Editing Jaguar V12 engine (section)

=={{anchor|5.3}} 5.3 Litre==
The {{convert|5344|cc|L|1|order=flip}} production engine had an [[oversquare]] {{convert|90|mm|in|2|abbr=on}} [[Bore (engine)|bore]] x {{convert|70|mm|in|2|abbr=on}} [[Stroke (engine)|stroke]], producing {{convert|242|hp|kW PS|0|abbr=on}} to {{convert|295|hp|kW PS|0|abbr=on}} (depending on [[Vehicle emissions control|emission controls]] and [[compression ratio]]), and up to {{convert|400|Nm|lbft|0|abbr=on}} of torque in fuel-injected form. Right from the start of production in 1971 the V12 engine had [[Lucas Industries plc|Lucas]] OPUS (Oscillating Pick-Up System) [[electronic ignition]]. Initially the OPUS ignition amplifier unit was secured directly to the engine between the [[cylinder head]]s and had problems due to overheating. In later cars the ignition amplifier had been moved away from the engine where it could get [[air flow]] for cooling. Originally the V12 was supposed to use 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, Series 1 [[Jaguar XJ|XJ12]] and early Series 2 XJ12s (1973-April 1975) had four side draft [[Zenith Carburettor Company (British)|Zenith]]-[[Stromberg carburettor]]s. After April 1975, the V12 engine used in the Series 2 XJ12 and the new [[Jaguar XJ-S|XJ-S]] had a licensed copy of the [[Robert Bosch GmbH|Bosch]] [[Jetronic#D-Jetronic_(1967–1979)|D-Jetronic]] system adapted by Lucas for use on the V12.

This version was used in the following cars:<ref>Thorley, Nigel. ''Jaguar — All the Cars'', Haynes, 2003. {{ISBN|978-1-84425-693-8}}</ref>
* 1971-1974 [[Jaguar E-Type#Series 3 (1971–74)|Jaguar E-Type]]
* 1975–1981 [[Jaguar XJS]]
* 1972–1981 [[Jaguar XJ|Jaguar XJ12]] (Series 1 and 2)
* 1973–1981 [[Daimler Double-Six]] (Series 1 and 2)
* 1972-1981 [[Panther J72|Panther J.72]]
* 1974-1985 [[Panther De Ville]]