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Old July 30th, 2009, 10:08 PM   #1
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Question oil psi ? 318 help

so my old motor was crap. compreshin was form 60 to 103 psi. so I found me a 318 motor to replace my warn out 318. the new 1 is a h.o. cop car motor. I took it home and took it a part new rings, rod and crank barrings, saels,ect..

Know its in the truck and runs good. But I think the oil psi is to LOW. What is the right oil psi at idle and lets go 2K rpm 4 a 86 318 rebilt?

p.s. I cant keep the air out of the tube for the oil gauge I've bled it 5 or 6 time in 400 miles. When I shut it off for the night by morning I got air.

thanks chris
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Old July 31st, 2009, 12:52 PM   #2
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sounds like a bad cam bearing. did you replace them?
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Old July 31st, 2009, 01:16 PM   #3
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I agree about the bearing(s). but for reference, I've always been told a rule of thumb for "too low" is less than 10psi for every 1k rpm. ie 30psi for 3k r's. If it's just a wheeler, and you aren't putting many miles/hrs on motor, I had good luck switching to a higher viscosity oil. Just my $.02. Good luck. And if you have any other reason to crack that thing open... replace those bearings.
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Old July 31st, 2009, 01:35 PM   #4
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what year 318? chrysler had a tsb for something regarding low oil psi. like bad sensor, bad ground, can't remember.

i had a 95 zj w/318, dash gauge was always relatively low. but actual under hood was good w/tsb fix.
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Old August 1st, 2009, 09:18 AM   #5
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I agree about the bearing(s). but for reference, I've always been told a rule of thumb for "too low" is less than 10psi for every 1k rpm. ie 30psi for 3k r's. If it's just a wheeler, and you aren't putting many miles/hrs on motor, I had good luck switching to a higher viscosity oil. Just my $.02. Good luck. And if you have any other reason to crack that thing open... replace those bearings.


i was hopping i was wrong when i was thinking cam bearing becaese i did not change them.

i do have 10psi for 1k with 10w30 and jest gotsome 30 wight for my 500 mile oil change
10psi @ 650rpm
35psi @ 3k
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Old August 1st, 2009, 09:20 AM   #6
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what year 318? chrysler had a tsb for something regarding low oil psi. like bad sensor, bad ground, can't remember.

i had a 95 zj w/318, dash gauge was always relatively low. but actual under hood was good w/tsb fix.

its a 86 and i have all sunpro gauges thanks thou
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Old August 1st, 2009, 10:51 AM   #7
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Put a 440 in it
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Old August 1st, 2009, 11:08 AM   #8
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I just put rotella T in my 360 Now I need to change the filter, its burning about 4 quarts a week..
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Old August 4th, 2009, 01:28 AM   #9
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Put a 440 in it
i doubt hes got a spare $500+ to pick one up there boss
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Old August 9th, 2009, 10:03 AM   #10
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Put a 440 in it
NO BRIAN I've got 2 much money in it now

so when we going wheelin Brian I'm allmost reddy
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Old August 9th, 2009, 10:14 AM   #11
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OK up date I've got 60psi in the morning (cold),15psi at idle (650) hot ,and hot running down the road I've got 40psi

I'm happy with the psi but 2 B happy I got 2 run straet 30 oil
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Old August 9th, 2009, 10:36 AM   #12
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Bronco ate its trans a month ago so Im starting my 5.0/c4 swap in a couple weeks..........oh,and it might have an exo next time you see it too
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