Alright, I have done some searching on here, got some info, but I have some questions.

I found a thread stating that 1lb of rotating mass = about 15lbs dead weight. Sweet!

Now, wouldn't this formula vary according to what part(s) are rotating?

I would think that crank/flywheel would be one formula, engine accssorys would be another, driveshaft another, and axle/brake drums/wheels be a another. The reason I'm thinking this is most of that goes thru a gear system changing its speed/ratio off the orginal formula. Would that gearing change anything?

Also, does anyone know how much 1cubic inch of steel, and aluminum weight?

I would like to do some figuring, and see if the gains I can make are worth that of my time and money. I know less roating mass is better, but is that better worth my pocket book?

 

i tihnk the big differance is how far fro the center of gravity it is located. you also need to consider it's better to remove weight from the front than the rear. cubic inch of steel is .283 pounds and cubic inch of aluminum is .0998 pounds

 

And such calculations apply only to acceleration and deceleration forces. Once a mass is moving, input power remains constant.

"A mass in motion tends to remain in motion..."

 

The gearing will certanly change things. In low gear, the rotating assy. accelerates alot faster then it does in a higher gear so all that mass has to be spun up rapidly and you loose power to that. Id only go as far as maybe getting an aluminum driveshaft and thats about it. Not worth it if your not racing or something.