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      06-21-2007, 04:46 PM   #66
GregW / Oregon
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Drives: 2015 M4 Coupe, 2012 ML350
Join Date: Nov 2005
Location: Lake Oswego, OR

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Over/under square

Quote:
Originally Posted by 2m3 View Post
I agree completely with swamp2.

On S54: I heard many horror stories about the weak engine from my friends working at BMW service dept., plus no way a high rev M engine has an over bore configuration (long stroke engine???)
S54 has 91mm bore x 87mm stroke, so oversquare by a factor of 1.05:1. The S65 is 92 x 75.2, or a ratio of 1.22:1, so much more oversquare.
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Greg Lake Oswego, Oregon, USA
2015 M4 Coupe - Silverstone/Sakhir/CF
2012 ML350