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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: 90373" data-attributes="member: 2541"><p>Passenger0_0 - "because I have previously used very aggressive cams with radius followers of both linear and lever types, some in (relatively for old engines) high speed applications (10,000 rpm)" -</p><p>Quite possibly, what I should have added to my original post was 'not unless the cam is specifically designed for a flat follower' - but I can see how my comment could easily be taken as scoping outside of Picador cams (which it was not intened to be), sorry about that.</p><p></p><p>Time traveller</p><p>I understood that back in the day (a long time ago as well as in valve spring tech terms), triple valve springs were used for damping the valve return motion, as back then, upping the spring rate was the first point of call for 'performing' engines, with possible consequent seat bounce otherwise.</p><p>I was under the impression that the due to the continious performance demand requirements picador engines used the lightning engine spec as a starting point, with changes (compared to a lightning) appearing as a consequence of the (pre MOD) testing for the running duration requirements, the cams and followers seemingly being an obvious one.</p><p>Going slighly away from my initial thread comment.</p><p>I too have used Gold Star springs in my race engine, I was always nervous of the increased valve train loading as a consequence, I had a cam follower snap (then jam against the cam and peel it open - oops!), but was unsure as to the real source of the failure (Stevenage age followers!).</p><p>I have to admit that I was always concerned about high spring rate on flat lever followers (snapped followers are not an uncommon story in non factory vincent racing history).</p><p>Nowadays all that is transformed by the availability of progressive rate springs that give unbelievably light seating pressures yet still control against wild cam forms.</p></blockquote><p></p>
[QUOTE="Phil Davies, post: 90373, member: 2541"] Passenger0_0 - "because I have previously used very aggressive cams with radius followers of both linear and lever types, some in (relatively for old engines) high speed applications (10,000 rpm)" - Quite possibly, what I should have added to my original post was 'not unless the cam is specifically designed for a flat follower' - but I can see how my comment could easily be taken as scoping outside of Picador cams (which it was not intened to be), sorry about that. Time traveller I understood that back in the day (a long time ago as well as in valve spring tech terms), triple valve springs were used for damping the valve return motion, as back then, upping the spring rate was the first point of call for 'performing' engines, with possible consequent seat bounce otherwise. I was under the impression that the due to the continious performance demand requirements picador engines used the lightning engine spec as a starting point, with changes (compared to a lightning) appearing as a consequence of the (pre MOD) testing for the running duration requirements, the cams and followers seemingly being an obvious one. Going slighly away from my initial thread comment. I too have used Gold Star springs in my race engine, I was always nervous of the increased valve train loading as a consequence, I had a cam follower snap (then jam against the cam and peel it open - oops!), but was unsure as to the real source of the failure (Stevenage age followers!). I have to admit that I was always concerned about high spring rate on flat lever followers (snapped followers are not an uncommon story in non factory vincent racing history). Nowadays all that is transformed by the availability of progressive rate springs that give unbelievably light seating pressures yet still control against wild cam forms. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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