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I have a 455 with .0035 on mains and .003 on rods and a hi volume oil pump and a canton oil pan and when i drive for a while on highway in Florida heat when i get off and stop at red light i will have 15ish pounds of oil pressure at 190 degrees but once i drive a few miles and it cools back down to 180 it will have 20-25 pounds oil pressure at the red light anyone try thick oil or lucas i run 20/50 oil now and wix filter or is this pressure normal
What kind of gauge are you using to get those numbers AutoMeter, IssPro, parts store cheapie, etc.? FWIW, I run Rotella T4 15W-40 in both of my Oldsmobiles.
What kind of gauge are you using to get those numbers AutoMeter, IssPro, parts store cheapie, etc.? FWIW, I run Rotella T4 15W-40 in both of my Oldsmobiles.
gauges are some old looking ones probably parts store gauges they where in the car when i bought it possibly could be gauge what should oil pressure be idling in gear at red light your thought its always been like this ive had the car for 2 years and drive it alot sometimes every day for weeks at a time and run it hard
If it's a parts store cheapie gauge I wouldn't worry about the reading. If you have a lifter tick or your OE oil pressure light illuminates then buy a high quality gauge to read your oil pressure. AutoMeter is preferable over IssPro or Glowshift.
Is there a problem with those pressures? Seems ok to me.
i didnt know if it was normal or not like i said its been like that for 2 years that i owned it and i show it no mercy so if thats mormal im ok with it would i like to see more yes weather i need it or not but if its normal i have no problem with it
Cut the filter open. If the filter is clean of debris, relax.
If it really bothers you, double check the accuracy of your gauge. If it’s accurate, you could go up a step in oil viscosity.
This topic is a common one in the Buick community. I don’t recall the guys name, but he was in charge of the Stage One program. When asked about idle oil pressure specifications, he said it needs “some”. In other words, if the engine had enough pressure to keep the Iight off, you have enough.
I see your point but it seems to affect pressure across the board. However the machining of these pumps has gotten really bad, so this is still just a band aid.
Last edited by cutlassefi; July 12th, 2023 at 04:45 AM.
It doesn’t affect idle pressure. It will only open sooner if it’s weak.
those gears look like they’ve been spun dry for a while ? I’ve found the clearances to be on the loose side which results in slow pressure rise and a low idle psi. Some have had .004 to .006. That’s way more than it should be.
i set it to .0015 to .002 , then run it on a main cap in a bucket with a gauge.
Last edited by CANADIANOLDS; July 12th, 2023 at 08:08 AM.
If you are not checking gear end clearance and resetting, you will have low hot idle pressure and a slow pressure climb. Bigger than necessary gear clearance doesn’t always mean a low relief setting…but it can.
it just takes more rpm to reach it
Last edited by CANADIANOLDS; July 12th, 2023 at 08:18 AM.
?
so what is the ideal oil psi for a 455?
I feel I have too much at 40 to50 on external guage
stock guage is always idle 3/4 to fully peged at 5k roller cam/ 455 stroker ( emgine b4 i bought)
?
so what is the ideal oil psi for a 455?
I feel I have too much at 40 to50 on external guage
stock guage is always idle 3/4 to fully peged at 5k roller cam/ 455 stroker ( emgine b4 i bought)
thats kinda what i was wondering is mine normal or what lol hot off highway idle in gear 15-20 normal driving in town idle in gear 20-25 and about 40 ish cruising around 55 mph
thats kinda what i was wondering is mine normal or what lol hot off highway idle in gear 15-20 normal driving in town idle in gear 20-25 and about 40 ish cruising around 55 mph
It doesn’t affect idle pressure. It will only open sooner if it’s weak.
those gears look like they’ve been spun dry for a while ? I’ve found the clearances to be on the loose side which results in slow pressure rise and a low idle psi. Some have had .004 to .006. That’s way more than it should be.
i set it to .0015 to .002 , then run it on a main cap in a bucket with a gauge.
Is that just dead headed at all times? I have a similar set up but I have a ball valve on it to adjust and restrict flow on the outlet side.
it has a bleed port valve..off if I want to dead head it.
tried to post a video of that but can’t for some reason
What kind of reading do you get right off the pump? I shimmed a stock Melling pump .250" and am getting 60psi off .003 rods but that's at the port. Curious how that purple spring does right outta the box at the main.
Highway driving heats up the oil the most. The sustained higher RPM does it.
Olds 455's are not known for having high hot oil pressures. It's just the nature of the beast with the engine size/design. Definitely not like a LS engine or other modern engines. As long as idle pressure rises quickly once you hit the throttle, it should be good. I've seen 455's with 10-15 psi hot idle and 40-45 psi hot cruise, live a long life. Just run quality synthetic 15w-50 weight oils and all should be good.
Engine temps and oil temps sometimes run hand-in-hand. Keep the engine temps under 190F and it will help with oil temps/pressure.
July 10th, 2023, 05:07 PM
