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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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<blockquote data-quote="Phil Davies" data-source="post: 90330" data-attributes="member: 2541"><p>As I understand things, the Picador cam profile was designed in partnership with the radiused followers to give the cam follower a lesser stressed life at the much longer duration 'high revs' the Picador was required operate at (especially with the triple valve springs used).</p><p>Lever followers of the road engines are highly stressed at high revs (as I found out when racing) and were never stress tested properly even with the lightning engines as they never had to run flat out for long enough compared to what was asked of the Picador.</p><p>The Picador cam and follower form was (I believe) developed to follow what can be seen as a polydyne form that allowed the proper distributed loading of the follower.</p><p>As others have detailed, the radiused follower can only be used with a sympathetic cam form and a polydyne cam form does not work with a flat follower.</p></blockquote><p></p>
[QUOTE="Phil Davies, post: 90330, member: 2541"] As I understand things, the Picador cam profile was designed in partnership with the radiused followers to give the cam follower a lesser stressed life at the much longer duration 'high revs' the Picador was required operate at (especially with the triple valve springs used). Lever followers of the road engines are highly stressed at high revs (as I found out when racing) and were never stress tested properly even with the lightning engines as they never had to run flat out for long enough compared to what was asked of the Picador. The Picador cam and follower form was (I believe) developed to follow what can be seen as a polydyne form that allowed the proper distributed loading of the follower. As others have detailed, the radiused follower can only be used with a sympathetic cam form and a polydyne cam form does not work with a flat follower. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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