What is oil pressure at idle

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  1. richardgoesfast

    richardgoesfast Active Member

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    On my 1970 with 383 my oil pressure at low idle is 20 and if I take it up to about 1000 rpm (in neutral not on road) it goes up to 40. Does that sound right? Couldn't find any info on this anywhere, figured you guys would know. Thanks.
     
  2. quikbird

    quikbird Well-Known Member

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    Sounds pretty normal to me.
     
  3. richardgoesfast

    richardgoesfast Active Member

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    Thanks, appreciate the input.
     
  4. whayden2003

    whayden2003 Well-Known Member

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    20 @ idle is actually pretty good in my opinion.
     
  5. 69hemibeep

    69hemibeep Sponge Bob Square Wheels

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    Yep
     
  6. Russ69Runner

    Russ69Runner Well-Known Member

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    That is pretty darn good. :thumbsup:
     
  7. richardgoesfast

    richardgoesfast Active Member

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    Thanks, this is a real relief to me.
     
  8. Ranger

    Ranger Well-Known Member

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    That's right about where mine idles at.
     
  9. ‘69_Sunfire_RR

    ‘69_Sunfire_RR Member

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    Same here, my ‘69 383 idles at 20 when warm or about 185-200 degrees. Bring it up to 1000 rpm and it’s at about 40. When cold I get about 70 psi but just at startup. What degree thermostat you all running?
     
  10. richardgoesfast

    richardgoesfast Active Member

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    That really parallels what I'm seeing. Thought it was low because I have a 2015 Mustang which has a much higher pressure at idle. I'm still new to this car, and trying to get it back into running condition after living in someone's garage for a bunch of years. So, don't know what the thermostat temp rating is. I just fire it up and try to get it to idle.
     
  11. ‘69_Sunfire_RR

    ‘69_Sunfire_RR Member

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    I hear you man. For reference my wife’s brand new Tahoe idles at 20 and peaks at about 35-40 when driving (1500-2000) rpm. And that’s normal. Like you I’m used to much higher pressure but with my RR it just seems normal. I researched this a lot when I bought the car and everything I read parallels what we are seeing.
     
  12. Ranger

    Ranger Well-Known Member

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    180°
     
  13. richardgoesfast

    richardgoesfast Active Member

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    Thanks.
     
  14. moparchris

    moparchris Well-Known Member

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    The general rule of thumb is 10psi per thousand RPM its at. Oil pressure is measured at the end of the oil passages, so even if you had 1 psi idling hot then you would have enough because you probably have 20 psi at the main and rod bearings. As long as it comes up to 50 or so at shift RPM you are good to go. Most folks worry about oil pressure and want extra oil pressure like a savings account or something. It doesn't really work like that. Extra oil pressure is just straining the pump and causing extra heat in the oil. Oh and by the way coolant temp has very little to do with oil temp.
     
  15. ‘69_Sunfire_RR

    ‘69_Sunfire_RR Member

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    Thank you for this explanation. It makes great sense to me!
     

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