lifter galley crossover tube

yellow rose said

I'm saying the rocker feed is self limiting. You are saying it's an open hole, I'm saying it isn't. The flow is controlled by the leakage at the rocker, and oil to the adjuster. You can feed it with a 1 inch hole and flow and pressure will be the same.

Guys are blaming one thing when the issue is the other.

Click to expand...

I'm not trying to start an argument because all of this is good info and a good debate.

I highly disagree with you, YR. The oil at #4 is also pumped up to the cam and if it is grooved, that oil ends up feeding 1 cam bearing, the entire rocker shaft to include all 8 rockers and their adjusters. That's a big oil leak compared to the crank. So much that when you install some aftermarket rockers and shafts, they advise you may have to install a restrictor plug in the shaft pedestal to maintain oil pressure. Plus, the oil going into the crank as soon as it leaves the bearing has to fight against the centrifugal force of oil being thrown away from the crank centerline. Probably not much resistance in that aspect but these little things add up at a time where oil splits to the head and crank.

I'm not so sure on the timing aspect of it either. If I'm not mistaken, when you install the main bearing in the saddle, the oil port hole in the bearing is at 12:00, so that would correct any timing problem of the oil galley being drilled at 10:00 towards the passenger main galley.