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      06-05-2011, 11:01 PM   #2
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Drives: 2007 RS4. 2012 S1000RR
Join Date: Mar 2008
Location: Seattle

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We would have to know the rotating mass and stroke length of each reciprocating assembly but if I had to venture a guess I am pretty sure the rod & pistons of the m3 will endure more force @ redline due to their higher acceleration.

Displacement has a little to do with it but it's mainly the RPM, the displacement plays into how massive each reciprocating assembly is (bore although the materials & manufacturing techniques play a larger role) and how fast the piston is being accelerated and decelerated each revolution.

All the info you could ever want right here:

You will just have a tough time getting values for some of the dimensions like rod length & piston mass.
2012 BMW S1000RR
2011 BMW M3