Quote:
Originally Posted by Lemans_Blue_M
if the aftermarket crank is custom machined without these (or smaller lighter ones)...then you could still end up with a lighter overall crankshaft despite the longer throw.  |
I'd say no way countershaft weights could be reduced after adding displacement (and power). Maybe left the same, like some manufacturers do when enlarging their engines, but it'd be unacceptable on an M3 IMO.
You could get away with that on an I6 engine since it has perfect primary and secondary balance, but a 90º V8 has only perfect primary balance (no need for counterrotating balance shafts), so you need to quell the secondary order vibrations. It'd be nice to hear from the stroker folks to see what they're actually doing in that regard. And from stroker owners to see if they perceive more engine vibration. Doing things right definitely costs a lot of money, so I wouldn't be surprised if you're correct. Good day.