* So what your saying is vibration from the driveline is fed back into the crank? On a manual trans car the clutch disc has torsion springs in the hub which would isolate high frequency energy from the crank.
*Second order harmonics are taken care of by the twin counter shafts operating at 2X crank speed. Also I don't think second order harmonics damage a crank, they are eliminated for the comfort of the passengers.
* Then you go on to say "most modern engines have a short, strong crank with, a relatively high natural frequency. " later on you say modern engines have wimpy cranks. Which one is it? It can't be both.
* Real road race engines are torn down at least once per season, and their cranks are magnafluxed and inspected for cracks, not very practical on a daily driver.
look we,ll keep buy your products just stop BSing us.
Oh, by the way here is a link to an artical written by Steve Dinan (he may have some credibility) the artical is posted on the ATI racing website, ATI manufacture harmonic dampers. (they may also have some credibility)
http://www.atiperformanceproducts.co...mper_dinan.htm
Good Luck on your journey on the superhighway of misinformation!!