Thanks so much for your insight on motor builds. I am not really interested in exchanging in an insult spree. So hope you are producing big heavy chips. https://www.bennetts.co.uk/bikesoci...tures/racing/10-most-extreme-6070s-race-bikes ThanksYou certainly did not build any drag race engine I could think of, to be run at 20k to 25k rpm. I believe, even 180 degree crank V8's, like Indy cars, don't get that high. Inertia is one thing, exactly how that inertia is/was created is another. Try running a clutch made for top fuel in an alcohol engine and you will quickly find that plain inertia alone does not explain all that takes place. The same piece of metal at the same rpm can behave much differently depending on the source impacting it. Source + inertia = power output? Different sources were what was being discussed.