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oil pressure. what do you got?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by curtis151, May 17, 2001.

  1. curtis151

    curtis151 Newbie

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    i recently rebuilt my engine and my oil pressure isn't what i expected it to be.i'm just wondering what everybodys running cold and hot at idle with truck in drive...........
     
  2. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    In the mornings when everything is cold it runs above 45. Than after its all nice and warm and its running on the open road it'll drop between 45 and 30. What is yours reading. Using the stock gauge or aftermarket. The stock ones arent the most trust worthy.

    <A target="_blank" HREF=http://www.geocities.com/bigkern76>http://www.geocities.com/bigkern76</A>
     
  3. 86K5TrailBlazer

    86K5TrailBlazer 1/2 ton status

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    Well not that is a fresh engine or anything close, but my oil pressure is a solid 30 all the time.
     
  4. 8_YOUR_H2

    8_YOUR_H2 1/2 ton status

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    I have a high volume that runs about 65 pounds. After it warms up it drops to 45 at idle then shoots off the chart when I go
    Brent
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    Old motor, unknown age, mileage, parts, 30 psi+ cold, just under that hot idle, with 20w-50

    Dorian
    My tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
    No anti-theft measures on your truck? No pity when its stolen
     
  6. curtis151

    curtis151 Newbie

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    I'm running both a stock gage and a after market gage on a T-pipe.The stock gage is off.Cold start up i have 60 psi but when it warms up after about 20min it drops to 20 psi.(this is at idle and in drive)I know what the problem is I just don't to belive it...................Thanks for the imput
     
  7. Sparky87k5

    Sparky87k5 1/2 ton status

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    Mine runs about 50 on cold startup at idle and about 30-35 at idle when up to temperature (190). I run a stock new GM Z28 pump and 7 qt. pan with 10W40 oil.

    87 K5, D60 & 14FF, 5 sp & NP208 & 383 Vortec stroker. Build it Bulletproof and take it fishing!
     
  8. 1bad82k5

    1bad82k5 1/2 ton status

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    My 350 used to run about 35 to 45 all the time. I switched to mobil 1 synthetic, and now it runs about 40 cold and sometimes drops clear to 15 when it is hot. I am not concerned because i know the pump is not bad, and the engine only has about 40k on it. I guess it is just the oil. Synthetic runs out of the bottle like water, so i don't see that it would be any different in the engine.
    eric


    Hell, it don't really matter....it's just for my race car.
     
  9. mpascino

    mpascino 1/2 ton status

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    I had the same problem.... in my case it wasn't good. Turned out that my crank was bad, the journals were out of round. When cold I had 60 + psi pressure, once warmed up it started off being about 20 ish or so and as a week or two went by it decreased to zero at idle. All kinds of not nice noises begn to follow. Just keep an eye on it, I ended up having to do the low end of the motor again, kinda sux when it only had 500 miles on it.


    You call that dirty!?
     
  10. Sammy

    Sammy 1/2 ton status

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    Solid 30 all the time when warm. (though the needle vibrates. duh!)

    "K5 Grand GT Blazer Silverado in the Netherlands."
     
  11. Greek

    Greek Registered Member

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    In the cold winter mornings of New York I rread around 45. As the oil warm it goes to 30.
     
  12. ftn96

    ftn96 1/2 ton status

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    Running the manual required 5w30 w/ 150,000 mines runs at running temp, 45 while on the gas adn at idle 30.
    Speacking of which, I live in a hot humid climate area and much traffic and my manual says 5w30, would it hurt or be better to run 10w40 in the summer?

    Will work for beer, parts and tools.
    90-350TBI-TCI700-241-33"-10/12 bolt w/4.10's,
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  13. BillyBob

    BillyBob 1/2 ton status

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    my 87's origional motor (going on 114K) runs pretty low pressure. usually starts around 30PSI, then drops to just above 15.. and this is with 20W50 oil! I think that this is the beginning of a problem, or the gauge is just screwed up.

    <A target="_blank" HREF=http://billybob.coloradok5.com>http://billybob.coloradok5.com</A>
    If it ain't leaking oil, it ain't my truck![​IMG]
     
  14. muddin4fun

    muddin4fun 3/4 ton status

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    I heard that 10w40 was a screwy oil weight. I run 10w30 Valveoline all the time here in Texas.

    [​IMG]
    <A target="_blank" HREF=http://k5chevyblazer.homestead.com/home.html>http://k5chevyblazer.homestead.com/home.html</A>
     
  15. wayne

    wayne 3/4 ton status

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    I run 10w30 and have about 40psi cold and 30 when it is warm.

    <A target="_blank" HREF=http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html>http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html</A>
    <font color=blue>Happy Trails<font color=blue>
    <font color=blue>Wayne<font color=blue>
     
  16. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Ah, a fellow valveoline user. Can't stand that Penzoil junk.

    <A target="_blank" HREF=http://www.geocities.com/bigkern76>http://www.geocities.com/bigkern76</A>
     
  17. wakedog

    wakedog 1/2 ton status

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    Mine has a new gm 350 crate in it w/ 20,000 miles and i have the stock gauge. It run s at like 50 when i start up and at 60 when im on the gas or just drivin.
     
  18. CaptCrunch

    CaptCrunch 1/2 ton status

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    semi-worn motor runs anywhere from 40 -60 psi depending on temp and rpm. I like Valvoline oil (well duh they used to be one of my sponsers so I gotta like em... but they are the best IMO) I usually run 10w30 summer and 5w30 in the winter... although if I had a fresh engine that I cared for I'd run my 10W40 synthetic. Just my opinion here... but if you run 10w40 or thicker oil I'd definetly let the truck idle a few minutes before you take off because they usually are pretty thick cold on startup and don't lubricated real well cold... that or run that d@mn oil suppliment... arrggghh can't remeber the name right this second... Too much alcohol last night [​IMG]. I'll have to post it later...

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  19. angelglo

    angelglo 1/2 ton status

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    rule of thumb. just as long as you keep it above 10 psi for every 1000 rpm, you are fine. if you go below that, start saving money for a rebuild.
     
  20. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Another user here, too! Also hate the Pennzoil crap, too!
    My 454 runs right at 60 lbs. cold. When warm, it will jump around the 50 to 55 lbs. range.

    When In Doubt, Whip It Out!
     

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