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Technical AV8/F1 Crossmember -- HELP!!!

Discussion in 'Traditional Hot Rods' started by Crookshanks, Oct 3, 2023.

  1. Crookshanks
    Joined: Dec 16, 2010
    Posts: 368

    Crookshanks
    Member

    Ok, I need some solid guidance from the knowledge base as I've hit a crossroad in regard to my crossmember setup. I opted to use the F1 setup with F1 pedal set - still not sure if that was the best plan, but I'm determined to see it through now.

    I set the engine mount location up for adequate fan clearance and worked my way back from there for the crossmember location. Also have a spare cowl I mounted to check firewall clearance. I've noticed my trans mount location is a bit closer to the original crossmember than many others I've seen. I clearanced the torque tube opening and also mounted the bolt-on supports for the split bones. My biggest concern at this point is access to the clamshell assembly and speedo gear. Also think I may run into issues with access to my master cylinder (double reservoir). I'm out of room to move the trans mount up and don't really want to mess with the harmony of everything else. I figure at this point I can:
    • Continue cutting on the original crossmember for access to for clamshell and master
    • Take out the original crossmember and add some of Pinewood's K-Braces
    • Change up the mounts for my bones to under frame/welded to move up trans mount, however the geometry is good where I'm at in regard to caster and tie tie rod over bones setup.
    Appreciate any input form you guys.
     

    Attached Files:

  2. Troubadour85
    Joined: Mar 3, 2022
    Posts: 140

    Troubadour85
    Member
    from Dayton, OH

    Just my .02 but I would consider spending the money on making it a K-member. It looks less redundant and function built rather than two crossmembers stacked on each other... The clearance issues vary between cars from what I've seen on builds and no one frame and firewall are the same. I don't have pictures but mine is similar to Pinewood's (just not as pretty lol). However, I don't see and real issue with what you have now as long as the pivot has range of movement and you can access what you need on the shell.
     
    Crookshanks likes this.
  3. walter
    Joined: Nov 4, 2007
    Posts: 635

    walter
    Member

    I used a 32 crossmember and avoided a lot of problems. Gave me Master cylinder mounting, 32 pedals,
    and rear transmission mount. All bolt together just like Henry.
     
    Crookshanks and big duece like this.
  4. Crookshanks
    Joined: Dec 16, 2010
    Posts: 368

    Crookshanks
    Member

    Yes, still considering 32 as well. Might be glad I did down the road.
     
  5. Tim
    Joined: Mar 2, 2001
    Posts: 19,935

    Tim
    Member
    from KCMO

    I think you’ve got enough room with an open/ closed wrench to get at the clam shell stuff. Even better if you have removable floor boards. You’re not gonna be fucking with it all the time. If you wanted room for a ratchet you could make a little round notch in that flanged edge above it and call it a day

    I don’t see exactly how the master fits but I’m assuming rear facing? What kind of master it is will also play a factor but I think it’s workable with some imagination
     
    Outback, Crookshanks and Budget36 like this.
  6. Crookshanks
    Joined: Dec 16, 2010
    Posts: 368

    Crookshanks
    Member

    I think you are right about a few minor cuts to the main crossmember. Master is a double reservoir, so access to that top cap/clip will be necessary, but as long as floor is removable, maybe this will work.
     
  7. sdroadster
    Joined: Jul 27, 2006
    Posts: 447

    sdroadster
    Member

    I am using a 65 Mustang fruit jar master cylinder. They fit well, and are about $50.00 on Rock Auto. Simple..
     
    Crookshanks likes this.
  8. The 32 crossmember would be great.....if you can find one. Think I would remove the A bone crossmember ,and box a few inches of the frame where needed,and add a simple K member.You might even incorporate the master cylinder mount as part of it.
     
    Crookshanks likes this.
  9. Tim
    Joined: Mar 2, 2001
    Posts: 19,935

    Tim
    Member
    from KCMO

    If you have removable floor boards and the lid can come off the master with out to much hassle
    You can fill the level with a funnel.

    I can’t remember what a stock A uses the big holes on top of that cross member for but one located over the master with a plastic/ rubber plug would make for an easy check and fill access/ sight hole.

    I think that You’re so far along that a little notch and clearance hole are probably the way to go. If you were starting fresh there’s probably a “better” way to do it but for the work required to change it I don’t know if it’s worth the small amount of ease to service you’d gain
     
  10. Model A Gomez
    Joined: Aug 26, 2006
    Posts: 1,826

    Model A Gomez
    Member

    I've done two flathead V8 A's with a tube crossmember I built with no problems, your trans is a little farther back but don't see a problem. I use a couple of wrenches to remove the clam shell and have a removable floor, my master cylinder is mounted on the crossmember.

    c3.jpg


    cs.jpg
     
    Crookshanks likes this.
  11. Crookshanks
    Joined: Dec 16, 2010
    Posts: 368

    Crookshanks
    Member

    Agreed
    Think I'm gonna take your advice and give it a whirl with some access cuts. Can always go another route afterward!
     
  12. Crookshanks
    Joined: Dec 16, 2010
    Posts: 368

    Crookshanks
    Member

    Nice looking crossmember!
     
  13. Budweiser
    Joined: Jul 30, 2012
    Posts: 115

    Budweiser
    Member
    from california

    Looks good man, I’ve used it on my 29 roadster. Check out the one I made out of 3/16 plate. Can’t find the f-1 crossmembers right now. I’m building a 1930 coupe with flathead.
     

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