LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

No PSI Gains After Oil Cooler Removal

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Old Jun 19, 2003 | 08:31 PM
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AENIMA95z28's Avatar
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No PSI Gains After Oil Cooler Removal

Well. today i finally pulled that oil cooler and guess what, Not a D*MN change in the PSI. Well i suppose ill throw it back on next oil change. Any thoughts to why my pressure didnt increase?
Old Jun 19, 2003 | 08:57 PM
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It wasnt clogged
Old Jun 19, 2003 | 09:02 PM
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probably wasnt but most people seem to have much higher PSI numbers than me so i was hoping it would. Guess thats a good sign for my engine though seeing how its a 95.
Old Jun 19, 2003 | 09:04 PM
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what psi do you normally have at idle and when reving? mine is right around 40 psi when idleing and goes up a little when reving. I dont have an oil coller
Old Jun 19, 2003 | 10:05 PM
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around 20 When Idling and 40 when reving
Old Jun 19, 2003 | 10:32 PM
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Cool

Originally posted by AENIMA95z28
around 20 When Idling and 40 when reving
Your fine. Mine only holds about 35-30 at idle when warm with a HV pump and around 45-50 when warm turning 2 grand at 65 mph

-Shannon
Old Jun 19, 2003 | 10:35 PM
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HV Pump ?
Old Jun 19, 2003 | 11:21 PM
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high volume
Old Jun 19, 2003 | 11:53 PM
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You want high volume, not high pressure, but as a couple of the guys already mentioned, your oil pressure is fine.
Old Jun 20, 2003 | 07:30 PM
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I agree that some on this forum want high volume, not high presure. However, I want high pressure, not high(er) volume. If I'm getting the high pressure, I'm also getting enuf volume.
Old Jun 20, 2003 | 07:47 PM
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Pressure is created by the resistance to flow. For example, the water flowing out of a garden hose has relative low pressure, but when you put your finger over the end of the hose, restricting that flow, the pressure within the hose increases and you see the result by increasing the distance the water travels as it leaves the hose. The resistance to oil flow Inside an engine is from the clearances of the bearing and lifter bore. Engines with increased clearances will require greater flow to maintain the same pressure. As the RPM of the engine increases more oil is required. The oil pump selected should be able to flow the volume of oil required to maintain the pressure desired. A relief spring within the pump relieves the pressure when it reaches the desired level. High pressure pumps have a higher pressure relief spring as also do most high volume pumps. The main disadvantage of using a pump with the ability to flow more than required by the engine resulting in this bypass opening is a very small loss of horsepower.
Old Jun 20, 2003 | 08:32 PM
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Where bouts on your dial is 20 and 40 psi? (half, red, 3/4 up etc). Us metric people have kPa instead i think
Old Jun 20, 2003 | 11:42 PM
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...Engines with increased clearances will require greater flow to maintain the same pressure. As the RPM of the engine increases more oil is required. The oil pump selected should be able to flow the volume of oil required to maintain the pressure desired...

You want high volume.....

So what are you saying, that used engines should use a HV pump? If street driven, or for most racing, no need to run clearances on a new/rebuilt engine large enuf to require a HV pump, with POSSIBLE exception being add ons that tap into main engine oil supply for their needs.
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