Stainless, Bushed PRW Rocker Arms

If you calculate the amount the roller rotates, do the math on how many times per second it would have to change directions. Now do the math on the angular momentum involved. Then figure out the load at the roller, and friction at the axle and the roller.

Take all that into account, even with a conservative ramp rate, and it would not be surprising to find the roller doesn't. It simply can't change direction fast enough without just skipping over the part and through the oil. I'm sure it figets around randomly though. Solid lifters would let the roller move about more though. So would some valve loft/float, but that's harder to measure
:rofl: