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I know there are hi-volume oil pumps, and hi-pressure oil pumps , BUT , how do you get either without the other ? I also hear that hi-P is better than a hi-vol becase it won't pump all the oil to the top of the motor.
 

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High volume pumps use a taller gear to move a bigger volume of oil.

The high output or high pressure pumps use a higher tension spring to increase the pressure.

High volume pump robs a little bit more power. It takes a lot of RPM to starve the sump, but a high volume will do it quicker than a stock volume.
 

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The high pressure pump has a special application such as using remote filters located out away from the motor. As the distance grows the oil pressure drops so you need to increase oil pressure to compensate for the drop caused by the length of the oil lines.
 

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Ok, horespower draw issues aside, are there any disadvantages to running a lot of oil pressure, like 45 psi at 2000 rpm?
 

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Pressurizing the oil more than necessary will heat the oil and it really does not help the bearings anyway.
 
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