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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Spring Strengths to be used with Fully Sprung Rear Seats and AVO Coil Over Dampers
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<blockquote data-quote="timetraveller" data-source="post: 157310" data-attributes="member: 456"><p>I got round to doing the calculations for what would happen if one replaced the original 8" long, 275 lbs/inch spring with two 4" long springs, one a 275 lbs/inch one and the other a 400 lbs/inch springs. I ignored any problems with having to provide a double top hat bush between the two to keep them in line and regard this as a very simplistic test as to whether a multi rate spring could be used.</p><p>The results are not encouraging. By the time the loading on the spring is 550 lbs, that is a twin with a 253 lbs/18.1 stone rider, the weaker spring will be coilbound and the stronger spring will have compressed by 1.38". Any increased load such as a 3G bump or a pillion passenger will only further compress the stronger spring. When the load gets to 800 lbs the stronger spring will also become coil bound.</p><p>An 800 lb load far exceeds any values shown in the earler table but not if a 3G load has to be taken into account.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 157310, member: 456"] I got round to doing the calculations for what would happen if one replaced the original 8" long, 275 lbs/inch spring with two 4" long springs, one a 275 lbs/inch one and the other a 400 lbs/inch springs. I ignored any problems with having to provide a double top hat bush between the two to keep them in line and regard this as a very simplistic test as to whether a multi rate spring could be used. The results are not encouraging. By the time the loading on the spring is 550 lbs, that is a twin with a 253 lbs/18.1 stone rider, the weaker spring will be coilbound and the stronger spring will have compressed by 1.38". Any increased load such as a 3G bump or a pillion passenger will only further compress the stronger spring. When the load gets to 800 lbs the stronger spring will also become coil bound. An 800 lb load far exceeds any values shown in the earler table but not if a 3G load has to be taken into account. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Spring Strengths to be used with Fully Sprung Rear Seats and AVO Coil Over Dampers
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