EGS you're right that rotational mass can be 10 times as high as static mass. I'm talking about flywheel effect or rotational mass, too. The outside diameters are relatively small compared to other rotating parts. I think how far out from center the center of the mass is, is either squared or cubed to find flywheel effect.
I was giving this some thought a while back while doing a belt change on a 944. Thats when I determined that it takes a small amount of torque to turn the shafts. I did not disassemble & measure shafts so I could calculate the flywheel effect. A cuple of days latter, I looked into crankshaft mounted Fluidamper. They do not make a 944 or universal model that you can bore & key.
I'm surprised that there is a 3 to 4 HP gain from no shafts (per MAS). Considering how much a 3 to 4 HP gain costs $$$, it might be worth more study. I did not think that even accerating that no shafts would have the same affect as 3 to 4 HP.
drew1
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