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BMC A-Series engine
Austin Motor Company's small straight-4 automobile engine, the A-Series, is one of the most common in the world. Launched in 1951 with the Austin A30, production lasted until 2000 in the Mini. It used a cast-iron block and cylinder head, and a steel crankshaft with 3 main bearings. The camshaft ran in the cylinder block, driven by a single-row chain for most applications, and with tappets sliding in the block, accessible through pressed steel side covers for most applications, and with overhead valves operated through rockers. The cylinder head for the overhead-valve version of the A-Series engine was designed by Harry Weslake – a cylinder head specialist famed for his involvement in SS (Jaguar) engines and several F1 title winning engines. Although a 'clean sheet' design the A-Series owed much to established Austin engine design practise, resembling in general design (including the Weslake head) and overall appearance a scaled-down version of the 1200cc overhead-valve engine first seen in the Austin A40 Devon which would form the basis of the later B-Series engine.
The A-Series design was licensed by Nissan of Japan, along with other Austin designs. That company quickly began modifying the A-Series as the Nissan A engine, and it became the basis for many of their following engines.
==Specifications==
All engines had a cast iron head and block, and two valves per cylinder in an OHV configuration. Engines were available in Diesel in the BMC tractor.
All A-series engines up until mid-1970 were painted in British Standard (381c) 223 Middle Bronze Green. : Source Austin Morris (BL) internal documents archives. This does not include overseas production models such as Australian manufacture.
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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