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Technical an 'is the juice worth the squeeze' question, 35-40 x member in 32 rails

Discussion in 'The Hokey Ass Message Board' started by nobby, May 5, 2024.

  1. nobby
    Joined: Jan 8, 2006
    Posts: 1,358

    nobby
    Member

    IS THE JUICE WORTH THE SQUEEZE,
    If you happened to have a few 35-40 chassis, and have some 32 rails
    would you fit the 35-40 x member, or buy one of them tube x's and be done with it, considering its going rhd and the brake fulcrum will need redoingh the other side.
    please remind me
    IF you have a 32 rear crossmember
    is the spring the same width and depth as a 35-40
    IF you have a 36 rear axle and radius rods, does it become simpler to build?
    is the pinion spline on a 36 axle the one that uses the later banjo axle open drive flange, from what rear end?
    I gather the bolt spacing on a 36 axle for back plates is the same as 40?
    IS it possible to
    fit rear 40 hubs to a 36 axle
    use the 11'' rear brakes from an f1 and convert to self adjusters
    by way ove opening tyhe hole in the backplate - fabbracobbling, et all, hub offsets and drum depth.
    is an f1 rear axle complete at 61 inches wiode too wide for a 32 with 6'' by 16 firestone white wall tyres, relative to say a 47'' wide king pin axle with f1 brakes, is the track difference too much
    .
     
  2. @krylon32 are you able to answer any of these questions?
    Let's start with the later x member with '32 frame rails.
     
  3. treb11
    Joined: Jan 21, 2006
    Posts: 4,102

    treb11
    ALLIANCE MEMBER

    '32 rails and 35-40 X is how I am building my chassis. There are several examples on the forum. You can add a brake pedal cutout on the RH x piece if you don't have a RHD donor chassis. See the P&J website for a pattern. But you would still have to find or fabricate a RHD pedal mount.

    https://www.peteandjakes.com/wp-content/uploads/2016/10/5010-front.pdf
     
    pprather likes this.
  4. Andy
    Joined: Nov 17, 2002
    Posts: 5,351

    Andy
    Member

    I had a local shop bend up some sheet metal channels. They were 4' long, 5.75" deep and 2" wide.
    It was really cheap and easy to fab up a real X member like all the cars in the 50's used. The Early Corvette used similar looking set ups.
    I did a torsion test on a stock 32 frame It twisted 2 "down from center of the front crossmember. With the new X member, the same load had no measurable deflection.
    P1060971.jpeg
    P1060972.jpeg P1060980.jpeg P1060977.jpeg
     
    Last edited: May 5, 2024
    Algoma56 and Just Gary like this.
  5. alchemy
    Joined: Sep 27, 2002
    Posts: 22,270

    alchemy
    Member

    Yes, yes, yes, no, no, no, no, yes, no, yes.
     
    Algoma56 and teach'm like this.
  6. nobby
    Joined: Jan 8, 2006
    Posts: 1,358

    nobby
    Member

    if you lay a steel rule flat against the front curvw of the frame - on the square part and measure back, is it exactly 15 inches to the middle of the crossmember - or the middle rivet?
     
  7. alchemy
    Joined: Sep 27, 2002
    Posts: 22,270

    alchemy
    Member

  8. nobby
    Joined: Jan 8, 2006
    Posts: 1,358

    nobby
    Member

    frame rails I have have already been boxed - boxed all the way to the front for some strange reason for ifs - right to the frame horn!!!

    so bending a steel rule on the top of the rail, at the front most edge and back,
    if you get my aggro -

    same in the rear
    I am going to buy a front crossmember then cut the trapesoidal shape from the boxing plate if you like and slide the crossmember in, tap the crossmember and bolt it in pre welding. - mocking up. maybe so it can be disassembled and stored in two.
    got a look at the plans
    14 and 7/16 from the front of the rail back and all that jazz
    BUT
    I am thinking it will be a whole lot ewasier
    using a 2 foot steel ruler
    and simply measuring the distance from the front horn backwards
    same in the rear, but need to get the 32 rear x member back - might not happen
     
  9. nobby
    Joined: Jan 8, 2006
    Posts: 1,358

    nobby
    Member

    I must ask
    why are there two versions of the model a STYLE 7 DEgree dropped front crossmember
    one is drilled for rivets one isn't, is it the exact same thing and simply made by two differing vendors?>??
     
  10. redo32
    Joined: Jul 16, 2008
    Posts: 2,270

    redo32
    Member

    @Andy tell us about the interesting front crossmember.
     
  11. nobby
    Joined: Jan 8, 2006
    Posts: 1,358

    nobby
    Member

  12. Andy
    Joined: Nov 17, 2002
    Posts: 5,351

    Andy
    Member

    P1030529.jpeg
    Way back in prehistory, I designed, built, and sold composite mono leaf springs. To get the spring rate low and also the stresses, I need to make the springs 3” wide. I have had this one under my roadster for 34 years so it must have worked. I had to make the crossmembers to fit the wide springs.
    Yes, it is designed with the bend to get it low.
     
    Last edited: May 6, 2024

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