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Hot Rods Why does my SB overheat/ run hot?

Discussion in 'The Hokey Ass Message Board' started by BaBa, Jul 9, 2021.

  1. Rramjet1
    Joined: Mar 13, 2018
    Posts: 147

    Rramjet1

    Since you’re in AZ you could get away with running straight distilled water most of the year. Coolant doesn’t offer as much heat dispassion as straight water.
     
  2. Budget36
    Joined: Nov 29, 2014
    Posts: 6,984

    Budget36
    Member

    But then there’s no corrosion resistance
     

  3. AD trucks have a huge air space above the engine that collects hot air that doesn't get expelled. I've thought about louvering my hood to help get the hot air out.
     
    John Lee Williamson likes this.
  4. sdluck
    Joined: Sep 19, 2006
    Posts: 2,782

    sdluck
    Member

    He moved the vacuum hose from ported to manifold vacuum and said it fixed the problem.I doubt we will here from him again.
     
  5. squirrel
    Joined: Sep 23, 2004
    Posts: 49,536

    squirrel
    Member

    I run water and a corrosion inhibitor in my Chevy II, and I keep it inside it won't freeze in winter. Yes, it can get cold here.
     
    Lil32 likes this.
  6. gimpyshotrods
    Joined: May 20, 2009
    Posts: 18,490

    gimpyshotrods
    ALLIANCE MEMBER

    There is a reason why we use Spal fans at GM for performance and prototyping.
     
    olscrounger likes this.
  7. Never saw any pics of the front of the radiator. Proper shrouding includes both sides of the radiator.
     
  8. sdluck
    Joined: Sep 19, 2006
    Posts: 2,782

    sdluck
    Member

    He never answered our question.
     
  9. jimmy six
    Joined: Mar 21, 2006
    Posts: 9,718

    jimmy six
    ALLIANCE MEMBER

    He is gone… This is over….:)
     
    Tman likes this.
  10. norms30a
    Joined: Jul 17, 2008
    Posts: 574

    norms30a
    Member

    too bad he's gone, this is interesting.
     
  11. Rramjet1
    Joined: Mar 13, 2018
    Posts: 147

    Rramjet1

    They have additives.
     
  12. Budget36
    Joined: Nov 29, 2014
    Posts: 6,984

    Budget36
    Member

    But you didn’t mention that. Hence my reply.
     
    gimpyshotrods likes this.
  13. David Gersic
    Joined: Feb 15, 2015
    Posts: 2,416

    David Gersic
    Member
    from DeKalb, IL

    The “Corvette” pump is “short” and moves the heater hose to the side, 9 o’clock position, vs. the straight up exit on the passenger car short pump. I’m guessing that the lower hood height on the Corvette forced this change in hose routing, but not being a Corvette expert, that’s just a guess.

    On the 68-70 pump, the shaft diameter is 3/4”. 71 and up, the shaft is 5/8” diameter, and 3/16” longer.
     
  14. Also check the hood where it surounds the radiator, if the shroud is not there the fan will pull the hot air back in the front of the radiator. Check rear portion of the engine compartment, the air has to get out at the rear so if there are components blocking the rear air exits the hot air won't get out. There's always, leave the hood at home, louvers or raising the rear of the hood to let more air out. JW
     
  15. stubbsrodandcustom
    Joined: Dec 28, 2010
    Posts: 1,427

    stubbsrodandcustom
    ALLIANCE MEMBER
    from Spring tx

    I see your running a Flex a lite fan.. Get rid of it... Yeah they claim big numbers but those are numbers free flow not on a radiator. Spal and Derale are the two companies who actually test theirs that way.. Those 2 companies are the best electric fans on the market...

    Ditch the flex a lite no matter what and things will improve I think no mater what...
     
  16. joeyesmen
    Joined: Dec 24, 2010
    Posts: 494

    joeyesmen
    Member

    Punch some louvers in the hood - let that heat escape.

    Screen Shot 2021-07-17 at 10.48.42 AM.png
     
  17. A really good cooling system T/S includes measuring air flow across the core. The Semi dealers use the Blowby air flow meter and then can compare to oem requirements and power. The electric fan pictured, leaves a lot of core unshrouded. This would reduce radiator efficiency as well.
     
    jimmy six likes this.

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