The V12 as used in the Series 3 E-Types and the S1 XJ12 cars had four Zenith-Stromberg side draft carburetors. After April 1975, the ...

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