Originally Posted By Blusmbl


It can take 100+ extra horsepower to drive a supercharger even on a mild 600-700hp street engine, so the entire rotating assembly is going to see additional stress from the cylinder pressures over an n/a motor. However, for the same displacement the n/a motor would have to spin at higher rpm, which requires more expensive valvetrain components.


Cranks see maximum stress near TDC. Because boosted motors run less timing, the cranks actually see a lot less stress vs. a N/A motor.