Register now to get rid of these ads!

Adapting the 39 Ford Backing Plates

Discussion in 'The Hokey Ass Message Board' started by Scotch Buzzard King, Apr 24, 2008.

  1. I have the plates and gennie 32 Ford spindles. I know that Speedway offers a kit to adapt the two, but I do not like the adapter ring that goes between the spindle and plate because it does not look like it is made of steel. I want it made of steel so I can weld it to the plate and not have to think about it afterwards. Does anyone within the reading confines of this message make or know someone who makes this in steel, or will I be left with the mystery material?
     
  2. lowsquire
    Joined: Feb 21, 2002
    Posts: 2,567

    lowsquire
    Member
    from Austin, TX

    someone on here modified the early spindles by welding the holes shut, then running a length of square stock around the edge, weld and heat/bend in short sections,so as to make the outside diameter bigger, then redrilleing to suit bigger bolt pattern. done carefully and welded proerly, this method has merit. sorry if my description is hazy, cant think of an easier way to explain it..
     
  3. weemark
    Joined: Sep 1, 2002
    Posts: 830

    weemark
    Member
    from scotland

    the rings from speedway are steel - theyre actually pistons rings from something which happen to fit. i kind of came up agains this problem earlier in the week and I thought about filling the hole in the backplate completely and getting a new hold machines into them.... but I decided to go with later spindles - its easier than all the fab work which needs done to get late backplates to fit early spindles.

    when i looked at the bolt pattern on my backplates and spindles I would have had to cut slots on the backplates - i would not have got away with filling the holwa then drilling near the edge of the backplate as the bolts still would not have went through the backplates/spindles.

    here is a very good illustration as to how to do it

    http://www.jalopyjournal.com/forum/showthread.php?t=124112
     
  4. Pretty sure the "mystery material is a cast iron Model A piston ring...
     
  5. Eyeball
    Joined: May 10, 2001
    Posts: 1,668

    Eyeball
    Member

    Yep and the break easily...... I used two of the kits to get mine done but next time I will modify the spindle.
     
  6. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,681

    Bruce Lancaster
    Member Emeritus

    I think maybe it was Neal in California who modified his spindles and plates.
     
  7. http://www.jalopyjournal.com/forum/showthread.php?t=124112

    I like the way how this person modified his backing plates. He took 3/8" steel plugs and welded them inside of the original mounting holes. He then ground the welded plugs down so that he would not take any of the original material from the backing plate. After that, he drilled his new holes. Maybe if I get some rings machined from 3/8" steel to match this gap, I could weld it to the plate and fill in the gap. I could then ground the excess down so that I would not have to modify the spindle or use the piston ring fill in. I don't know if it will work, but its worth a try.
     
  8. lowsquire
    Joined: Feb 21, 2002
    Posts: 2,567

    lowsquire
    Member
    from Austin, TX

    that will work too...but neals method is definitely more credible engineering wise, I just dont like how little support there is around that hole, and the amount you add with a ring welded inside the backing plate is very thin..would be hard to weld it fully without the edge melting away, its only about 1/8 right? that would be really tricky.
     
  9. Zodoff
    Joined: Aug 9, 2002
    Posts: 526

    Zodoff
    Member

    There is not so much pressure happening on that ring,especially if its made for a tight fit and welded. I would make a ring thou, instead of using a piston-ring.
    Bevel the edge on both the backingplate and the ring and tig it up ,it will be fine.

    Z.
     
  10. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,681

    Bruce Lancaster
    Member Emeritus

    The ring does just center the works...the real forces are torque around the center when braking, so the welding approaches are overkill, but very nice and crafty.
     
  11. wbrw32
    Joined: Oct 27, 2007
    Posts: 7,314

    wbrw32
    Member

    This is very true..all the extra work you guys are alluding to is totally
    unneccessary... All the adapter rings do is center the backing plate
    so you can bolt it on...however you still need the wheel bearing spacer ..its the most important.... Been doing this for fifty eight years
    and have had no failures!!!!!!! you know the saying"if it aint broke,
    fix it till it is"
     
  12. Well I am good at that. :D
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.