HEATED 4 BBL INTAKE

Discussion in 'Slant 6 Engines' started by A/MP, Jul 13, 2018 at 9:04 PM.

  1. A/MP

    A/MP Well-Known Member

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    Clifford or Offy had an intake that was preheated by water from the radiator. Did it make any difference?
     
  2. pishta

    pishta I know I'm right....

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    it should in cold weather. 60-70 high humidity can ice a carb too. probably not a factor in Florida....
     
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    • Johnny Dart

      Johnny Dart Well-Known Member

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      Clifford has a built in plenum, and absolutely it works.
      It actually works in 2 ways. It heats the carb to operating temp, and also keeps it from getting to hot. It will keep the carb and intake right around the temperature of the coolant.
      Works well.
       
    • A/MP

      A/MP Well-Known Member

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      I looked at the Clifford site and it only shows a 2bbl intake. There pic does show anything about a water hook up.
       
    • Tooljunkie

      Tooljunkie King of cobble/master of the broken bolt FABO Gold Member

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      I recall a plate between carb and manifold that fords used many moons ago.had heater hoses connected to it. Wonder if an enterprising individual could flange something up??
       
    • Tooljunkie

      Tooljunkie King of cobble/master of the broken bolt FABO Gold Member

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      This... FB89BFE1-F45F-4414-9B44-EB83FF2F9BEB.png
       
    • Johnny Dart

      Johnny Dart Well-Known Member

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      I guess I just make this stuff up ?
       
      Last edited: Jul 15, 2018 at 10:42 AM
    • 67Dart273

      67Dart273 Well-Known Member

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      ^^Ford 4 bl heated spacer. You might find them on Egag etc
       
    • fjr

      fjr Well-Known Member

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      Don't use a heated spacer. You want the intake manifold to have a hot spot on the floor of the intake manifold and the carburetor to be as cool as possible. Heating the carburetor leads to percolation. See Intake Manifold Heat and Vapor Lock.
       
    • pishta

      pishta I know I'm right....

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      I dont think the coolant would bring the carb up to percolation temperatures as the carb is somewhat self cooling when running. oyu want to add heat when running, exhaust is the fastest heat you can get short of an electric carb heater.
       
    • 67Dart273

      67Dart273 Well-Known Member

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      .....
       
    • fjr

      fjr Well-Known Member

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      It's better to insulate the carburetor from the intake manifold than to heat it.
       
    • Tooljunkie

      Tooljunkie King of cobble/master of the broken bolt FABO Gold Member

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      I somewhat agree. But up here, when temps are in the low 60’s and humidity is high frost will form in the carb. I have seen it.
      But the solution is the warm air intake built into the air cleaner.
      The time it takes to warm the coolant from cold start will still allow the frost to form.
      Seems 4bbl carbs are less succeptible to this.once engine is at operating temp,the frost is rarely an issue