Quote:
Originally Posted by NISFAN
Do you not think that it is the cylinder head that makes the biggest difference to defining what 'special' is?
I'm pretty sure the S55 will have a all new cylinder head, pistons and conrods. Most likely Crankshaft too. For sure the Turbo arrangement will be unique, and according to the GURU above BMW M will ensure it has NO lag as that is what people want  |
Not sure if that was directed more at Uli or me. Either way I will bite.
The heads indeed can be a huge part of turning an ordinary engine into a much more special and high performance one. The M3/4 will undoubtedly have a heavily modified or entirely different head. I am not so sure it will require different internals such pistons, rods and crank. The cost/volume side of the equation leads me to believe those will be common.