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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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<blockquote data-quote="passenger0_0" data-source="post: 88786" data-attributes="member: 208"><p>I understand where you're coming from Roger however I suggest if you're going to get cams made then best to stick to a known supplier. I've got some experience with a hand-held optical/laser scanner and can tell you his is not the way to go given the amount of post-processing required. Cam profiles need to be accurate to less then 0.0001" per degree rotation and any extremely minor imperfection can cause chaos in the valve train. davidd's approach is the most elegant I've seen to date to try to quantify cam/valve lift etc. ... and probably a response to so many profiles being out there. Best for davidd to comment on this though.</p><p>I agree with you that there seems to be an infinite range of profiles out there, probably caused by copy-grinding a copy of a copy, so why not go with what is proven to work? There are many good suppliers out there, Gary Robinson, Megacycle etc. ... so you know what you're getting.</p><p>In the past I've designed and built cams and followers, not for Vincent, but special applications and strangely enough the same style of Vincent mechanism, and can tell you first hand this is not an easy task unless you're prepared to spend a lot of money and time.</p><p>'Cam talk' is best made sharing a beer with friends and better to buy a know quantity from a reliable and proven supplier. </p><p>[ATTACH=full]18055[/ATTACH][ATTACH=full]18056[/ATTACH]</p></blockquote><p></p>
[QUOTE="passenger0_0, post: 88786, member: 208"] I understand where you're coming from Roger however I suggest if you're going to get cams made then best to stick to a known supplier. I've got some experience with a hand-held optical/laser scanner and can tell you his is not the way to go given the amount of post-processing required. Cam profiles need to be accurate to less then 0.0001" per degree rotation and any extremely minor imperfection can cause chaos in the valve train. davidd's approach is the most elegant I've seen to date to try to quantify cam/valve lift etc. ... and probably a response to so many profiles being out there. Best for davidd to comment on this though. I agree with you that there seems to be an infinite range of profiles out there, probably caused by copy-grinding a copy of a copy, so why not go with what is proven to work? There are many good suppliers out there, Gary Robinson, Megacycle etc. ... so you know what you're getting. In the past I've designed and built cams and followers, not for Vincent, but special applications and strangely enough the same style of Vincent mechanism, and can tell you first hand this is not an easy task unless you're prepared to spend a lot of money and time. 'Cam talk' is best made sharing a beer with friends and better to buy a know quantity from a reliable and proven supplier. [ATTACH=full]18055[/ATTACH][ATTACH=full]18056[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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