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The Mercedes Benz M186 Engine was a 3.0 litre single overhead camshaft inline-6 developed to power the company's new flagship 300 (W186) ''Adenauer'' four-door saloon. It made its debut at the Frankfurt Motor show in April 1951. Variants of the M186 went on to used in the exclusive 300s 300sc, iconic gullwing 300SL, and the luxurious 300SE sedans of the early 1960s. While sharing many design features with Mercedes' 2.2 litre (134ci) M180 engine introduced at the same show (such as staggered valve arrangement and rockers running off a single overhead camshaft driven by a duplex cam-chain) the two were of completely different design with little or no inter-changeability of parts.〔''Six Appeal'', Mercedes Enthusiast, May 2007, pp 52-58〕 The term "Big six" is sometimes used to distinguish the large block 3.0 L M186 from the small block M180 and its derivatives. ==M186 Variants== The 3.0 litre ‘big six’ was produced from 1951 until 1967 with no change in its 2996 cc/182 in³ displacement derived from a slightly under-square 85 mm x 88 mm bore and stroke. It featured an overhead cam, and an aluminum head with an innovative diagonal head-to-block joint that allowed for oversized intake and exhaust valve. The various versions of the engine (M186 – M199) produced from – as compression ratios rose and the number of carburettors multiplied or were replaced with fuel-injection.〔http://wiki.mercedes-benz-classic.com/ Mercedes-Benz classic wiki〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mercedes-Benz M186 engine」の詳細全文を読む スポンサード リンク
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