Okay,
so this is internet forum? I get that after reading this.
Op question was answered at posts 6 and 7.
Then I see only few posters in this thread actually understand how oil filter works, I'm talking about so called full flow, modern times engine pressurised filters widely used since what, fifties/ sixties?
Do you guys actually believe that millions and millions of vehicles out there get unfiltered oil thru them all the time? Really???
just a little knowledge could be a thing here?
Well, I try.
Oil filter between oil pump and engine got exactly same pressure as rest engine, say 50psi.
Bypass valve inside filter got this same pressure BOTH sides of it. Valve only opens if pressure difference between inlet and outlet side is big enough.
NOTHING TO DO WITH ACTUAL OIL PRESSURE/ FLOW. That example someone posted 15-20 lbs is actually biggest number I've seen. It depends only filter flow capacity and is designed after that. So again: OIL FILTER BY PASS VALVE IS NOT OPEN WITH 15-20 lbs oil pressure!!!
It is safety feature, rarely ever opens. Situations where it could open are:
Cold start freezing weather with too thick oil say 60W.
Something like 50000 miles or more with same filter and it gets choked.
If there is not oil filter bypass, filter will explode with these extreme situations.
Please read this excellent post again, this is correct information:
Quote:
Originally Posted by 69a
This is the 100% style filter he is asking about.There is NO unfiltered oil going to the motor. Some filters have an internal pressure relief that bypasses the oil internally if the filter is blocked. You need this feature! I use a Z9 or equivalent, it has a pressure relief that opens when the pressure between the input and output differs by more than around 10psi (this will have no effect on the pressure going to the engine) It also has an anti-drain back valve which is good on a remote mounted filter. Fit your oil pressure gauge after the filter.
I have bought Two of these. One from Motor City and the last one from Goller's Hot Rods. gollershotrods.com
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