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Hot Oil Pressure At Rpm

tacker

By tacker,
in Engines & Forced Induction

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tacker Mentor

tacker

Posted
Posted

Ok guys,

i have done a search for hot oil pressure and i see that nissan say that for a rb26 the oil pressure at 6000 rpm should be 65 psi.

I have just installed a new engine and we are getting 65 70 psi at 8000 rpm and i am not sure that is enough. Think i might have a pressure relief valve problem with the oil pump.

This pump has not been touch since being removed from the old engine and its bottom end was perfect, just killed # 5 piston with a broken ring land.

I was told as a rule of thumb that 10psi for every 1000 rpm is that what i should be looking at?

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The Dan Grand Master

The Dan

Posted
Posted

65-70 and your engine will still survive but the factory pump still kicks out 80psi hot at 7000-7500rpm.

I wouldn't be overly concerned about it but keep you eye on it nonetheless.

And yes general rule with these engines is 10psi for every 1000rpm but it starts at 20-25psi at idle. Then add 10psi for every 1000 on top of that. 20psi at 2000rpm would be too low.

tacker Mentor

tacker

Posted
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Posted

we have good oil pressure at a 1200 idle when hot of 36 psi this is why we think it might be an relief valve problem, might need to put a bit thicker shim in it.

Going to pull engine out tonight and have a look at the pump seems strange to have good pressure at idle but a bit low up high not sure what else it could be.

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