Regarding harmonic dampers...
Do they have to be "tuned" to the rotating assembly or are they "universal" (within reason)?
My guess is if they are true vibration dampers, they won't care much what they are damping but then again, they are part of a system that's vibrating in torsion so the masses and stiffness of all the components will affect the magnitude, resonant frequencies, and intrinsic component damping.
For example, I expect a cast iron crank to dampen vibe better than a steel crank. Similarly, aluminum rods are a third the stiffness of steel or iron, which has to affect vibe response of the system...
Sorry for the diversion - just going down my overthinking adventure path and about ready to replace the 52-yr-old damper on my car so it kind of popped up.
Mike
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