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Technical Anyone in know if a 1933 Chrysler had a pressurized radiator?

Discussion in 'The Hokey Ass Message Board' started by gimpyshotrods, Oct 2, 2021.

  1. gimpyshotrods
    Joined: May 20, 2009
    Posts: 18,692

    gimpyshotrods
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    I am working on a historic hot rod powered by a 1933 Chrysler CT straight-8.

    It has a semi-modern radiator with a 13psi cap.

    I am not sure that this should be a thing, or at least not that pressure.

    I just rebuilt the water pump, because it was pushing water past my the packing. Before I put it back together, I want to make sure I am not repeating an error.

    No cap that I have seen for cars with this engine appear to be pressure caps
     
  2. The open type (non-pressurised) radiators had the over flow below the level of the cap seal (Straight atmospheric vent). It may have a 13 PSI cap, but if the vent is below the seal, the rating means nothing,
     
    rusty valley likes this.
  3. gimpyshotrods
    Joined: May 20, 2009
    Posts: 18,692

    gimpyshotrods
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    I am aware. I am trying to figure out if this engine, and more specifically this water pump, is supposed to be paired with an unpressurized radiator.
     
  4. razoo lew
    Joined: Apr 11, 2017
    Posts: 470

    razoo lew
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    from Calgary

    @Rusty O'Toole you seem to know a lot of things old Mopar - can you help
     

  5. Mr48chev
    Joined: Dec 28, 2007
    Posts: 30,041

    Mr48chev
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  6. gimpyshotrods
    Joined: May 20, 2009
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    gimpyshotrods
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    That is what I assume. I am not convinced that a water pump of this ancient design is going to be all that happy with that 13psi cap.
    PXL_20211002_200936492.jpg
    I had to rework the whole inside. The packing tube, which is a separate steel piece, fell out during cleaning. I bonded it back in with Loctite 660.

    I have no idea what was supposed to be in there, but there was nothing for the packing to be snugged-up against. It could not seal. I suspect some stuff was left on the bench. It was fitted with shielded (not sealed) bearings that I identified to be from the 1980's. It already had a stainless steel impeller. I cannot imagine that it was stock.

    I loaded it up with sealed bearings, and high-tech carbon graphite packing. I left the packing nut a little loose. I will sneak up on it until the drip stops, if it drips.

    Fingers crossed. These are pretty rare.
     
  7. BJR
    Joined: Mar 11, 2005
    Posts: 7,149

    BJR
    Member

    The first pressurized caps that I have ever seen were 7 LBS. And that was in the 40's. Nothing in the 30's had a 13 LB cap.
     
  8. Remember, all cars can run fine with a no pressure cap. All pressurizing does is raise the boiling point of the coolant.
    If the coolant temp never exceeds 212 degrees, everything is fine without pressure.
    I'd run a no pressure cap and watch the temp gauge. If you use a thermostat, use a 160. Probably be ok with no stat, as long as you don't need a heater.
    Hope this helps.
     
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  9. TrailerTrashToo
    Joined: Jun 20, 2018
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    Hnstray and Blues4U like this.
  10. goldmountain
    Joined: Jun 12, 2016
    Posts: 3,102

    goldmountain

    The original rad on my '47 Plymouth was vented so I would imagine that a Chrysler much older would be also.
     
  11. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,608

    Rusty O'Toole
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    First Chrysler products with pressure cap was 1951 and it was 4 pounds. 1933 was not pressurized. Not to say you couldn't use a pressure cap on one if the water pump had the right seal, and the radiator and heater were rated to stand the pressure.
    I have used a 4 pound cap on cars that were not pressurized but wouldn't go higher than that.
     
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  12. jimmy six
    Joined: Mar 21, 2006
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    Our 56 had a 7 psi cap, no recovery, and you keep the coolant 1” low in the upper tank for expansion. The chart shows a lot of boil over protection. If you have a heater; the core might be a weak point.
    Since it’s not sealed contamination does occur. I change the 50-50 mix every 4 years.
     
  13. Budget36
    Joined: Nov 29, 2014
    Posts: 7,246

    Budget36
    Member

    Just curious, does that Chrysler have a 3 slot/tang radiator for the cap?
    I’d like to run the Honey Comb radiator I have, but has a radiator fill for a 3 tang cap, and haven’t been able to find one. Hate to try and have someone put something “modern” on it.
    Any chance you can post a pic of the cap if it has 3 tangs?
     
    Stogy likes this.
  14. Truckedup
    Joined: Jul 25, 2006
    Posts: 4,209

    Truckedup
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    Pressurization also helps to eliminate steam pockets...Many opinions on engine operating temeratures
     
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  15. Ebbsspeed
    Joined: Nov 11, 2005
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    Ebbsspeed
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    Straying a bit from the post, I always run a coolant recovery tank on the non-pressure systems. Just run a hose from the overflow tube to the bottom of the tank, fill the radiator completely and add half a pint to the recovery tank. It keeps the radiator completely full of coolant, and the expanded hot coolant flows out the tube to the tank. The radiator cap isn't a pressure cap, but does seal against the radiator filler tube so as the system cools off it draws coolant from the tank back into the radiator.
     
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  16. gimpyshotrods
    Joined: May 20, 2009
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    It has a modern radiator. I am sourcing a cap that fits, but does not hold pressure. The owner is sourcing a period-appropriate vessel for overflow.
    It is a hot rod. It does not have the Chrysler radiator.
    118156475_3167151863321628_5999330485081051276_n.jpg
     
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  17. gimpyshotrods
    Joined: May 20, 2009
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    gimpyshotrods
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    And yeah, I know, the barrel on the machine gun is on upside-down. We'll fix that later.
     
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  18. Stogy
    Joined: Feb 10, 2007
    Posts: 21,187

    Stogy
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    Wow is that way out there...it looks to possibly predate the bloody red Baron...is it a new build or survivor...sorry Stogys Nosy...:)
     
  19. gimpyshotrods
    Joined: May 20, 2009
    Posts: 18,692

    gimpyshotrods
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    It is the Von Zipper. It is a tribute. It was built after. The oldest parts are from 1919.

    It has been in a whole mess of photo shoots, to a zillion shows, and has appeared on numerous album covers.
    [​IMG]
    [​IMG]
     
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  20. Stogy
    Joined: Feb 10, 2007
    Posts: 21,187

    Stogy
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    Thanks for Sharing that Gimpy...truly a tribute in Showrod/Hotrod and all in between...love those exotic engines of the Yesteryear just seeing all the linkage working those carbs and the sound... probably like an old airplane...
     
  21. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 5,605

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    It appears to be a late 30's GM radiator. The top with the angled filler tube and center outlet looks like 37/38 Chevy or Buick.
     
  22. noboD
    Joined: Jan 29, 2004
    Posts: 7,774

    noboD
    Member

    That cowl sure looks like it's an F'n Dodge.
     

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