Oil pressure, what's normal ?
Racer
Joined: Jul 2008
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From: Youngstown NY
Thread Starter
Race Director
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From: SE Pennsylvania
St. Jude Donor '03 thru '26
Oldtimer
So said . . .
Guys have told me that you need about 10 PSI for every 1000 RPM. Does that sound about right, and what do you think of Hi-Volume oil pumps ? Good or bad ?
I ask because I have a lot of boat marina's here with I live, ( You can see the Delaware River from my porch,) But some of the guys who overhaul a lot of the engines in the bigger 35+ foot boats that too much pressure can cause some of the engine to start leak oil where a stock pump wouldn't except that fault. But it all depends on what kind of build you want in the engine/s'
But most of the bigger boats run 454 V8, and the older boats have 327 V8 in them.
I ask because I have a lot of boat marina's here with I live, ( You can see the Delaware River from my porch,) But some of the guys who overhaul a lot of the engines in the bigger 35+ foot boats that too much pressure can cause some of the engine to start leak oil where a stock pump wouldn't except that fault. But it all depends on what kind of build you want in the engine/s'
But most of the bigger boats run 454 V8, and the older boats have 327 V8 in them.
Last edited by killain; Dec 31, 2015 at 04:16 PM.
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Race Director
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From: SE Pennsylvania
St. Jude Donor '03 thru '26
Oldtimer
Oil . . . I was just wondering
I was just wondering I have about 12 psi at idle in drive and about 35 @ 65 MPH or 2300 RPM. I have a stock 350 and it's a 77 Corvette, the lowest in the horsepower years where the government had it's talons deep in GM and all other manufactures to the point where some of the truck engines were more able to power a 3400 pound car.
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Thread Starter
Race Director
Joined: Aug 1999
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From: SE Pennsylvania
St. Jude Donor '03 thru '26
Oldtimer
Thank you !
Thank you and have a great new year, May your health sustain you onward and outward. Happy New Year. And I'm able to be a designated driver if you are near me. Philadelphia area. And this year I have been blessed now with 30 years sober. And there was a time I didn't think I could make it 30 minutes with out a drink. Be well !
Race Director
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have you considered testing the accuracy of your gauge by renting or buying a hand held pressure gauge? you make no mention of what oil you use but may want to consider a 10W40 with a zinc/phos additive.
Cruising
Joined: Dec 2014
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From: Apollo Beach FL
I am about the same as Diehrd on my 77. It stays about 30-35 at idle and 70 while running. I changed the breathers and vacuum lines recently when I redid the carb and now have a smaller breather and it bumped up about 5 psi while running to 70.
Burning Brakes
Joined: Aug 2011
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From: Redding California
Congrats on the 30 years brother!!!
Yeah, she's got 139.000 on the clock, but I have had a lot going on and I'm thinking of getting a GM crate engine to replace the tired L-48. But it don't knock or burn too much oil, so I'll hold on. It's paid for and I keep it in one of my garages.
Thank you and have a great new year, May your health sustain you onward and outward. Happy New Year. And I'm able to be a designated driver if you are near me. Philadelphia area. And this year I have been blessed now with 30 years sober. And there was a time I didn't think I could make it 30 minutes with out a drink. Be well !
Thank you and have a great new year, May your health sustain you onward and outward. Happy New Year. And I'm able to be a designated driver if you are near me. Philadelphia area. And this year I have been blessed now with 30 years sober. And there was a time I didn't think I could make it 30 minutes with out a drink. Be well !
Thread Starter
Race Director
Joined: Aug 1999
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From: SE Pennsylvania
St. Jude Donor '03 thru '26
Oldtimer
Burning Brakes
Joined: Jul 2009
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From: A town SC
I have a 434 sb thats currently moth balled. I have nothing to put it in. It has dynoed 785 hp at the flywheel. I took my time blue printing and was meticulous with the clearances. I built the motor on the tight side and wound up with some crazy high pressures. I personally dont mind high oil pressure as if you hurt the motor it will show fairly easy. It is however rough as hell on bronze dist gears and ac delco oil filters.
Idle cold 1100 rpm/ 90 psi
3500 rpm cold/ 125 psi
Idle hot/ 70 psi
3500 rpm hot/ 95 psi
Idle cold 1100 rpm/ 90 psi
3500 rpm cold/ 125 psi
Idle hot/ 70 psi
3500 rpm hot/ 95 psi
Thread Starter
Race Director
Joined: Aug 1999
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From: SE Pennsylvania
St. Jude Donor '03 thru '26
Oldtimer
Help. . . I need some technical help.
Thank you !
Drifting
Joined: Mar 2011
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From: on Barnegat Bay Joisey
Just acquired a '74 L48 with 38K original on the clock. Would appreciate your thoughts on what viscosity and brand of oil to use.
Please excuse using this thread but while your on the subject.....
Please excuse using this thread but while your on the subject.....
Melting Slicks
Joined: Mar 2005
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From: Midlothian VA
Thread Starter
Race Director
Joined: Aug 1999
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From: SE Pennsylvania
St. Jude Donor '03 thru '26
Oldtimer
Oil Loyalty ?
Back in the seventies, there was a oil manufacture who mixed Graphite in with the 10W30 weight oil and I assumed it seemed like a good idea. But after a year you had an engine with it's oil galleries clogged solid. The blocks and heads had to soaked in solvent to break the graphite loose and then flush the CRAP OUT. Then you can get on with a rebuild.
Drifting
Joined: Mar 2011
Posts: 1,693
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From: on Barnegat Bay Joisey
Sorry OP for all this chatter..perhaps I should have started a new thread.