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Re: Harmonic Damper Required?
Its the torsional harmonics that move up and down the shaft, that can cause it to crack. If the engine ran most of the time at the same rpm, and there was a strong torsional offset at those RPM it will break.
The harmonic balancer is used to dampen or reduce these strong torsional offsets.
As the Corvair article also mentions is the affects these torsional offsets do the crank timing for spark, and the valve timing for the rear cylinders.
Harvey.
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