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Technical Radiator overflow tank

Discussion in 'Traditional Hot Rods' started by spillaneswillys, Aug 29, 2017.

  1. I need to put an overflow tank on my 34 Dodge and I have read some of the posts here and can't quite figure out what is correct. Most of the tanks I see for sale have two tubes, the guy from Speedway told me one is for overflow. It looks like they feed from the bottom with a cap on top. Just looking for some input on what works best.
    thanks, Carpenter Joe
     
  2. Never2old
    Joined: Oct 14, 2010
    Posts: 648

    Never2old
    Member
    from so cal

    The one that ends close to the cap is for venting if the overflow tank gets over full.
     
    loudbang likes this.
  3. Work In Progress likes this.
  4. Looks like this on the inside...

    91102215_L_b99b763d-a46e-4c94-b7f7-25ff28584001.jpg
     
    loudbang and David Gersic like this.

  5. Now I understand thanks Moose!
     
    loudbang likes this.
  6. tfeverfred
    Joined: Nov 11, 2006
    Posts: 15,793

    tfeverfred
    Member

    One line is for inlet, the other is to expel over-flow. If you looked inside, you'd see how it works. It's actually a fairly simple process. Fluid enters the inlet tube (which goes near the top) and rises accordingly. When the tank is full, the over flow expels from the other tube, which also goes near the top.
     
  7. Jalopy Joker
    Joined: Sep 3, 2006
    Posts: 25,273

    Jalopy Joker
    Member

    that style tank is properly used as a recovery tank - when running proper radiator and cap the fluid will expand out to the tank and when system cools fluid will be drawn back into radiator. some just have a tank/can/bottle, etc to catch fluid that is pushed out to hopefully prevent it from just going onto the surface below.
     
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  8. squirrel
    Joined: Sep 23, 2004
    Posts: 46,891

    squirrel
    Member

    the short tube on that one goes to the radiator, the long tube drains (to the ground) when it gets too full.

    Do you really need one? an alternative is to not fill the radiator completely full, leave an inch or two of air in the top radiator tank, and don't worry about it.
     
    Allmotor, Fordor Ron, Poh and 2 others like this.
  9. I use a $10 Dorman tank, 1 hose from the radiator, and it works well.
     
  10. Fat47
    Joined: Nov 10, 2007
    Posts: 1,241

    Fat47
    ALLIANCE MEMBER

    I use a 16 oz. Pabst Blue Ribbon can on my built 318 in my 33 Dodge coupe and have never had a problem. And I had the benefit of being able to drink the original contents.
     
    loudbang likes this.
  11. squirrel
    Joined: Sep 23, 2004
    Posts: 46,891

    squirrel
    Member

    Everyone knows Schlitz is where it's at

    [​IMG]
     
  12. I still use an old gas can or reasonable collecting device and a dip tube, IE let my hose lay in the bottom of the receptacle. A catch can is just not that technical.
     
  13. when someone said something about the PBR can I just knew Squirrel would chime in!
     
  14. My preferred overflow bottle is a GM Optikleen bottle and mount. Mount it on the inner fender or core support, put a little antifreeze in the bottom and plug a hose into it. Works great. and you can take the bottle out and clean it if it get nasty real easy. I have found several over the years in junk yards .

    BOTTEL.jpg
     
    Donuts & Peelouts likes this.
  15. cshades
    Joined: Sep 2, 2011
    Posts: 488

    cshades
    Member
    from wi

    I made my own out of exhaust tube(body) and brake line(tubes) and powder coated it when I was done. I have the inlet tube coming out of the top, over flow out of the side at the top and a drain petcock on the bottom.
     
  16. Blue Moon Garage
    Joined: Mar 1, 2009
    Posts: 282

    Blue Moon Garage
    Member

    Do you really need one? an alternative is to not fill the radiator completely full, leave an inch or two of air in the top radiator tank, and don't worry about it.

    Absolutely correcto mongo!
     
  17. sloppy jalopies
    Joined: Jun 29, 2015
    Posts: 4,189

    sloppy jalopies
    ALLIANCE MEMBER

    made one from pvc tube with 2 end caps...
    should have gone through the bottom as the heat beat the daylights out of the threaded holes on top...
     
  18. cshades
    Joined: Sep 2, 2011
    Posts: 488

    cshades
    Member
    from wi

    I put one on because it seemed like any time I parked in some bodies nice driveway it would decide it was going to puke a bit. With the tank installed I only have to worry about the oil spots I am leaving. :)
     
  19. Blues4U
    Joined: Oct 1, 2015
    Posts: 4,881

    Blues4U
    Member
    from So Cal

    An aluminum water bottle works for me.

    IMG_7053b.JPG
     
  20. Mr48chev
    Joined: Dec 28, 2007
    Posts: 27,544

    Mr48chev
    ALLIANCE MEMBER

    Best reason outside of needing one to run at the drags I can think of. That and if it leaves a puddle with antifreeze in it some animal may decide to drink it.
     
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  21. squirrel
    Joined: Sep 23, 2004
    Posts: 46,891

    squirrel
    Member

    Generally they won't leave a puddle after they find their level. But if it keeps puking, after it's down enough to allow for expansion...well, I guess you need one. Or fix the problem that's causing it to puke :)
     
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  22. Donuts & Peelouts
    Joined: Dec 12, 2016
    Posts: 1,191

    Donuts & Peelouts
    Member
    from , CA

    Anyone had any bad luck running a glass bottle/Can and having it crack and break on them?

    Sent from my SM-J727T1 using The H.A.M.B. mobile app
     
  23. Depends on where you race I suppose. ;)
     
  24. squirrel
    Joined: Sep 23, 2004
    Posts: 46,891

    squirrel
    Member

    Most folks don't race, I was talking to them.
     
  25. I was just answering blue moon's question. ;)

    I am trying to remember the first car I owned with an overflow, I am guessing that it was a '70s Olds. I think the first late model car I owned was a '68 Mustang and I don't think it had an overflow as I recall. Most of the old hoopties that Jim and me started out with didn't have them, they are more of a modern deal, I don't recall any of my old cars puking unless they were overheated and those were usually hot enough to up puke past the radiator cap. A good stiff cap keeps a lot of that overflow tube stuff in the radiator. Also raises your boiling point.
     
  26. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 6,884

    Bandit Billy
    ALLIANCE MEMBER

    Just a thought here, if you fill the radiator with oil and grease remover it would self clean the oil spots in the driveway. :cool:
     
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  27. blazedogs
    Joined: Sep 22, 2014
    Posts: 457

    blazedogs
    Member

    Question on the overflow tube

    Is there a recommended heighth to mount the tank in relation to the radiator ?
     
  28. squirrel
    Joined: Sep 23, 2004
    Posts: 46,891

    squirrel
    Member

    It doesn't really matter.
     
    porknbeaner likes this.
  29. boo
    Joined: Jul 6, 2005
    Posts: 549

    boo
    Member
    from stuart,fl.

    i use a WWII ALUM CANTEEN
     
  30. rickl
    Joined: Aug 3, 2012
    Posts: 102

    rickl
    Member

    I use a spun aluminum bottle I found in the lab garbage. it still has the sds stickers on it.
     

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