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iTrader: (17)

I think the previous owner installed a High volume Hight psi oil pump on my 355. On start up it idles at like 65 psi when the car runs a normal temp it will go down to maybe 50 if I am lucky. If you get up on it the gauge pegs out to 90+

I know the pros and cons of a high volume pump. However, I have a roller cam and stock oil pan and I am wondering how worried should I be? Should I worry about starving my motor?

Sonix

iTrader: (1)

I used a normal pump (non-high volume), with a high pressure spring. Cold start, with 10W30 oil, is pegging the gauge, at 65ish psi. After it warms up it'll go down to *maybe* 40psi. That's at a 750RPM idle. Anything above that, the gauge is pegged. I don't think i'm getting nearly 90psi oil pressure, but my motor runs fine, so I wouldn't worry about it.

What viscosity oil are you running in that?
perhaps the clearances are somewhat tight or something, that would help boost up the pressure I'd think.

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iTrader: (17)

I run 10w 30 full synthetic.

AtomicTruck

That much oil pressure is not necessary, especially with 10-30 synth. I would be concerned if it was my engine. How many miles are on the motor?

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iTrader: (17)

less than 30k its a fully rebuilt motor.

1989GTATransAm

iTrader: (3)

Is the pressure relief valve working properly?

jamon8

iTrader: (3)

is this a true measure of the oil preasure with instumentation or just what the gauge(laughable) is telling you

with that amount of preasure you should be able to take the oil filler cap off and get a water fountain effect

bobdole369

no joke 90psi should hit you in the face. Get a real gauge before you worry.

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iTrader: (17)

I'm sorry I thought autometer was a good brand... oh you do really think I would give you an 90 psi reading on the stock gauge that pegs at 60?

I am not willing to open my oil cap and rev up my engine unless of course someone was going to detail my engine for me.

Sonix

iTrader: (1)

I can idle my motor at 45/60psi (hot or cold), and not get hit in the face with oil. That's a 1 3/4" hole, offset from the pushrods, which are shooting up the oil. You can rev it up and maybe get a little splash come out.

I think 90psi is kinda high though, mine is pegged, but I don't think it's all that much over 65psi or so.
Some people remove their bypass spring on their oil filter mount, such that oil only goes through the filter. I hear that brings up your pressure to the 80psi range. Just run a good quality filter.
Search on TGO for people who've done that, see what the consensus is on it. (I honestly don't know, just know that it's been discussed before in that reference).

Maybe Vader or sofakingdom will give some insight on this, you've piqued my curiosity.

Air_Adam

My 350 has had oil pressure of around 65psi cold and about 40 at idle warm for the last 4 years, and I've never had a problem because of that. Near redline, fully hot, my oil pressure is around 75-80psi. This is measured with a mechanical guage as well, so I know it to be fairly accurate. I do use a heavier oil than most though... I use Rottella T diesel oil in my engine. Its a 15w40 oil.

krly79

I'm running a moderately built 327 and I have a caninster to spin on oil filter conversion plate. It has the bypass removed and a HV pump with milodon 7 qt pan. If I get on it with out full warming it up, my gauge pegs out at 100 psi. Otherwise it will run 70-80 psi warm when I'm in it hard to 7K, but otherwise it runs about 60 psi crusing and like 40 psi idle.

Edit: All measured with a mechanical gauge.

AtomicTruck

An engine only needs a certain amount of oil pressure to acheive proper lubrication...(another thought popped into my head just now but I'm going to leave it there.

The amount of pressure depends on engine wear and system efficiency. Once you reach the proper pressure needed any more pressure is just overkill and will cause other problems. Very high oil pressure is hard on distributor and gears, and oil pump drive shaft. It also causes more heat generation and takes more power to maintain that high pressure. These two things are very small in comparison but they are unnecessary.

At 30K miles your engine should be broke in nice. I expect higher than normal pressures in new engines and a slight loss once it is all broke in. Now this is just my opinion so take it however you want... a daily driver, even one that is drive hard now and then, doesn't need any more than 50 psi oil pressure (provided the engine is in decent shape, and not new.)

10 psi per 1000 rpm is the MINIMUM number that I use (again this is just my opinion) with no less than 20 psi at idle. These numbers would represent an almost ***** out stock class circle track engine.

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iTrader: (17)

I completely agree, the pump is overkill. I never said it was a good thing. All I asked is how worried should I be, and I do not think I have much to worry about. I took my mechnical gauges out today and replaced them all with some new electrical ones. (mechs were mounted in the cowl of my hood) PSI still exactly the same. Oil is not seeping out of the dip stick, and I took out the oil cap and put a rubber cork in it and it hasnt popped out yet. Two gauges with the same readings. Perhaps it is high psi and not high volume.

I understand the cons, as I posted them in the 1st post. Thanks though.