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Correct, I apologize for not being clear enough again. The 4th order harmonic I am referencing is the torsional harmonic, not the induced transverse vibration. The transverse vibrations may or may not be at a multiple of the crankshaft natural bending frequency, that I am not sure of, therefore I am not sure if it would be accurate to call them a harmonic or not. However, in some cases I do not believe that these vibrations even need to be at a resonant state to damage the bearings, as any large amplitude transverse strain (like a single peak from detonation) can be enough to damage a main bearing whether it has a cyclic mode or not. I guess In the end, I do not think that our engines see large enough amplitudes to do any real damage, (and Greg's work certainly supports this) but I sure would think twice about removing the damper from an inline-6. :)
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