Mike,
I'm running the 1.5 rollers with the stock pushrods and had no oil pooling
problems. Then again, the flow of oil out of the rocker gear is not that
great, amounting to a seep rather than a gush. I'm a bit concerned about
the amount of oil that must be coming out of yours to fill up a rocker
cover. Did you also change over to the chilled iron tappets that don't have
the oil hole? Not that those eight little holes will make that much of a
difference, but something isn't right. Have you watched the rocker gear
with the cover off while the engine is running? (messy, but sometimes
necessary)
Glen
> Bob,
> I'm not sure even slender pushrods are going to help that much. I
> talked to Gerard over the phone last night and we compared clearances in
> a standard 1275 block he has at his house and the tubular pushrod
> diameter. The hole in the block is only about 1/16 larger than the
> tubular pushrod. Would this clearance slow 20W-50 Penrite Running In
> Oil drainage back into the block? Gerard also mentioned that I am
> probably building up pressure in the valve cover (not vented) because
> the oil is not draining back into the motor, forcing oil to go the only
> place it can, down the intake valve stem on the intake stroke. This is
> why the blue smoke gets worse the longer the car is running. I can vent
> the valve cover, but it does not solve the problem of the slow draining
> oil and I will probably still get the blue smoke maybe just a little
> less. The Tubular pushrod is 5/16ths diameter and the standard stock
> solid 1275 pushrod is 1/4 inch diameter. Will 1/8th inch clearance
> drain THAT much better than 1/16th? That does not sound like it is
> enough to me, but this is what the stock pushrod runs in a stock block.
> Maybe as oil pressure drops during run-in coupled with the pressure
> relief of the valve cover it might get better, but why does the oil take
> so long to drain when it is filled up after an oil change? I think
> after all is said and done I will probably have to abandon the 1.5
> rockers and the Isky Tubular Chrome Moly pushrods and go with a stock
> 1.3 setup, not getting the full use of the 266 cam and ported head. Oil
> pressure is pretty high in this new motor, but limiting the oil to the
> rockers still does not address the drainage problem.
> Mike MacLean
> 60 Sprite
> 56 BN2
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