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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crank balancing
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<blockquote data-quote="tractorman414" data-source="post: 2761" data-attributes="member: 244"><p><strong>The story so far.</strong></p><p></p><p>Many thanks for your comments and advise</p><p></p><p>Have stripped the engine, made up a set of parallel knife blades to measure the balance, following Neville Higgins’s articles in MPH 700/702. All set to add weights to the rods in order to obtain balance and we find they are already rolling to put the crankpin at the bottom !! I had to add Bluetac to the wheels opposite the pin to get balance. About 15 gms. So using Neville formula with X as -15 I end up with a balance factor of 32.2%. Think this explains my vibration!! To get to 50% factor I will need to remove 216 gms. </p><p></p><p>I had a discussion with J & J engineering and they confirm earlier reports that its not practical to remove that much weight from the pin side, so its the heavy metal option opposite the pin and with so much weight involved I will leave it to the experts to fit</p></blockquote><p></p>
[QUOTE="tractorman414, post: 2761, member: 244"] [b]The story so far.[/b] Many thanks for your comments and advise Have stripped the engine, made up a set of parallel knife blades to measure the balance, following Neville Higgins’s articles in MPH 700/702. All set to add weights to the rods in order to obtain balance and we find they are already rolling to put the crankpin at the bottom !! I had to add Bluetac to the wheels opposite the pin to get balance. About 15 gms. So using Neville formula with X as -15 I end up with a balance factor of 32.2%. Think this explains my vibration!! To get to 50% factor I will need to remove 216 gms. I had a discussion with J & J engineering and they confirm earlier reports that its not practical to remove that much weight from the pin side, so its the heavy metal option opposite the pin and with so much weight involved I will leave it to the experts to fit [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Crank balancing
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