The OE filter for my Audi has a bypass spec of 2.5 bar (36 psi). I know that means that if the pressure differential across the media is greater than 36 psi the bypass spring will start to open.
Does this mean that it takes a greater loss of oil flow/pressure to trigger the bypass to let unfiltered oil to the engine? If I'm thinking about this correctly, would that potentially starve the engine of oil whereas a filter with a bypass of 10 psi would at least send some oil through to the engine at a lower pressure diff?
I don't know if it really matters, but I envision oil flow volume decreasing when the oil is cold and viscous as it creates a greater PSID until it heats up and flows better through the filter element. I would think they would want the opposite so the turbos would always have an adequate oil supply, even though it may be unfiltered.
Am I on the right path here? Why would Audi spec a filter with such a high bypass setting?
Does this mean that it takes a greater loss of oil flow/pressure to trigger the bypass to let unfiltered oil to the engine? If I'm thinking about this correctly, would that potentially starve the engine of oil whereas a filter with a bypass of 10 psi would at least send some oil through to the engine at a lower pressure diff?
I don't know if it really matters, but I envision oil flow volume decreasing when the oil is cold and viscous as it creates a greater PSID until it heats up and flows better through the filter element. I would think they would want the opposite so the turbos would always have an adequate oil supply, even though it may be unfiltered.
Am I on the right path here? Why would Audi spec a filter with such a high bypass setting?