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Technical Firewall For A 31 Coupe

Discussion in 'Traditional Hot Rods' started by Mark Jenny, Jan 23, 2015.

  1. Mark Jenny
    Joined: Oct 23, 2014
    Posts: 821

    Mark Jenny
    Member

    Is the shape/arch at the top and sides the same in a 31 and 32?
     
  2. Mark Jenny
    Joined: Oct 23, 2014
    Posts: 821

    Mark Jenny
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    Is that a ford motor in that truck?
     
  3. Mark Jenny
    Joined: Oct 23, 2014
    Posts: 821

    Mark Jenny
    Member

    oh yea..I didnt see those supports to the radiator missing
     
  4. Mo rust
    Joined: Mar 11, 2012
    Posts: 534

    Mo rust
    Member

    The shape is the same other than the fact that the 32 firewall is taller. The ears are usually ruined on the old feet anyway so I cut the bottoms off at the right height and weld on a flat strip on the bottom. This also supports the front of the cowl.

    This topic is proof of my saying that you can't wait until you need parts to collect them. If you wait to look for parts until you need them, you'll never find them or they are overpriced.
     
  5. Mark Jenny
    Joined: Oct 23, 2014
    Posts: 821

    Mark Jenny
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    ok...I'll get to searching for a 32..but if I cant find one,they make after market ones...they are more expensive than a 30/31, but I think the modifying is less which saves labor
     
  6. Mark Jenny
    Joined: Oct 23, 2014
    Posts: 821

    Mark Jenny
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    so if I dont need the feet on a 32 firewall will this work?...then I just fabricate some feet/mounts 32 firewall.JPG
     
  7. nickk
    Joined: Feb 2, 2011
    Posts: 749

    nickk
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    yes the top is soooo close, and that is a ford motor in the truck and yeah that firewall would be a good way to go if you plan on cutting on it
     
  8. Mark Jenny
    Joined: Oct 23, 2014
    Posts: 821

    Mark Jenny
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    Am I wrong, or does that motor in the truck have a rear distributor?
     
  9. Mark Jenny
    Joined: Oct 23, 2014
    Posts: 821

    Mark Jenny
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    I think the firewall in MO Rust roadster looks more like this one? $_57.JPG
     
  10. Mark Jenny
    Joined: Oct 23, 2014
    Posts: 821

    Mark Jenny
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    its not flat, but has a break in it
     
  11. Speed~On
    Joined: Apr 28, 2011
    Posts: 1,315

    Speed~On
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    The distributor on that mint green truck is in the rear of the engine. It's kinda hiding under the air cleaner against the firewall.
     
  12. nickk
    Joined: Feb 2, 2011
    Posts: 749

    nickk
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    ford y blocks had the dizzy in the back, that's how ford did on their first ohv engine
     
  13. Mark Jenny
    Joined: Oct 23, 2014
    Posts: 821

    Mark Jenny
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    did Ford make a motor with a rear distributor?
     
  14. Mark Jenny
    Joined: Oct 23, 2014
    Posts: 821

    Mark Jenny
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    ok..theres the answer..thanks...I didnt know that...of course theres a ton I dont know about this stuff:rolleyes:
     
  15. Mo rust
    Joined: Mar 11, 2012
    Posts: 534

    Mo rust
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    My roadster and my sedan have both been modified the same by shortening the feet and placing a flat panel on the lower center with the edges bent out. Here's a better look at the one in my 30/31 sedan.
     

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  16. Mo rust
    Joined: Mar 11, 2012
    Posts: 534

    Mo rust
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    One of these 32 style flat firewalls would probably work pretty well as long as you support the front cowl corners inside it.
     
  17. nickk
    Joined: Feb 2, 2011
    Posts: 749

    nickk
    Member

    Mo rust! you wouldn't happen to have the rest or any pieces of the bottom of that firewall laying around would you? I know your roadster has been done a long time ago but I'm trying to fix my firewall back.
     
