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Oil Pressure and Water Temp

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by TXsizeK5, Aug 25, 2002.

  1. TXsizeK5

    TXsizeK5 1/2 ton status

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    Whgats normal oil pressure at idle? 900rpm
    And its supposed to increase as you accelerate right? What should the max psi be when accelerating?
    Also what water temp is considered overheating? Thanks
     
  2. dremu

    dremu Officious Thread Derailer Premium Member

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    Mine tend around 30psi at idle, up to 45-50ish at speed. Depends on the motor oil; thicker (higher weight #) will prolly register higher, as the pressure is just resistance to flow, right?

    Temperature-wise, if you go over half-gauge something is wrong, IMHO -- though this of course depends on ambient temperature. In 110F Arizona you'll prolly be running hotter than me in 80F California, or somebody in 40F Alaska ;-)

    My '74 keeps pushing over half-way, almost to 3/4. It needs a new radiator or water pump, I fear.

    My '77 runs about 1/4 gauge all the time. Woohoo, one less thing to deal with (just bought the truck and everything else is broke, seems like ;-)

    -- A
     
  3. amm888

    amm888 1/2 ton status

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    my '76 stays less then a 1/4 on the temp gauge, so far all the time.
     
  4. TXsizeK5

    TXsizeK5 1/2 ton status

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    what is that about?
    190F? thx
     
  5. twenty_below0

    twenty_below0 1/2 ton status

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    as far as pressure I would say as I have heard here on the forum 10 lbs. for every 1000 rpm's, I just built a long rod sbc 358 with Lunati crank and Crower rods,Blue printed and Balanced and all clearance's checked and "rechecked", my psi at 1000 rpm's is 18 psi.. at 2500 rpm's is 55 psi... 4500 rpm's 80 psi and temp runs at 180. which I have found to be half way between the quarter and half marks on a factory guage.
     
  6. jimmyjack

    jimmyjack 1/2 ton status

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    My blazer for yrs and yrs used to stick at 30 NO MATTER WHAT. When I replaced the motor it would peak at 60 and go as low as 20-30. As far as water temp, mine usually runs around 180 but goes as high as 210 or so with the AC and stop and go driving and highway driving in the summer when the (real) temp is around 120.
     

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