Try this excellent book for more info: A. Graham Bell’s Performance Tuning in Theory and Practice..
For some accurate calculations, try Larry Meaux's Pipe Max.
His program is excellent and will provide a lot of info.
Pipe Max
Piston weight in grams includes:
Piston
Piston Pin
Rings
Pin Retainers
With this calculator, you can see the effect of what a different rod length will have on the rotating inertia of your engine.
Compare what the results are with your rod length then use a different rod length to see what the new numbers are.
You can also see what the results would be with a different stroke.
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Wallace Racing