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Got to be a V10 IMHO. BMW will be only to keen to cement the F1/road car links for both technology and marketing purposes.
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raymond woertman said:
3: Compared to the V12, a V10 has smaller cranck-and camshafts. With smaller shafts, the magnitude of the torsional and harmonical vibrations are smaller. This allows a higher revving engine. Even compared to the older S38 and current S62 there may be benefits.

4: Last but not least, BMW already has gathered a lot of production experiences with a V10, the F1 engines.
I hardly think that BMW has a lot of experience with a V10 production.. They do a fine job for their forumla engines, but building an everyday street engine is completely different from a racing engine... I still believe that a V10 for the next M5 will be very unlikely.... The M5 is first and foremost a sedan, and having a rev-happy V10 is the last thing that a heavy sedan needs... sure, it's great to have a V10 engine, and be able to boast about it... but it's just a bit impractical for a sedan.. If anything, a V10 would be used in the new 6 series or a M1 replacement....
 
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