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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Engine Shock Absorber
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<blockquote data-quote="Monkeypants" data-source="post: 116876" data-attributes="member: 2708"><p>There is likely as much cush in a chain as in a steel and poly belt. The belt is really continuos steel cables encased in rubber or similar. The steel cables don't offer much cush.</p><p>I setup a Newby belt in the vice. With small steel measuring blocks clamped</p><p>to the belt I measure 9.546" between the blocks with a small amount of tension applied, just enough to pull the belt straight.</p><p>I then leaned into a tension bar with all my weight and all the leg strength I could muster. The bar tensioner had a mechanical advantage of about 4 to 1.</p><p>We could calculate the tension in the belt, but it's not really necessary.</p><p>It's many times what a Vincent engine can create.</p><p>The measurement blocks were still the same distance apart- well almost at 9.548". This is with a digital caliper so the 2 thou is +- anyway.</p><p>Jim Comstock told me there wasn't any give in the belts, but I thought it would be fun to try stretching one anyway.</p><p>He also mentioned that he ran his Norton about 100,000 miles without a cush.</p><p>I still think a cush somewhere in the system is a good thing to have.</p><p>The likes of Suzuki, Honda, Yamaha and Kawasaki agree.</p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 116876, member: 2708"] There is likely as much cush in a chain as in a steel and poly belt. The belt is really continuos steel cables encased in rubber or similar. The steel cables don't offer much cush. I setup a Newby belt in the vice. With small steel measuring blocks clamped to the belt I measure 9.546" between the blocks with a small amount of tension applied, just enough to pull the belt straight. I then leaned into a tension bar with all my weight and all the leg strength I could muster. The bar tensioner had a mechanical advantage of about 4 to 1. We could calculate the tension in the belt, but it's not really necessary. It's many times what a Vincent engine can create. The measurement blocks were still the same distance apart- well almost at 9.548". This is with a digital caliper so the 2 thou is +- anyway. Jim Comstock told me there wasn't any give in the belts, but I thought it would be fun to try stretching one anyway. He also mentioned that he ran his Norton about 100,000 miles without a cush. I still think a cush somewhere in the system is a good thing to have. The likes of Suzuki, Honda, Yamaha and Kawasaki agree. Glen [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Engine Shock Absorber
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