Quote:
Originally Posted by samckitt
These bushings for the rockers also have an oil groove to get the oil between the shaft & the bronze bushing. BUT, this bushing doesn’t make a full rotation around the shaft, so the oil never gets to the bottom side of the shaft where all the pressure is being applied. With only rotating (guessing) 15 degrees, the oil is not drawn down to where it is required, and with the force being applied at the bottom will push together tight & not allow the oil to penetrate.
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Where the load is is going to change as the rocker rotates, there's clearance between the bushing and the shaft so I believe it will get oil to the bottom as the load changes. I have no idea what the bushing material is since both companies were not willing to share that info but I do know there are impregnated bronze materials available that require little to no oil. We make our own cam thrust bushing out of impregnated bronze because the needle thrust bearing flex's, contacts the block thrust plate, and puts a burr on the thrust plate, that bushing gets very little oil and has been fine.
We'll see how it works out maybe it will, maybe it won't, all that I know is the current needle bearing kits available are not the answer. I'm going to pull several rockers off of my engine in the next week or so, press the bushings out, and check them for size against brand new ones. My engine should be the first one to have problems since the lift and ramp angles of the cam are really aggressive it tends to beat the valvetrain parts up.