  18. skreemin
    Joined: Feb 24, 2006
    Posts: 146

    skreemin
    Member
    from Salem Or

    I flipped my stock firewall around cut the indentation out and welded it back in facing in stock direction so the distributor would fit. Welded it from the inside so it's hard to see how its attached.
     
  19. Mark Jenny
    Joined: Oct 23, 2014
    Posts: 821

    Mark Jenny
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    I've heard this is "old school" method, and works very well.....do u happen to have a pic or two of that?
     
  20. Mark Jenny
    Joined: Oct 23, 2014
    Posts: 821

    Mark Jenny
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    Thanks for the link..I'll use it...yes I agree the 32 does thin down the cowl, and I like the bulb-es shape of the 31, but it my fit my situation better to go flatter...I dunno yet..sooo many decisions:eek:
     
  21. skreemin
    Joined: Feb 24, 2006
    Posts: 146

    skreemin
    Member
    from Salem Or

    I will say measure, slow down, think and plan before you mark and cut! I took the firewall out, cut the distributor "pocket" out flipped the firewall, lined all the edges up then started tacking the firewall back in. No problem! Then I stepped back and realized the distributor pocket isn't centered or symmetrical! Not a big deal just extra work to make it right.
     

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  22. skreemin
    Joined: Feb 24, 2006
    Posts: 146

    skreemin
    Member
    from Salem Or

    Do not use a wheel barrow! Id heard of this trick. Thought id try it. It looks like what it is...a wheel barrow shoved in to a firewall!
     

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  23. When I get around to my coupe I will either flip it or do like Mo Rust did here.
     
  24. Mark Jenny
    Joined: Oct 23, 2014
    Posts: 821

    Mark Jenny
    Member

    flipping makes sense if you have a firewall already useable in the car..but I dont..so the 32 seems like an easier route...they both lose the bulbis look of the 31, so the path of least resistance makes sense
     
  25. Mark Jenny
    Joined: Oct 23, 2014
    Posts: 821

    Mark Jenny
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    BTW Skreemin...you coupe looks bitchen!!:)
     
  26. Elpolacka here on the HAMB makes a stamped firewall panel that may be a good start to what you want to accomplish as an alternative to buying and modifying a repop '32 firewall.
     
  27. Mark Jenny
    Joined: Oct 23, 2014
    Posts: 821

    Mark Jenny
    Member

    THANKS..I'll check that out
     
  28. skreemin
    Joined: Feb 24, 2006
    Posts: 146

    skreemin
    Member
    from Salem Or

    Thank you! Those pics are a couple years old. It's currently torn down so i can paint it...2 summers ago! Haha!
     
  29. U-235
    Joined: Dec 18, 2010
    Posts: 452

    U-235
    Member

    31 Model A channeled 4-1/2" with early Olds and T-85 w/od and stock wheel base. I knew I would have to cut the firewall or install a recessed flat firewall. I was talking to my co-worker of my dilemma, when he volunteered "I'll give you a flat firewall". I went over to his place around 7:30 and had it installed in my Model A by 10:30. He was building an early hybred. He had a 36 Mercedes phaeton powered by a 300 cu in Ford 6 with 3 Webers that he built. Evidently the body was junk (I never saw it) and he replaced it with a 34 Ford body for the winter months and a 34 Ford Phaeton body for the summer. He kept the fenders and grille, but made his own hood. This guy was weird to say the least, but a good craftsman.....he even had a torque arm attached to the frame to read out on the dash. The car turned out really nice, but now he is putting in a straight 8 Buick w/supercharger........Anyway, I took his firewall home and just trimmed the edges 1-1/2 inches and made brackets to attach it and put it in.
    The top curve fits the inside of the Model A like it was made for it, and it even has radiator support rod bosses. The bottom was trimmed to fit the contour of the olds bellhousing. Sooo...keep your eye open at you Pull-A-Part.
     

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