Does anyone know why BMW reduced stroke/bore to odd 89,6/84 mm, resulting in a volume of 2979 cml? 90/84 mm would have resulted in 2993 cml, same as 330D which also uses a aluminum crankcase and closer to 3000 cml(3.0 L)! Does BMW use the E46 330I crankcase(has identical specs, including compression ratio!) because of development and production costs? I think the next change is programmed.
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