Tooloe said:what do you mean crank speed an not cam speed the sound?
I think what he means is by the sound he thinks it is the crank due to the number of times the click is being heard over a given time frame. The Crank rotates at a different speed then the cam. It is the same for helicopter. High speed vibes come from the tail rotor. Low speed from the main rotor. They are both driven off the same engine, but through gear reduction one rotates faster then the other. I think this is what Silver meant anyways. :dontknow: