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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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<blockquote data-quote="Deleted member 3831" data-source="post: 90357"><p>Phil</p><p> the polynomial method of cam design does not necessarily result in a cam profile that has any form of negative curvature, it is a means of designing a smooth progressive transition from one linear design point to the next.</p><p>Also variously referred to as curve fitting, or splining, the method is most often applied using 5th order polynomial equations.</p><p>Attached is a screen shot of a polynomial curve applied to the linear points of a cam nose, which I trust will adequately illustrate the form.</p><p>Regarding the Picador cam, I am surprised to learn that tripple valve spring packs were used for this application, it sounds like a belt and braces arrangement to avoid any possibility of stoppage as a result of valve train failure.</p><p>Does anyone know whether any of these tripple spring packs still exist ?</p></blockquote><p></p>
[QUOTE="Deleted member 3831, post: 90357"] Phil the polynomial method of cam design does not necessarily result in a cam profile that has any form of negative curvature, it is a means of designing a smooth progressive transition from one linear design point to the next. Also variously referred to as curve fitting, or splining, the method is most often applied using 5th order polynomial equations. Attached is a screen shot of a polynomial curve applied to the linear points of a cam nose, which I trust will adequately illustrate the form. Regarding the Picador cam, I am surprised to learn that tripple valve spring packs were used for this application, it sounds like a belt and braces arrangement to avoid any possibility of stoppage as a result of valve train failure. Does anyone know whether any of these tripple spring packs still exist ? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Camshaft design
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