Originally Posted by Holander
I know what I am talking. Inline six have major harmonic vibrations on high rpms, because crank is so long (S54 have low rod ratio too). To handle vibrations S54 Block is made steel not aluminium and Crank and rod bearings are bigger than normal M5X engine.
An engine that has primary and secondary harmonic balance CANNOT have a high rpm vibration unless the crank is improperly weighted which has nothing to do with the length
If they produced harmonic vibrations, they would have a balancer more like i4 or v6 or v8.
Inline 6 motors are popupar BECAUSE they have no issues at high rpm.. It's like saying a rotary has high rpm vibration issues because of balance. Totally laughable.