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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Primary Drive Ratios and Torque
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<blockquote data-quote="Monkeypants" data-source="post: 118635" data-attributes="member: 2708"><p>Other way round on the last paragraph, if I read it correctly.</p><p>But the numbers seem off.</p><p></p><p>The standard primary ratio for the postwar twin is 56 /35 or 1.6 to 1.</p><p>I don't know what reduction the Suzuki arrangement has, but if it gives a higher reduction number than this, ( lower geared primary), then torque on the gearbox would increase.</p><p></p><p>Some of the belt drive makers offer multiple gear ratios. For high output engines where the gearbox is highly stressed, it's quite common to use a high geared primary ( low reduction) to reduce torque load on the gearbox. You spin the gearbox faster so there is less torque going thru it, same horsepower coming out ( other than tiny increased friction losses)</p><p>The final drive ratios can be altered to give the same overall ratio.</p><p>This kind of change takes some load off the gearbox and puts it on the rear chain, which is generally a good thing.</p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 118635, member: 2708"] Other way round on the last paragraph, if I read it correctly. But the numbers seem off. The standard primary ratio for the postwar twin is 56 /35 or 1.6 to 1. I don't know what reduction the Suzuki arrangement has, but if it gives a higher reduction number than this, ( lower geared primary), then torque on the gearbox would increase. Some of the belt drive makers offer multiple gear ratios. For high output engines where the gearbox is highly stressed, it's quite common to use a high geared primary ( low reduction) to reduce torque load on the gearbox. You spin the gearbox faster so there is less torque going thru it, same horsepower coming out ( other than tiny increased friction losses) The final drive ratios can be altered to give the same overall ratio. This kind of change takes some load off the gearbox and puts it on the rear chain, which is generally a good thing. Glen [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Primary Drive Ratios and Torque
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