Higher oil pressure-good or bad?

[turbovanman²]

This frequently comes up so it would be nice to have info on it, in one thread.

Are there any benefits to higher oil pressure over volume? IE stock pump that puts out 60 psi at 4000+ rpm compared to another stock pump that puts out 80 psi at 4000+ rpm?

I've always put the MP spring in stock pumps and never had any issues, ie gear or shaft wear running 15w40 diesel oil, synthetics etc but we are always being told not to run higher oil pressure as it damages the turbo etc? That I understand.

[Shadow]

I've only used the Chrysler pump and the Melling on mtrs we've built. 10w30 oil, never use the spring, never seen any problems. I've never taken out a turbo. Since you heard that it might be bad for the turbo, how many turbo's have you taken out? Might answer your Q right there!

[turbovanman²]

One but that was an error on my part, the rest were all carnage damaged, lol.

Like I said, this is kinda of a general info thread, as the 2.4 guys just posted up they run like 100 psi cold, and 80 psi hot, so it got me thinking and alot always ask about oil pressure,

[Shadow]

I would think you would have oil bleeding past the seals on a turbo if the preasure was too high. I have heard of this happening on non-turbo mtrs like Hondas.

[mock_glh]

Once you've supplied enough volume to supply all the parts, any more pressure will just be using more power to turn the pump, sometimes causing the drive gears to fail. In addition, the excess oil being pumped out will create windage and other problems. 50 or 60 psi should be plenty even for racing.

[Shadow]

Once you've supplied enough volume to supply all the parts, any more pressure will just be using more power to turn the pump, sometimes causing the drive gears to fail. In addition, the excess oil being pumped out will create windage and other problems. 50 or 60 psi should be plenty even for racing.

Zacly what I was thinking.....

[supercrackerbox]

Once you've supplied enough volume to supply all the parts, any more pressure will just be using more power to turn the pump, sometimes causing the drive gears to fail. In addition, the excess oil being pumped out will create windage and other problems. 50 or 60 psi should be plenty even for racing.

Yup.

Make sure your galleys are clean and the restrictor is in place when you assemble, stock pump, and you should be golden.

[wallace]

Wouldn't the higher oil pressure increase the shear resistance at the bearing surfaces at the cost of volume?

[Directconnection]

how can you increase the volume w/out increasing the pressure? (w/out changing anything but a pump )

[turbovanman²]

how can you increase the volume w/out increasing the pressure? (w/out changing anything but a pump )

Not talking about volume, which you have to increase the gear or housing size, this is simply done by altering the relief valve spring,

[wallace]

raising the pressure of the existing oil pump will reduce the volume of oil delivered in the system.

[Directconnection]

spring set the psi limit.... but your oil clearances set your oil pressure. Increasing oil volume through the same engine is increasing psi.

[wallace]

how can you increase the volume w/out increasing the pressure? (w/out changing anything but a pump )

We're not talking bearing clearances are we? I thought this was a discussion on oil pumps?

[turbovanman²]

spring set the psi limit.... but your oil clearances set your oil pressure. Increasing oil volume through the same engine is increasing psi.

We know that, this is simply asking if running higher oil pressure is good or bad or ?

Like I said in my first post, 60 psi vs say 80 psi with JUST changing the relief valve,

raising the pressure of the existing oil pump will reduce the volume of oil delivered in the system.

Didn't know that. I will add that my engine has zero bearing wear, not a mark except for the oil pump gear, which is my own fault.

[puppet]

spring set the psi limit.... but your oil clearances set your oil pressure. Increasing oil volume through the same engine is increasing psi.

I'm thinking Steve, that opening up the clearances slightly will increase volume without raising oil pressure. ... agree?

[Directconnection]

I'm thinking Steve, that opening up the clearances slightly will increase volume without raising oil pressure. ... agree?

Agreed

I've just never understood the difference between a high volume pump, and a high pressure pump (besides the different spring rate)

Think of it in terms like the airflow though an engine

[Shadow]

I will add that my engine has zero bearing wear, not a mark except for the oil pump gear, which is my own fault.

Don't your mtrs usually go BOOM before the first 1000kms? How much bearing wear were you expecting to see?

[1984rampage]

Don't your mtrs usually go BOOM before the first 1000kms? How much bearing wear were you expecting to see?

HAHAHAHAHAHAHAHAHA

[Shadow]

Come on Simon, I was just messing with you.

[turbovanman²]

Don't your mtrs usually go BOOM before the first 1000kms? How much bearing wear were you expecting to see?

Aww man, that's nasty,