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OHV rocker pad radius?

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kitabel

kitabel

Automotive
Dec 14, 2005
20
Is the pad radius (where it contacts the stem tip) a pure geometric shape?
I've read it's a cycloid evolute curve, but can't track down attribution.
 
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All the ones I have access to are just a plain radius, and not very large either- say in the area of .50 inches.
 
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