Originally Posted By: JellyBeanDriver
Originally Posted By: tratman2000
Bet those restrictive slits are to control the tearing issues should make less pressure on the media
I was thinking about that. Yeah it would do that at the sacrifice of also dropping pressure to the engine. Oil pump pressure relief is on the pump side (pre filter). As the previous poster wrote, I wonder what the delta pressure is across the filter at various flow rates.
If the oil filter becomes more restrictive, the oil pump will just work harder to maintain the same flow rate at the same RPM (ie, positive displacement pump). This will happen up until the oil pump goes in to pressure relief.
Here is typically what most good flowing oil filters will have for a delta-p vs flow with hot (200 F) oil.
Flow vs Delta-P
Originally Posted By: JellyBeanDriver
Speaking of flow rates, what flow would an engine need to keep the galleys pressurized at 45psi (guess) at 3000rpm?
It all depends on the total flow resistance of the engine's oiling circuit. I know GM V8 show about 30 PSI at idle (800 RPM), and build pressure of ~10 PSI per 1000 RPM. So at 3000 RPM, it would be around 50 PSI of oil pressure. Wild guess is the flow rate of the oil pump at 3000 RPM on a modern V8 would be around 4~5 GPM.