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post #1 of 73 (permalink) Old Feb 15th, 20, 7:31 AM Thread Starter
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Todd
 
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Oil pressure

What is a sufficient oil pressure for a 454? I purchased a chevelle 3 years ago with a 1986 454, not a lot of miles on engine under 10,000. the engine runs great. I was running 10/40 oil but the pressure was about 10psi at hot idle and would not go past 40 psi giving it throttle. So I decided to put 20/50 in the engine that brought it to 15psi and a little over 40psi. I was thinking removing the oil pan and replacing oil pump with a mellon high volume pump, but will a make matters worse? Any skilled thoughts would help.
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post #2 of 73 (permalink) Old Feb 15th, 20, 7:38 AM
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Re: Oil pressure

I'd say minimum 10psi at idle, and something like 40 at 2k.

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post #3 of 73 (permalink) Old Feb 15th, 20, 9:18 AM
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Re: Oil pressure

My stock 307 has 40 psi at idle. Goes up to 50 psi around 2 grand. 10-15 psi seems to low too me. I am no expert (esp about big blocks) but I did stay at a Holiday Inn last night.
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post #4 of 73 (permalink) Old Feb 15th, 20, 9:32 AM
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Re: Oil pressure

I always thought 20 for a minimum, and 10 lbs per 1000 rpm..........

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post #5 of 73 (permalink) Old Feb 15th, 20, 10:02 AM
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Re: Oil pressure

I thought the manual stated 10 at idle. 20 at idle what I usually see.

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post #6 of 73 (permalink) Old Feb 15th, 20, 10:04 AM
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Re: Oil pressure

there is a few variables to consider like bearing clearances and such.
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post #7 of 73 (permalink) Old Feb 15th, 20, 10:05 AM
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Pressures seem fine to me.
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post #8 of 73 (permalink) Old Feb 15th, 20, 2:28 PM
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Re: Oil pressure

Todd,
It should be fine. One thing you might want to do is verify the gauge is correct by plumbing in a mechanical gauge temporarily as a check. I would personally put the 10W40 back in. As long as it stays where it is and does not start going lower I wouldn't worry about it much. That year engine probably never had much more than 40 lbs hot even when brand new.
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post #9 of 73 (permalink) Old Feb 15th, 20, 4:27 PM Thread Starter
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Re: Oil pressure

I have tried 2 different oil gauges they read the same. I will put the 10/40 back in and if the gauges reads less than 10psi what should I do, replace oil pump with a high volume oil pump?
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post #10 of 73 (permalink) Old Feb 15th, 20, 4:45 PM
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Re: Oil pressure

do you hear any odd noises? if not find something else to worry about. there is a reason why car makers used indicator lights in most cars and cars with gauges they had vague markings.
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post #11 of 73 (permalink) Old Feb 15th, 20, 4:47 PM
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Re: Oil pressure

Quote:
Originally Posted by tday815518 View Post
I have tried 2 different oil gauges they read the same. I will put the 10/40 back in and if the gauges reads less than 10psi what should I do, replace oil pump with a high volume oil pump?
You could change out the oil pump spring for one that will give you higher pressure.
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post #12 of 73 (permalink) Old Feb 15th, 20, 5:18 PM
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Re: Oil pressure

My 454 runs about 10psi at idle & about 40-50 when I get on it. Been running fantastic for years.

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post #13 of 73 (permalink) Old Feb 15th, 20, 5:31 PM Thread Starter
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Re: Oil pressure

Changing the spring sounds like a good idea. I will be replacing the rear main seal, so I will have to remove oil pump. Which spring should I use?
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post #14 of 73 (permalink) Old Feb 15th, 20, 6:08 PM
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Re: Oil pressure

Quote:
Originally Posted by tday815518 View Post
Changing the spring sounds like a good idea. I will be replacing the rear main seal, so I will have to remove oil pump. Which spring should I use?
I installed the purple 52psi springs in my 461, plenty of pressure at idle and high rpm. Chevron Delo 15W-40 oil.

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Last edited by pnugene; Feb 15th, 20 at 6:10 PM. Reason: Added text
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post #15 of 73 (permalink) Old Feb 15th, 20, 6:27 PM
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Re: Oil pressure

Changing the spring has no bearing on idle oil pressure unless it's broken or collapsed and the valve is open which isn't the case here since you have 40 psi. A stiffer spring will raise the high engine speed pressure. Right now it opens at 40 psi. That said 10 psi is right on the ragged edge. I would try another gauge like suggested. If that's good you need one of 2 things. Less clearance or more pump capacity. Or thicker oil. 3 things I guess.
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