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Dirt Bike Mods & Maintenance
Balancing a Crank
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[QUOTE="EricGorr, post: 545268, member: 19611"] I agree with the article. I looked into crankshaft balancing machines and software at the recent Performance Racing Industry show. Basically the automotive tools balance against each other cylinder and reciprocating mass assembly. On a 2-stroke single, balance factor is the key. I got a hold of some second-hand notes from Jeff Bratton, probably the most famous crankshaft guy in the motorcycle industry, who now works for a factory roadrace team. His equations could be converted into an Excel spreadsheet and when talking with Phil Schaffer from Crank Works on the same topic, he mentioned that he uses a spreadsheet probably derived from the same information supplied by Bratton. But I've never seen an SAE paper published outlining balance factors for different rpm ranges or applications. I think that the guys who are doing this work (Crank Works, RPM, Poweroll, Falicon) aren't anxious to share it with the world because competitive information drives their businesses. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Balancing a Crank
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