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Author Topic: what is the recomended oil pressure?  (Read 8604 times)

Offline 87454westernhauler

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what is the recomended oil pressure?
« on: June 27, 2011, 03:50:25 pm »
I havee an 80 c10 silverado with a 350 sbc. it holds about 25lbs. of oil pressure most of the time. what is the oil pressure level supposed to be at?
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Offline Grim 82

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Re: what is the recomended oil pressure?
« Reply #1 on: June 27, 2011, 04:08:29 pm »
At least 1psi per 100 rpm.
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Offline Captkaos

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Re: what is the recomended oil pressure?
« Reply #2 on: June 27, 2011, 04:19:39 pm »
minimum of 7lbs at idle and 1lb per 1000rpm.
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Offline 1979C20

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Re: what is the recomended oil pressure?
« Reply #3 on: June 27, 2011, 04:36:29 pm »
Quote from: Captkaos on June 27, 2011, 04:19:39 pm
minimum of 7lbs at idle and 1lb per 1000rpm.
Quote from: Grim 82 on June 27, 2011, 04:08:29 pm
At least 1psi per 100 rpm.
Is it 100 or 1000?
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1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline Captkaos

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Re: what is the recomended oil pressure?
« Reply #4 on: June 27, 2011, 04:45:46 pm »
1000, keep in mind what I posted is MINIMUM.  10-15lbs at idle is normal.
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Offline jaredts

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Re: what is the recomended oil pressure?
« Reply #5 on: June 27, 2011, 07:13:35 pm »
It does change though, right?  I wouldn't say the same number at idle and highway speed is normal.
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Offline Grim 82

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Re: what is the recomended oil pressure?
« Reply #6 on: June 28, 2011, 09:07:45 am »
Pressure should rise with rpm increase. At a minimum of 1 psi per 100 rpm:
700 rpm idle = 7 psi oil pressure
2500 rpm cruising = 25 psi minimum
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Offline 1979C20

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Re: what is the recomended oil pressure?
« Reply #7 on: June 28, 2011, 09:14:24 am »
Quote from: Captkaos on June 27, 2011, 04:45:46 pm
1000, keep in mind what I posted is MINIMUM.  10-15lbs at idle is normal.

This isnt making sense to me. Your saying 1lb per one thousand rpm. So a 800rmp idle would be .8lb? Grim makes sense, 1lb per one hundred rpm. 800rpm idle would be 8lbs.
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1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline 87454westernhauler

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Re: what is the recomended oil pressure?
« Reply #8 on: June 28, 2011, 12:03:56 pm »
grim that is pretty close to what it is, unless it is hot and idling very slowly and it does fluxuate with change in RPMs.
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Offline figure843

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Re: what is the recomended oil pressure?
« Reply #9 on: June 28, 2011, 03:01:01 pm »
x2 for grim!   ;D
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Offline Captkaos

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Re: what is the recomended oil pressure?
« Reply #10 on: June 28, 2011, 03:07:59 pm »
Quote from: 1979C20 on June 28, 2011, 09:14:24 am
This isnt making sense to me. Your saying 1lb per one thousand rpm. So a 800rmp idle would be .8lb? Grim makes sense, 1lb per one hundred rpm. 800rpm idle would be 8lbs.
7lbs MINIMUM at idle (600-800lbs) and MINIMUM of 1lb per 1000rpms.  So at 5000, you should have at LEAST 7 + 5x1= 12lbs
What Grim posted is normal/recommended.
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Offline 1979C20

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Re: what is the recomended oil pressure?
« Reply #11 on: June 28, 2011, 03:13:54 pm »
I understand now. I needed to see the whole equation. Thanks. 40-60 at idle wont hurt anything, right?
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1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline beastie_3

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Re: what is the recomended oil pressure?
« Reply #12 on: June 28, 2011, 11:11:50 pm »
No. My truck pumps 60 or so when cold at idle, then below 25 when hot.
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Offline Skunksmash

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Re: what is the recomended oil pressure?
« Reply #13 on: July 02, 2011, 11:50:04 am »
Yeah for some reason chevy's tend to change, at least that's what the gauge needle shows. Fords stay constant for some reason.
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Offline 87454westernhauler

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Re: what is the recomended oil pressure?
« Reply #14 on: August 22, 2011, 05:52:49 pm »
Just an update. Been working over 10- 12 hours daily for the last 3 1/2 months and have put about 6000 miles on it in that time and it gets a solid 25-30lbs of pressure going down the road and 45lbs when it is cold. This thing is a solid old truck and I just got done puting headers and chery bombs on strate pipes. ;D ;D ;D other than the exaust and changing the oil in it I havent had to many major issues with it other than gasa millage ;)
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86 c10 350 sbc 700R4 Daily Driver
79 gmc c20 350 th350
78 k1500 4x4 350 th350
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