This has bothered me much with all of the talk about restrictive filters vs. high flow filters.
First, I believe we all agree that the oil pump is a positive displacement pump, so it will pump the same amount of oil regardless of the restriction. This oil will go to either:
1) Oil filter
2) Oil filter bypass (let's assume SBC bypass in block)
3) Oil pump bypass and back to the sump
So, let's say the oil filter is plugged. The oil is still going to go through the filter bypass valve and the bearings will still see the same oil pressure until the pressure reaches max-pump-psi - filter-bypass-psi.
So, let's say a SBC has a pump bypass setting of 60psi and the filter bypass is 8psi.
Worst case, the plugged filter scenario is only allowing 52psi vs. 60psi of a fliter which does not bypass at all. Again, the difference is only once the oil pump begins to bypass. So wouldn't it be wise to put in a higher psi bypass spring?
Can anybody please help me understand how a filter can affect the oil pressure when not near the max pressure of the pump?
First, I believe we all agree that the oil pump is a positive displacement pump, so it will pump the same amount of oil regardless of the restriction. This oil will go to either:
1) Oil filter
2) Oil filter bypass (let's assume SBC bypass in block)
3) Oil pump bypass and back to the sump
So, let's say the oil filter is plugged. The oil is still going to go through the filter bypass valve and the bearings will still see the same oil pressure until the pressure reaches max-pump-psi - filter-bypass-psi.
So, let's say a SBC has a pump bypass setting of 60psi and the filter bypass is 8psi.
Worst case, the plugged filter scenario is only allowing 52psi vs. 60psi of a fliter which does not bypass at all. Again, the difference is only once the oil pump begins to bypass. So wouldn't it be wise to put in a higher psi bypass spring?
Can anybody please help me understand how a filter can affect the oil pressure when not near the max pressure of the pump?