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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cams- looking end on
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<blockquote data-quote="timetraveller" data-source="post: 178030" data-attributes="member: 456"><p>As the cam rotates the contact line between the cam and follower slides up and down the follower and changes the ratio between the cam eccentricity and the valve lift. I have many times put valve lift graphs on here but you can't compare those with cam eccentricity figures For example, I can tell just by looking at Vibrac's picture in #3 above that the upper cam lobe is more like a Mk II than a Mk I but what it really is cannot be determined just by looking. It, preferably the valve lift, needs to be measured to determine whether it is usable or whether it would wreck an engine. If you have cams which have been used in one of our engines and which are known not to be destructive then just looking will tell you whether it is a Mk I or a Mk II. You will never see the difference between a Mk I and a Mk III and of several cams I have measured I have never seen quieting ramps.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 178030, member: 456"] As the cam rotates the contact line between the cam and follower slides up and down the follower and changes the ratio between the cam eccentricity and the valve lift. I have many times put valve lift graphs on here but you can't compare those with cam eccentricity figures For example, I can tell just by looking at Vibrac's picture in #3 above that the upper cam lobe is more like a Mk II than a Mk I but what it really is cannot be determined just by looking. It, preferably the valve lift, needs to be measured to determine whether it is usable or whether it would wreck an engine. If you have cams which have been used in one of our engines and which are known not to be destructive then just looking will tell you whether it is a Mk I or a Mk II. You will never see the difference between a Mk I and a Mk III and of several cams I have measured I have never seen quieting ramps. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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