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oil pressure 50 at start up?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by the excuse, Dec 19, 2003.

  1. the excuse

    the excuse 1/2 ton status

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    i just put an autometer electric gauge in to tell my oil pressure on my carbed remanufactured 350. it reads 50 when i start it and im in so cal so its not exactly cold here. when i rev it up it maybe goes to 60 whats the deal? it this ok?
     
  2. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    That seems perfectly fine. The oil is cold, therefore it is thicker, making for more pressure. The pressure should come down some after the engine has warmed up.

    ...As a side note, when I first start my Duramax on a cold morning, the pressure is about 100psi... /forums/images/graemlins/eek.gif /forums/images/graemlins/grin.gif

    John
     
  3. lukebaby1

    lukebaby1 1/2 ton status

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    Are you using a stock oil pump?
     
  4. the excuse

    the excuse 1/2 ton status

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    i dont know i got the truck 4 months ago and it didnt have working gauges until now.
     
  5. BayouBlazer88

    BayouBlazer88 1/2 ton status

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    before I rebuilt my 350, I would get about 30psi at idle and about 45-50 at around 2500rpm. I put in a rebuilt 355 this summer and put in a brand new oil pump and pick up and now I get around 50-55 at idle and I'm sure its over 60 at anything over idle because the needle maxes out. And it's not a high volume, just a melling stock replacement pump from Autozone.
     
  6. R72K5

    R72K5 Banned

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    ive had a ton of chevies run peggeg over all the way 60 while warming up until are warm, but when are hot they barely run over zero at idle.
     
  7. 88Silverado

    88Silverado 1/2 ton status

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    Im in the High Desert up here. Winters in the 20's and summers in the 105+ degrees. My Blazer with lots of miles runs 60 at cold idle and about 35-40 when warm. It runs pegged (60) when driving no matter how hot or cold.

    My ElCamino with 15K on a new motor runs 50 at cold idle and 65+ driving when cold. When hot, it runs 45 and idles at 10-15.

    Im running 10-30 Mobil-1
    Rule of thumb is 10psi per 1000 RPM

    If I run Valvoline 10-40 Im lucky to get any reading on the ElCamino at idle when warm /forums/images/graemlins/crazy.gif
     
  8. fortcollinsram

    fortcollinsram 1/2 ton status

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    With my 454, I am running 10w-30 and when I first start it in the morning it idles at like 70psi...and tops out at like 85 when the revs get to like 2000. once everything is nice and HOTT, it holds 25psi at idle and 50 at 2000...

    Chris
     
  9. jjlaughner

    jjlaughner 3/4 ton status

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    50-55 at startup, 45 at cruising speed, and 15-20 at idle after its warm
     
  10. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    That is real good pressure.
     
  11. 87BrnRsd

    87BrnRsd 1/2 ton status

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    That sounds perfect to me. I have a newly re-built 355 (now) that runs about 55 psi on startup (will go to about 75 psi if you rev it up), but after I drive down the highway for a while, it goes to about 15 at idle. I would say yours is about perfect. /forums/images/graemlins/thumb.gif
    -Harrison
     

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