Yeah, I forgot about pressure fed lifters. I don't usually use them. But yes, they need oil too.
If i'm modifying the oiling system I stop the lifter leaks.
I have never ever hurt a main bearing and Hurt a ton of rod bearing. If you are hurting main bearings there are other issuers and its not oil velocity.
Comp lied. Every roller I've ever seen from Comp has grooved main journals. In fact, I can't think of a brand of roller cam I've run that wasn't grooved. If you have one, I'd love to see the picture and I'm not talking about HR cams.
The lifter leaks are a big deal because all those leaks are stealing oil from the bearings. Those need to be stopped first.
Again, in a CONSTANT FLOW system once the passages are filled and the pump is keeping up you can plumb 10 hoses into a gallery and it won't change flow one iota. NADA. It can't because the internal leaks control flow. And whenever the bypass opens the pump is beyond keeping up. So adding extra oil from another source doesn't do anything. It can't.
I made a call this afternoon and cashed in a learning chip.
I'll sum it up.
Running two columns of fluid at each other will cause at whatever the two meet ZERO flow.
And If the pressure is different or if the pressure changes that point where there is no flow will move in the tube. And he said if it lands over a feed hole to the mains it can actually "wobble" back and forth over a feed and and oil will not go down to the mains.
And he said what I told 92b and that is so what if we are wrong. It doesn't have a damned thing to do with oiling the crank. He came on here and read a page or two of this and and said what I have been saying for decades. And that is velocity is NOT the issue.
Do you how many times I've had an engine come in with a crossover tube and not a damned thing else was done? I can't say for sure but I took my first one off in about 1985. And I got it dropped in my lap because it ate rod bearings like lifesavers. I took it off, tubed it and off he went. He never hurt another one.
And that's my point. The crossover isn't magic. It serves a purpose but making the rods get oil ain't it.
Now I've lost my place and the Windows garbage has made my font so big I can't hardly read it.
I'm going to check my mail and see if yours is there.
Let me know if you got the email and if it’s readable. If anyone else would like at word
Thanks Duane. Give me a bit. I'm breaking in a new to me lap top and we are not seeing eye to eye.