Thread: oil pressure?

What does the workshop manual indicate it should be?

30 Psi when? Cold idle, hot idle, cold revs, hot revs? All makes a difference.

I've driven hundreds of thousands of K's with oil pressure little above that (hot, cruising RPM). It's plenty with good quality oil, eg Penrite HPR30. Never wrecked a bearing in 30 years.

My first oil pressure gauge went to 100psi, people used to look and say "That's low oil pressure!" I fixed it when I put in a 60psi gauge that then read slightly over half. "That's good oil pressure!"

Originally Posted by brend0n

The gauges only reads 30psi, that seems awfully low?

Thats actually good ....




The Haynes manual quotes normal oil pressure as the following for 3.5 & 3.9 V8

25 psi at idle ...and 35 psi at 2500 rpm


Cheers
Mike

ok thanks guys.
the manuals at work that why i was asking..
its at idle and warm.

I'm using penrite HPR also, so cheers for the info guys

Originally Posted by mike 90 RR

The Haynes manual quotes normal oil pressure as the following for 3.5 & 3.9 V8

25 psi at idle ...and 35 psi at 2500 rpm

Exactly. That's why I asked what the manual stated. I knew it was relatively low.

Originally Posted by p38arover

I knew it was relatively low.

I had a eye popping "there goes me wallet" moment, when I first hooked up the oil gauge ... calmed down, after I read the book

Brendon
daily sits around 80psi, the others 95-105 (but thats a special one
What ? All you need for oil pressure is around 10PSi/per 1000RPM ,I think your 80 PSi , and 95-105 PSI is actually KPA , so divide them by 7 which is 10 PSi and 12 to 14 PSi .
If it had more than 75PSI it would blow the Oil filter off
Excessive oil pressure is ususally indicative of excessive restriction somewhere or a very faulty relief valve . Do you realise the amount of force that 100 PSI represents at the main bearings , you would be jacking the main caps off !!! apart from the great parasitic losses at those pressures , Never confuse pressure with Flow , Flow is what is important , the resulting pressure is only the resistance to Flow . put simply.