Quote:
Originally Posted by Jblack4083
It's no secret that the S engines were "derived" from their non-M counterparts. That doesn't mean the same exact materials have to be used.
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Yes, but for example S5X-series engines has larger diameter crankshaft bearings and connection rod bearings and higher block than M5x-series. Cylinder head is also special M-parts and totally differend than M5x-series, bolt holes are different, cooling holes are different places. Because standard M5x engine cannot rev 8000rpm.
But we can´t know is F80 M3 engine real s-engine. I think it can´t be just slightly modified N55 ..