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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Identifying cams
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<blockquote data-quote="davidd" data-source="post: 178663" data-attributes="member: 1177"><p>There is little to no dyno work on this subject, but four strokes suffer inherently from the "bang and glide" problem because there is only one power stroke out of the four strokes. The solution has been to use dampers on clutches, ESAs, and rear wheels. The sprinters were the first to notice the problem with valves bouncing around and failing to seat properly. Stuart Hooper used to pack his flywheels full of tungsten slugs and would often say that he could not get his flywheels heavy enough to hit the speeds he was shooting for with his LSR attempts.</p><p></p><p>Marty Dickerson used to tell the story of handing a lightened cam pinion to Phil Irving at one of the Vincent rallies. Phil examined it carefully, then threw it on the floor and said "I spent hours calculating exactly the correct weight of the pinion to damp the valve opening and closing and you go and ruin it!"</p><p></p><p>I don't see anything wrong with lightening the reciprocating parts, but the parts that are rotating and doing the damping should be approached with care. Racers who enjoy lightening things rarely worry about reliability and performance.</p><p></p><p>David</p></blockquote><p></p>
[QUOTE="davidd, post: 178663, member: 1177"] There is little to no dyno work on this subject, but four strokes suffer inherently from the "bang and glide" problem because there is only one power stroke out of the four strokes. The solution has been to use dampers on clutches, ESAs, and rear wheels. The sprinters were the first to notice the problem with valves bouncing around and failing to seat properly. Stuart Hooper used to pack his flywheels full of tungsten slugs and would often say that he could not get his flywheels heavy enough to hit the speeds he was shooting for with his LSR attempts. Marty Dickerson used to tell the story of handing a lightened cam pinion to Phil Irving at one of the Vincent rallies. Phil examined it carefully, then threw it on the floor and said "I spent hours calculating exactly the correct weight of the pinion to damp the valve opening and closing and you go and ruin it!" I don't see anything wrong with lightening the reciprocating parts, but the parts that are rotating and doing the damping should be approached with care. Racers who enjoy lightening things rarely worry about reliability and performance. David [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Identifying cams
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