Re: Max RPM's
Jim, Short run time racing engines probably don't need the dynamic dampener. Performance touring engine do. Here is what a California friend wrote me: "One guy in our club has broken three or four cranks. He drives his Model A a lot and has been on a few long distance tours with us including one to Maine. He does push his engines pretty hard."
The problem is metal fatigue. It is high stress applied over time. The first order harmonic torsional vibration is right in the operating range of a high performance touring engine.
See: http://harmonicdampers.com/downloads...amper_Info.pdf
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