Bob weight and RPM

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Re: Bob weight and RPM [Re: emarine01] #585032 01/17/10 04:49 PM 01/17/10 04:49 PM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	Quote: Given the engine with the lighter bob weight has proper balancing for the weight change, is there a way of measuring the lighter rotating assembly and express it in max rpm change? The answer is yes. If you know the weak link capacity of either the rod or bolts. With any given balanced assembly/bobweight you could calculate a max rpm based on the calculated forces. Example, if your rod bolts are good for 74,000# You could calculate a RPM that could be reached before you surpass that 74,000# limit. Some engine programs will calculate that automatically for you. Boggs had one that would give the numbers. Sorry, I dont have the Formula to figure it out at hand. I bet Jeff, Polyspheric would have it. mike Last edited by Sport440; 01/17/10 04:51 PM.

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