Quote:
Originally Posted by Sticky
72 degrees is traditional for v10's but not for the M5's S85, it is 90 degrees, the same as the v8.
"To achieve this in the E60 M5, M Division opted to use the same displacement but fitted into a 90* aluminum V10, which yields a more optimal per cylinder displacement and piston dimensions. A 90* design was chosen over a 72* V angle because of its more favorable vibration characteristics."
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My bad, it is 90 degrees on both S85 V10 and S65 V8, only two cylinders less.