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Jaguar Mark 2
The Jaguar Mark 2 is a medium-sized saloon car built from late 1959〔(new) British Cars At Paris Show. ''The Times'', Friday, Oct 2, 1959; pg. 9; Issue 54581〕 to 1967 by Jaguar in Coventry, England. Twelve months before the announcement of the XJ6 the 2.4 Litre and 3.4 Litre Mark 2 models were renamed to Jaguar 240 and Jaguar 340 respectively. The previous Jaguar 2.4 Litre and 3.4 Litre models made between 1955 and 1959 have been identified as Mark 1 Jaguars since Jaguar produced this Mark 2 model.〔Eric Dymock, The Jaguar File, 3rd edition, 2004, Dove Publishing〕
Until the XJ, Jaguar's postwar saloons were usually denoted by Roman numerals (e.g. Mark VII, Mark VIII) while the Mark 2 used Arabic Numerals, denoted on the rear of the car as "MK 2".
==The XK engine==
Adhering to Sir William Lyons' maxim of "grace, pace and space", the Mark 2 was a fast and capable saloon. It came with a , or Jaguar XK engine. The 3.8 is similar to the unit used in the 3.8 E-Type (called XKE in the USA), having the same block, crank, connecting rods and pistons but different inlet manifold and carburation (two SUs versus three on the E-Type in Europe) and therefore less. The head of the six-cylinder engine in the Mark 2 had curved ports compared to the straight ports of the E-Type configuration. The 3.4 Litre and 3.8 Litre cars were fitted with twin SU HD6 carburettors and the 2.4 Litre with twin Solex carburettors.
Some explanation is required concerning the claimed bhp figures shown above. Jaguar used gross bhp figures throughout the production period of the Mk II and 240/340 models. A direct conversion into DIN bhp is not possible, but we know that the 3.8 Mk II engine developed around 190 bhp DIN. This compares with the later 4.2 XJ6 engine which also gave around 190 bhp DIN or 245 gross bhp, according to Jaguar, both being for 8:1 compression engines. The explanation was that the lower peak for the XJ6 4.2 engine meant that the bhp was being delivered at less rpm, for the same output.The camshaft timing and inlet and exhaust valve sizes were the same for the 2.4,3.4,3.8 Mk II and XJ6 4.2 engines, so the engines throttled themselves sooner in the bigger engine sizes. The later 4.2 XJ6 engines had special induction pipes, to reduce exhaust emissions, that crossed over between the inlet and exhaust sides of the engine, which reduced bhp to around 170 bhp on later production.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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