Adjustable oil pump from t/a performance?
- Thread starter Mike70gtx
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Hi Mike I use that pump style on my 455. Yes screw in for more p.s.i all around. You may want to shoot for as low as 20 p.s.i WARM at 600 to 1000 R.P.M's. Never check or make changes when the oil is cold. Due to will read higher. Remember don't go crazy high to much strees on the rear main seal. At a high R.P.M. I set mine up for 30 P.S.I. warm at 1000 R.P.M's and have had no problems for ten plus years. Good Luck Ron.
Turbo1dr
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How does this kit make the oil pressure higher at idle? Thanks.
Lee Thompson
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False
That screw will not change your oil pressure once oil is hot !!!!
That screw will not change your oil pressure once oil is hot !!!!
Turbo1dr
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Not so simple...
Basically, the oil pump in our engines is too small to keep up with the internal "leakage" when the engine is idling. It's designed specifically to our engines internal clearances. It's also designed so that when the engine is idling the oil pressure drops to acceptable levels and then as rpm's increase the pressure rises. The spring will then "take over" and allow excessive oil pressure to bleed off at a given pressure...set by the tension of the pressure relief spring. The design is probably for fuel mileage and longevity of timing components from the factory.
The oil is only by-passed during cold start-up and high RPM's. Once the engine oil gets hot the pressure spring isn't by-passing the oil at an idle and lower rpm's. This is because of all the internal "leakage" in the engine. If you have a oil pressure gauge and it's going up and down while revving the engine the oil pressure is not being by-passed at all. Once the gauge stays steady and does not move then the oil is being by-passed...only at high rpm. As far as I know there is no way to manually set a desired oil pressure at an idle (other than bearing clearances). The pump is simply too small.
Now, lets say you can get a oil pump that is very big...meaning that it has a lot of volume. This type of pump can actually pump more oil than your engine can leak "internally". Meaning that if there was a pump available that could hold your oil pressure at 70psi during idle AND at high RPM when the oil is HOT...that would be a pump that's too big for the engine. The high volume oil pump kits available today will make your pressure higher at idle because it has more volume to pump into the engine. If there was a kit that DOUBLED the gear size then you would have a pump that could pump even more volume at an idle but you wouldn't have more pressure at high rpm's.... the by-pass spring will still keep the high RPM pressure at it's desired set point.
I have heard that in the older days...much older...some engines came with a oil pump that had so much volume the oil gauge would read the exact same pressure whether it was idling, at high rpm or when it was cold. It could pump enough volume and by-pass enough oil to maintain a certain pressure at all times.
Basically, the oil pump in our engines is too small to keep up with the internal "leakage" when the engine is idling. It's designed specifically to our engines internal clearances. It's also designed so that when the engine is idling the oil pressure drops to acceptable levels and then as rpm's increase the pressure rises. The spring will then "take over" and allow excessive oil pressure to bleed off at a given pressure...set by the tension of the pressure relief spring. The design is probably for fuel mileage and longevity of timing components from the factory.
The oil is only by-passed during cold start-up and high RPM's. Once the engine oil gets hot the pressure spring isn't by-passing the oil at an idle and lower rpm's. This is because of all the internal "leakage" in the engine. If you have a oil pressure gauge and it's going up and down while revving the engine the oil pressure is not being by-passed at all. Once the gauge stays steady and does not move then the oil is being by-passed...only at high rpm. As far as I know there is no way to manually set a desired oil pressure at an idle (other than bearing clearances). The pump is simply too small.
Now, lets say you can get a oil pump that is very big...meaning that it has a lot of volume. This type of pump can actually pump more oil than your engine can leak "internally". Meaning that if there was a pump available that could hold your oil pressure at 70psi during idle AND at high RPM when the oil is HOT...that would be a pump that's too big for the engine. The high volume oil pump kits available today will make your pressure higher at idle because it has more volume to pump into the engine. If there was a kit that DOUBLED the gear size then you would have a pump that could pump even more volume at an idle but you wouldn't have more pressure at high rpm's.... the by-pass spring will still keep the high RPM pressure at it's desired set point.
I have heard that in the older days...much older...some engines came with a oil pump that had so much volume the oil gauge would read the exact same pressure whether it was idling, at high rpm or when it was cold. It could pump enough volume and by-pass enough oil to maintain a certain pressure at all times.
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