T56MaxTorq
Well-Known Member
With that plug out or dislodged, the engine would see higher pressure from dirty oil, but would trash the bearings quickly. This would lower the pressure as the bearings wear out. explaining why the filter is clean.
I agree, dirt kills bearings, but I have seen three of four of this exact plug out failures the die in 2-3 hours of run time. Motors built in clean enviroments. I can’t imagine dirt is killing these bearings in that short of a period.
Seems counterproductive to design and manufacture a filter that would do its job in filtration, but when differential pressure is too high, the bypass opens and just dumps the debris into the exit passage.
agreed but your never wrong
There I fixed your post. lol
agreed on this subject Jabroni
The alternative, oil starvation, would be just as disasterous. Until the filter valve opens the debris is trapped in the filter material. There is no "backflow" to dislodge it. Take a filter apart.
If you got that much debris in your oil, you engine is ALREADY well on it's way to catastrophic failure. imhoR3 said the debris comes out. I figured that debris would be entrapped but looking online at a bypass filter breakdown, the oil flows past the filter media, so It’s only possible that debris could be picked up and forced in the system.
It should be designed so that the bypass isn’t even a function of the spin on filter, but rather the housing, like every normal differential pressure relief type system.
You may be right... all depends on the how well the restriction made by the cam's 'oil flow interruptor' manages flow.If the rocker shafts are on upside down, with stock rockers, pressure would be a little lower. 16 holes would be completely unrestricted
Looks like 8-011 for the WIX 51515:I think Fram HP and a couple Wix filters are the only ones that have a 22 psi differential pressure valve all the others are 12 psi and lower
You may be right... all depends on the how well the restriction made by the cam's 'oil flow interruptor' manages flow.
I just looked at a stamped rocker shaft from a '68 273 and the hole on top and bottom are the same size. Same on the adjustable rocker shaft I have here. So that restriction would not change. (Somehow I had the idea that the top hole was smaller.....??? Gettin' old....)
the O. P. does not have 273 rockers or shafts, he has stamped rockers. Dave Hughes said that as the rpms are up from idle there is a steady flow of oil up to the rockers, and I believe him, think about it, as the cam spins faster the flow is virtually full time. when a 340 shaft is installed correct, the oil outlet holes face down, and are partially blocked. If the shafts are upside down, the 16 holes face up and are wide open, lowering oil pressure
This is right out of the how to build stroker small blocks by a ChryslerWell, it might increase pressure but it does as jimjim says.... diverts the pump's oil output to the filter inlet passage. If the plug is out, the oil goes straight into the passenger side oil gallery. It won't loop back through the filter; the pressure where the plug was supposed to be will be a fraction of a psi higher than at the top where the oil filter outlet passage joins so oil won't flow backwards. I'd expect it to slowly purge the air out of the filter and then the filter will be just a static 'wart' on on the oiling system. Any oil drain back protection from the filter will be lost.
Seems like we have all been through this before somewhere... LOL deja vu all over again...
Well this is only my opinion but I believe without the plug the oil would loop and have no resistance so it builds no pressure. With the plug in there it forces the flow path to go through the filter and then into the motor where it encounters resistance. The pressure then would equalize on both sides of the plug which may be why the plug does not blow out. Just my opinion. The book may be wrong, I just wanted to share another reference.O.K. Duane that's what you get for reading a book, the book is wrong!
look at the oiling system schematic and tell me why there would be no oil pressure. Here is a picture of the bypass plug, I just makes the oil go through the filter if the plug was not there the oil would still go through the motor and still have pressure it just wont go through the filter.View attachment 1715207393