BMW AG has developed a magnesium-aluminum engine crankcase for an inline 6-cyl. engine it will introduce in 2005. The two-part crankcase – the lower portion of the engine block that houses and supports the crankshaft and its bearings – uses a magnesium alloy where corrosion and stress do not occur, and aluminum where they do. Using magnesium saves 22 lbs. (10 kg) of mass, or 25%, compared to an all-aluminum crankcase, says BMW. The new crankcase design, developed at BMW's Landshut plant in ...

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