Register now to get rid of these ads!

Technical Spring perch question

Discussion in 'The Hokey Ass Message Board' started by chrisp, Feb 21, 2025 at 10:08 AM.

  1. chrisp
    Joined: Jan 27, 2007
    Posts: 1,182

    chrisp
    Member

    I guess I'm not the only one who faced this but I couldn't find the answer.
    I'm assembling a 4" dropped aftermarket I beam for a model A with split '46/'48 bones, but I'd like to keep lever shocks.
    I don't know the length of the '32/'34 perch are they longer than the A spring perch? Are they the one to use?
    Is there an aftermarket one for this application ? In that case is there a risk of interference with the taller ball placement and the steering arm?
    Alternatively which is what I am leaning toward, I do have aftermarket spring perches, can I cut the ball from the A and weld them onto the aftermarket ones?
    Or is there another way to achieve this?
    [​IMG]
     
  2. alchemy
    Joined: Sep 27, 2002
    Posts: 21,710

    alchemy
    Member

    The 32 axle is 2” at the perch but the wishbone has thicker bungs on the yoke. I’d think the 32 perch length is very similar to the A perch length. But, the shock mount on a 32 perch sticks up a lot higher than it does on the A as shown in your pic.

    Neither perch is probably long enough to reach all the way through the 46 wishbone yoke. But, you can machine the taper where the perch sits even deeper into the wishbone so it can reach through.

    There are repro 32 perches on the market. They are probably the same as original dimensions. Maybe the best option is to weld some original shock ball mounts onto a pair of repro perches, as they are all much longer to accommodate the new style lower shock mounts. Just make sure you get some forged ones, not cast.

    https://www.summitracing.com/search...-OtkCUWF4EVuWUq-pE462PXCcsSSeiM1iJ2GZLirEb90t
     
  3. chrisp
    Joined: Jan 27, 2007
    Posts: 1,182

    chrisp
    Member

    Thanks, I don't know what kind of repops I have, it was part of a trade deal. I very much suspect that they and the I beam came from speedway in around 2010.
    How could I know what it is without breaking it?
    What about brazing if it's cast?
     
  4. alchemy
    Joined: Sep 27, 2002
    Posts: 21,710

    alchemy
    Member

    Can you see a parting line where the two halves of the molds or the dies came together? If its thin then you can guarantee its cast. If its thicker then it might be forged, or the thin casting line was ground on.

    Some metallurgists could probably tell you the metal type depending on the sparks made when grinding it, but I can’t.
     
  5. dana barlow
    Joined: May 30, 2006
    Posts: 5,263

    dana barlow
    Member
    from Miami Fla.
    1. Y-blocks

    As for axle,hold it up with one hand from the end,or hang it with wire. Hit with hammer about the center one time;= hear the sound it makes:Do_O:cool:=if thud = cast,,If it rings= Forged. Same thing works for crankshafts.
     
    X-cpe, Papas32, Robdski and 1 other person like this.

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.