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how much of a difference does a hood make with overheating

Discussion in 'The Hokey Ass Message Board' started by LEFTY_, May 7, 2012.

  1. LEFTY_
    Joined: Mar 15, 2012
    Posts: 66

    LEFTY_
    Member
    from The 702

    My question is this have any of you guys built a rod and ran it with and without a hood and noticed a difference in engine temps Being in las vegas i need all the help i can get

    thanks in advance
    -lefty
     
  2. temper_mental
    Joined: Oct 22, 2006
    Posts: 2,718

    temper_mental
    Member
    from Texas

    If the hood makes a difference in cooling you have other problems.
     
  3. LEFTY_
    Joined: Mar 15, 2012
    Posts: 66

    LEFTY_
    Member
    from The 702

    i realize that i was just wondering if it is a misconception that no hood makes a difference. kind of like H.A.M.B. mythbusters i guess
     
  4. garcoal
    Joined: Nov 15, 2006
    Posts: 277

    garcoal
    Member

    buy a new radiator, you can jack around till the cows come home. till the radiator is up to snuff you are just kidding yourself
     

  5. remember most v-8's are WATER cooled while air passing through the radiator fins dose the cooling having it pass over the engine itself is just a marginal factor

    check your cooling system

    if its good buy some water wetter or purple ice or simular to aid in cooling also propper antifreeze /water mix helps alot
     
  6. LEFTY_
    Joined: Mar 15, 2012
    Posts: 66

    LEFTY_
    Member
    from The 702

    nevermind i gues i will have to conduct my own experiment
     
  7. 6-71
    Joined: Sep 15, 2005
    Posts: 542

    6-71
    Member

    I have run my 39 chevy(6-71 blown 350) with a stock hood,then with a full hood with the side louvers filled,and recently with no hood. I have seen no difference in operating temperature with any of these configurations.
     
  8. LEFTY_
    Joined: Mar 15, 2012
    Posts: 66

    LEFTY_
    Member
    from The 702

    thank you sir
     
  9. Deuce Roadster
    Joined: Sep 8, 2002
    Posts: 9,519

    Deuce Roadster
    Member Emeritus

    This was a test but may not help.

    On my 32 Fords ... I have run a 20 vent and then a 25 vent hood and the under hood temperature were 20 to 30 degress warmer with the 20 vent hood. This had no effect on the water temperature of the engine ( 180 ) ...but if it was running warmer, I would guess that the 25 vent hood would be a benefit. Henry Ford came out with the 25 vent hood late in the 1932 Ford production run to help cure the flathead overheating issues. :D

    [​IMG]
     
  10. mr.32
    Joined: Mar 11, 2010
    Posts: 77

    mr.32
    Member

    I've run flatheads without hood / hood sides and ran about 10 degrees cooler. 25 hood sides came out late on 32 trucks only.
     
  11. gas pumper
    Joined: Aug 13, 2007
    Posts: 2,955

    gas pumper
    Member

    When it gets over 85* here, I take the hood sides off on my T. It helps. 15" 6 blade Mechanical fan and shroud. Small radiator, 17 1/4 wide and 15 tall.

    The theory is, a good system will run at ambiant air temp plus 100*
     
  12. primed34
    Joined: Feb 3, 2007
    Posts: 1,154

    primed34
    Member

    Run my '34 without a hood and with the hood but no sides. I couldn't tell that much difference in running temperatures.
     
  13. BuiltFerComfort
    Joined: Jan 24, 2007
    Posts: 1,620

    BuiltFerComfort
    Member

    Also, check for air paths both in and out of the engine bay. Old cars had more room at the bottom of the motor and let more air out that way. A friend told me about a 38 Plymouth that would not cool properly until the hood was louvered; until then it trapped the hot air inside the engine compartment.
     
  14. Blown Monte
    Joined: Dec 23, 2007
    Posts: 49

    Blown Monte
    Member
    from Delaware

    Just put my 406 s/b with a 671 on it in my o/t 32 with no hood, from a o/t 70 Monte, there was a 15+ degree drop in water temp.YES is the answer.
     

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  15. GassersGarage
    Joined: Jul 1, 2007
    Posts: 4,728

    GassersGarage
    Member

    My buddy's '49 Merc had a 350/350 combo with a/c. The Merc ran hot until he louvered the hood.
     
  16. Deuce Roadster
    Joined: Sep 8, 2002
    Posts: 9,519

    Deuce Roadster
    Member Emeritus

    Actually, they also came on passenger cars with V8 engines headed for warmer climates.
    They did come out later in the year.
    I have read that it was the end of August 1932.
     
  17. Giovanni
    Joined: Jan 21, 2010
    Posts: 173

    Giovanni
    Member

    It should help. The more air flowing over the radiator, the more heat it can transfer from the coolant to the air. If you have an adequate radiator, you shouldn't need to, but if your radiator is close to stock, the added air flow will help. Building a fan shroud will make a difference too. Good luck!
     

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