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SBC water pump

Discussion in 'The Hokey Ass Message Board' started by jan bogert, Jul 3, 2012.

  1. jan bogert
    Joined: Jul 11, 2011
    Posts: 655

    jan bogert
    Member

    does anyone know how many gallons per min. a stock sbc chevy water pump pumps? i was told by Dedenbear pumps, that it doesn't even pump 26 gallons a min. that doesn't sound right. what do you think?
     
    Last edited: Jul 3, 2012
  2. garcoal
    Joined: Nov 15, 2006
    Posts: 277

    garcoal
    Member

    it would vary by rpm
     
  3. jan bogert
    Joined: Jul 11, 2011
    Posts: 655

    jan bogert
    Member

    Dedenbear, says i would be ok with thier 26 gal. per min. pump on my 350 hp. 350 new alum. rad. electric fan
     
  4. jan bogert
    Joined: Jul 11, 2011
    Posts: 655

    jan bogert
    Member

    anybody else?
     

  5. mustang6147
    Joined: Feb 26, 2010
    Posts: 1,847

    mustang6147
    Member
    from Kent, Ohio

    I have a 750 hp 351 windsor in an off topic Mustang. I have a stock water pump and the moroso electric motor and belt set up, and it never over heats at the track.... Dedenbear is good stuff, do what you want, either way your fine.
     
  6. 26 gpm would handle a lot of water and would be much larger than the sbc water pump. In the apple, peach, pecan orchard business, the sprayers we use to put chemicals into the trees send back more gpm to agitate/mix the chemicals and control gun or jet pressure than what can cool an engine as is flows through.
    Too much flow will cause the lack of cooling capability because the coolant moves too fast to absorb and carry away heat.
     
    Last edited: Jul 3, 2012
  7. mikes29
    Joined: Aug 16, 2009
    Posts: 42

    mikes29
    Member
    from kentucky

    You got to factor in the thermostat also, it will slow or stop the water flow so it can cool in the radiator
     
  8. fab32
    Joined: May 14, 2002
    Posts: 13,985

    fab32
    Member Emeritus

    Try filling 26 1 gallon jugs with a water hose on full blast 1 one minute. I've got an engine run in stand that uses fresh water from an outside shop faucet (no radiator) so there is always ample cold water to avoid any overheating during the critical 1st 20-30 minutes of running. There is a temperatue probe on the outlet side with a faucet to regulate flow. I start with the faucet shut and as temperature builds I regulate temperature by opening the outlet a little at a time until the temp stabilizes at 180-200 for the duration of the break-in. The faucet is NEVER anywhere near full open even on a rather tight stock spec assembly.

    Frank
     
  9. kye
    Joined: Jul 2, 2012
    Posts: 8

    kye
    Member

    26 gpm is alot considering that it's just a crude impeller with alot of slippage available. The slippage around the impeller fins begins to really matter when you consider all the restrictions that it must pass through (i.e. block to head passages and the very un-aerodynamic thermostat itself.)
    I had a 425rocket (olds) that lost its water pump. the right one was substantially larger than the usual small block chev water pump, but the bolt holes and passages were the same.
    Long story short, I went with s.b.chev pump for $28 instead of $80 for the biggun. Had to search bone yards for a different pulley ($5 more) had no probs.
     
  10. kye
    Joined: Jul 2, 2012
    Posts: 8

    kye
    Member

    I'm skeptical of advise from the guy trying to sell me an electric water pump.
     
  11. Sure they're going to tell you that! They're the ones trying to sell you a freakin' $300.00+ water pump.

    Think with your dipstick Bogie!

    I'm running 5??+ horse in a SBC with a "stock" GM part numbered - cast iron water pump, a GM/Harrison radiator and a mechanical Flex-a-lite flex fan and never get above 195 degrees stuck in traffic or the staging lanes.

    Remember what they always say... K.I.S.S.!
     
  12. rockable
    Joined: Dec 21, 2009
    Posts: 3,026

    rockable
    ALLIANCE MEMBER

    First of all, this is a centrifugal pump, not a positive displacement pump. A positive displacement pump will pump a certain amount per revolution of the shaft regardless of pressure within its efficiency rating and design limits. A centrifugal pumps output will vary depending on inlet condition, rpm and resistance to flow (which creates pressure).

    You would need to know the rated conditions under which that pump can pump 26 Gpm. It is just like your garden hose. You can shut the flow completely off, which is what the thermostat does or you can choke it down and modulate the flow, which is what the thermostat does.

    You need more information.
     
  13. unkledaddy
    Joined: Jul 21, 2006
    Posts: 2,864

    unkledaddy
    Member

    I would try a new (not rebuilt) OEM water pump first, for cheap. If the rest of your cooling system is up to snuff I'll bet it's all you'll need.
     

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