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Hot Rods Thermostat and thermal switch

Discussion in 'The Hokey Ass Message Board' started by Departed, Jan 26, 2021.

  1. Departed
    Joined: Dec 20, 2010
    Posts: 174

    Departed
    Member
    from Canada

    Hi gang,
    Running a flathead in my 40 Ford and I'm going with an electric fan. Wondering what thermal switch to use and where to install it. (Radiator lower/top hose, head..etc) also I'm running 180° thermostats on the engine. So what temp switch should I use?
    Thanks.


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  2. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 8,183

    Bandit Billy
    ALLIANCE MEMBER

  3. Departed
    Joined: Dec 20, 2010
    Posts: 174

    Departed
    Member
    from Canada

  4. temp.jpg I have used a 12volt electronic heater controller, and soldered a small tube to the header tank to fit the sensor into, with heat transfer paste. A bypass switch or similar is also handy in case the controller dies.
    View attachment 4955297
     

  5. Departed
    Joined: Dec 20, 2010
    Posts: 174

    Departed
    Member
    from Canada

    What's the pros and cons of using the radiator over the engine for the thermal switch ?


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  6. As long as you are sensing the return coolant temperature, it doesn't really matter. I checked the temps with a infra-red thermometer, and there was not much difference between the thermostat housing surface and the radiator tank surface. One less wire going to the engine.
     
    Departed likes this.
  7. Departed
    Joined: Dec 20, 2010
    Posts: 174

    Departed
    Member
    from Canada

  8. BJR
    Joined: Mar 11, 2005
    Posts: 7,252

    BJR
    Member

    Why not use an engine driven fan, they have worked for almost 90 years on flatheads.
     
  9. Budget36
    Joined: Nov 29, 2014
    Posts: 7,573

    Budget36
    Member

    Space, parts availability, time, etc. I put a different style in my ‘42 PU , the 221 I used had a fan on a hub that was too high and would not have a chance of clearing the radiator hoses. I guess I could have done the search, buy, wait thing. But stuck a electric fan on it because I had one, and truck was drivable in a day.
    Kinda like using a modern rear under your car instead of looking for what was available 40 years ago
     
  10. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 8,183

    Bandit Billy
    ALLIANCE MEMBER

    That's funny!
     
    firstinsteele likes this.
  11. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 8,183

    Bandit Billy
    ALLIANCE MEMBER

    Oh, and I have a 180 thermo switch on my electric fan in my flathead powered roadster. I installed it in the bottom of the radiator and have driven it for a couple of years and never once overheated.
     

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