Stainless, Bushed PRW Rocker Arms

fishmens67 said

I suggest you do some research, spring pressure and the sweep is too narrow for it to roll as you think. not to mention rpm.
It actually slides, skips, skids, whatever.

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If the diameter of the roller is 1/2 inch, its circumference is 1.5708 inches. 2 x pi x radius. So if it “rolls” 5/16 of an inch, it “rolls” less than 1/6 of its circumference, or .3125/1.5708=.1989. Now 5% scrub would be .95 x .1989.=.18899. So every 7 or so times the valve actuates, the roller would spin totally around. This would promote even roller wear and reduce friction and in turn heat.

This is my common sense hypothesis, it may scrub more than 5%, but doubt more than 20%. I’m not a mathematician so any of you guy that are smarter than me and I know there are some on here, can check my math.

Like I said if you can show me solid data to the contrary, this is what I believe is happening at the roller/valve tip.