Originally Posted by BigMacSmallFries
How come were assuming that more than just the engine block from the S55 will be used and bored out? the 991 GT3 engine is extremely different than that of the Carrera S even though the same block is used initially. Is there a source that indicated they would be very similar?
Assuming the M5 revs to 7200rpm, I think it would be impossible for the M3 to rev lower than that. I think realistically we should expect 7200 or 7300 as the minimum. 7200-7600 would be expected, 7600-8000 would be a nice surprise.
If you use the N55 block to develop the M3/M4 engine, its clear that the stroke was greater than the bore, an layout that make it almost impossible to combine high rpm and high pressure turbos, simply because the resulting forces are going too high ... only with an square cylinder layout it was possible to combine high pressure turbos with 8.000rpm.