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Downdraft Tube--

Discussion in 'The Hokey Ass Message Board' started by Sooowee, Apr 5, 2006.

  1. Sooowee
    Joined: Mar 22, 2006
    Posts: 86

    Sooowee
    Member
    from Auburn, CA

    What is it for?

    Sorry for the newbie question, but I can't seem to find anything about its function in any of the service manuals that I have for my car. I have a 1954 Ford Customline with the 223 I-6. It seems like all this tube does is create a smoke screen whenever I'm accelerating...:p Is this a bad sign? It doesn't put out as much smoke when at idle, or when cruising along. Thanks for all your insight!

    Fred
     
  2. From what I've heard, it is a crank case ventilation. My 55 265 had a road draft tube.

    James
     
  3. jaybee
    Joined: Mar 3, 2001
    Posts: 268

    jaybee
    Member

    It's what was used to ventilate the crank case before PCV came along.
     
  4. Dirty Dug
    Joined: Jan 11, 2003
    Posts: 3,722

    Dirty Dug
    Member

    sounds like you need new rings to me...
     
  5. Sooowee
    Joined: Mar 22, 2006
    Posts: 86

    Sooowee
    Member
    from Auburn, CA

    Cool. Thanks guys! Now, is it normal for smoke to come out of this tube? It's not a lot, except for when I accelerate. I saw a filter kit somewhere--could the smoke be from oil ac***ulation in the filter or tube? Should I worry, or is this a normal thing for these older cars?

    Fred
     
  6. i don't know if you can call it "normal"...but if the engine is a lttle tired ,,,yes , it will smoke out of it

    is the motor hard on oil? how many miles on a quart? could you do a compression check ?

    i'd say if you can get 500--1000 mles to a quart , it runs good , doesn't make any strange sounds...it's ok and just run it
     
  7. Hellfish
    Joined: Jun 19, 2002
    Posts: 6,802

    Hellfish
    Member

    a little smoke is normal. a little. a smoke screen sounds like a problem.
     
  8. Terry O
    Joined: Oct 12, 2004
    Posts: 1,060

    Terry O
    Member

    You can plug the tube, tap a fitting into the top piece of the tube and connect a hose. Connect this hose to a PCV valve then another piece of hose to your motors intake manifold. This will get rid of a lot of fumes and oil drippin' on the driveway. If your rings are bad this ain't gonna fix it...PCV valves have different ratings so if your running a dizzy with vacuum advance you might have to play around till the advance lines up with original specs. Start with a PCV valve from a modern engine with close to the same displacement.To really do it right, run a non vented oil cap and run a hose from the valve cover to the underside of the air cleaner. This is a closed breathing system. Clutters up but keeps the engine space a whole lot cleaner.
     

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