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BMW M30
The BMW M30 (early models are sometimes referred to as "M06") is a straight-6 SOHC piston engine which was used over a 28-year lifespan over many BMW models. Ward's have rated the M30 as one of the "Top Engines of the 20th Century".〔http://www.pacemotors.com.au/ArticleView.asp?ArticleID=4〕
It has been given the nicknames of 'Big Six' and 'Senior Six', following the introduction of the smaller BMW M20 straight-six in the late 1970s.
==Development==
The M30 was originally developed in the late 1960s, loosely based on the straight-four BMW M10 engine first used in the 'Neue Klasse' BMW 1500. Several features, including a 30-degree cam to the right for a lower profile, a crossflow head and a gas flow head in later models design, and a chain-driven single overhead cam with rocker arm valve actuation, are common between the M10 and the M30. Further similarities include a cast-iron block with an aluminium head and a forged crankshaft. The first two engines introduced were the 2.8 and the 2.5 litre option, both short-stroke engines sharing a common bore.〔
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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