If I remember correctly, cast cranks suffer less from crank whip due to the even grain of the casting. But, you need forged material in high rpm applications, that is why a forged crankshaft is perfered in high rpm applications. In any case, you always use a harmonic balance to damper vibration and a dual mode damper dampens on two frequencies.
Just a thought, has anyone ever emailed the fluidamper company and requested they supply a balancer for our cars?
