Well not to be negative, but if all they have is a pulley that you send them to go by, how can they evaluate all the effects on Duratec crank harmonics? I mean would they not need to know ALL the specifics on the crank and main bearings /girdle/rods - the reciprocating mass. And then test several prototypes on a running Duratec on a stand at different engine speeds for a lot of hours - measure frequences and such. I have been under this assumption - perhaps our resident experts could comment? Or is it really that simple to look at a stock damper and say - lets shape it like this and have it weigh this much and call it a day?
