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      02-03-2010, 10:19 AM   #37
mkoesel
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Drives: No BMW for now
Join Date: Jun 2006
Location: Canton, MI

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Speaking of the 4.4L motor, does anyone know the bore size? If it retains the 92mm bore from the 4L motor, the stroke should be about 82.7mm (like the old N62B44). If it has a larger bore, then it would have a shorter stroke. Its relevant because the longer stroke will generally have a direct impact on the longevity or durability of the motor. Of course, with a 98mm bore spacing, the S65 doesn't have much space for a bigger bore. Probably 94mm would be it about it (similar to the S62) and then you run into potential issues with too little cylinder material combined with the high RPM.
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