Originally Posted By: CATERHAM
Originally Posted By: OVERKILL
Is the filter before or after the oil pressure sending unit?
I'm pretty sure it's before although I'll have to check.
OK, because if you visualize the function of your oil circuit:
Scenario A:
Pump w/relief ----- Sender ---- Filter w/bypass ---- Engine
In the above scenario, the measured resistance as observed by the sending unit posed by the engine is quite literally "filtered" through the filter. So if the filter is able to offer more restriction than the engine and creates enough of a differential to open the bypass valve, you will have say 90PSI regulated by the pump relief on the filter side of the circuit, and whatever the resultant pressure is on the other side of the media downstream factoring in the differential event, which could be 80PSI.
However, in this scenario:
Scenario B:
Pump w/relief ----- Filter w/bypass ----- Sender ----- Engine
You are observing system pressure AFTER the filter has made its impact, so if we retain the same numbers as above for the sake of simplicity, the filter is seeing 90PSI regulated by the relief on the pump, but due to its inability to flow the volume it's seeing, there is a differential and a bypass event is occurring, resulting in an observed pressure downstream of 80psi.
So if you have scenario A, the Mobil filter is likely flowing MORE oil than your other filters. However, if you are Scenario B, that means it is posing a greater restriction and you are likely experiencing a bypass event.