Quote:
Originally Posted by BMW-M-Mexico
Very true, most do test their cars however in this case, both Dinan and RDSport completed 90% of the real R&D when developing the stoker kit for the S85 V10 that is an identical engine in all respects other than the throw that is 90 degrees for the V8 rather than 72 degrees for the V10 (and of course two less cylinders). Clearly crank has to be a tad different but boring of the cylinders with technology that does not damage the silicone crystal wall, pistons, rings, con rods, bearings, valve changes, knife edging of the crank/piston assembly, reciprocating mass issues and the like are identical. Some work must be performed on headers (RDSport only) and thing one might want to add this time around.
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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."