Originally Posted by kiloil
Just out of curiosity why does the engine max out at 7800RPM instead of 8400RPM like stock E92? Could you raise the stroker to 8400 without major internal changes?
When stroked, the pistons have to travel a greater distance in the same amount of time at the same RPM compared to a stock engine. So assuming the pistons could only move so fast, the redline must be lowered. I'm not sure what has to be done to keep the redline the same, but it wouldn't be cheap.