Quote:
Originally Posted by cgarr
Well said Jeff, Thats what I thought, isn't the roller usually on the valve? I would think with all the oil in there you would get some skidding of the roller on the cam lobe.
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Yup, the roller is typically on the valve end. There is a significant "wiping" action of the rocker arm tip across the top of the valve that will actually kind of make the valve "wiggle" in the guide. It tries to push it away from, and pull it back towards, the pivot point of the rocker. The roller tip helps mitigate that.
In a pushrod motor, the pushrod side obviously doesn't have that problem. The top of the pushrod is free to move in and out on that axis as the rocker arm pivots.