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Technical Ford model A front cross member question on AV8 build

Discussion in 'Traditional Hot Rods' started by MR K., Oct 24, 2016.

  1. MR K.
    Joined: Aug 20, 2009
    Posts: 578

    MR K.
    Member

    So on my roadster I am building I have the rear end where it needs to sit. That is with the frame almost level..little lower in the front. The rear cross member i have tilted back 3 degrees. The front member i have tilted it back 7 degrees. But between the frame and front cross member i have a ugly gap to fill on top now. I figure with the members in the correct angle the spring wont bind. Or do i make the member flush with the frame....which may bind my spring a bit when i tilt my axel 5 to 7 deg back.

    Sent from my LGUS991 using The H.A.M.B. mobile app
     
  2. MR K.
    Joined: Aug 20, 2009
    Posts: 578

    MR K.
    Member

    My gut tells me just weld the big gap. The spring will move better with the correct geometry. Guess i jusy talked myself into it.

    Sent from my LGUS991 using The H.A.M.B. mobile app
     
  3. cretin
    Joined: Oct 10, 2006
    Posts: 2,857

    cretin
    Member

    How about a photo of what you've got going on?
    "big gap" is a bit of a relative term.
     
  4. I guess I'm not understanding what's going on here. I thought the Model A front crossmember already had the proper tilt built into it.
     
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  5. 1946caddy
    Joined: Dec 18, 2013
    Posts: 1,510

    1946caddy
    Member
    from washington

  6. Model A Gomez
    Joined: Aug 26, 2006
    Posts: 1,120

    Model A Gomez
    Member

    I think Late to the Party is right, the crossmember has a built in angle. The crossmember is set in the stock frame straight and the front axle has the proper angle.
     
    Late to the Party likes this.
  7. MR K.
    Joined: Aug 20, 2009
    Posts: 578

    MR K.
    Member

  8. MR K.
    Joined: Aug 20, 2009
    Posts: 578

    MR K.
    Member

  9. MR K.
    Joined: Aug 20, 2009
    Posts: 578

    MR K.
    Member

    This is tiled back 7 deg. Which is what my axle and spring should be

    Sent from my LGUS991 using The H.A.M.B. mobile app
     
  10. MR K.
    Joined: Aug 20, 2009
    Posts: 578

    MR K.
    Member

    Just mocking and tacking things up..and this just looks....well...just not right.

    Sent from my LGUS991 using The H.A.M.B. mobile app
     
  11. Atwater Mike
    Joined: May 31, 2002
    Posts: 9,855

    Atwater Mike
    ALLIANCE MEMBER

    Lay, Mr. K...an angle finder on the center of the member. You will see that there is already a 'manufactured twist', amounting to 7 degrees positive MORE than the 'flats' where it joins onto the frame. (looks like you have more at the center now, like 12... just a guess.
    But bear in mind one thing: Any frame 'rake' you end up with must be subtracted from the caster in the front member.
    Uhh...That'd be 7 degrees from LEVEL, and that is level with Terra Firma, that being the ground.
     
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  12. MR K.
    Joined: Aug 20, 2009
    Posts: 578

    MR K.
    Member

  13. BJR
    Joined: Mar 11, 2005
    Posts: 6,007

    BJR
    Member

    Are you measuring at the ends of the crossmember, or where the spring mounts to? Should measure the angle where the spring mounts.
     
  14. MR K.
    Joined: Aug 20, 2009
    Posts: 578

    MR K.
    Member

    I will need to look at the new member. I did know they had that built into them. I knew the orginal did.

    Sent from my LGUS991 using The H.A.M.B. mobile app
     
  15. MR K.
    Joined: Aug 20, 2009
    Posts: 578

    MR K.
    Member

  16. MR K.
    Joined: Aug 20, 2009
    Posts: 578

    MR K.
    Member

    At ride height with and angle finder on the center front its tilted back 7.5 degrees.

    Sent from my LGUS991 using The H.A.M.B. mobile app
     
  17. MR K.
    Joined: Aug 20, 2009
    Posts: 578

    MR K.
    Member

    Center, front surface of the crossmember.

    Sent from my LGUS991 using The H.A.M.B. mobile app
     
  18. MR K.
    Joined: Aug 20, 2009
    Posts: 578

    MR K.
    Member

    My frame rake is 2 degrees down..so your saying my angle should be 5

    Sent from my LGUS991 using The H.A.M.B. mobile app
     
  19. Guylian
    Joined: Mar 25, 2011
    Posts: 26

    Guylian
    ALLIANCE MEMBER

    Mr K, Look at Edward Lloyd build threads from Germany. He shows how to address your gap problem!!!!!
     
  20. MR K.
    Joined: Aug 20, 2009
    Posts: 578

    MR K.
    Member

    thanks guys! great stuff
     
  21. Did you end up just welding it in? My first thought would be this would really throw off your radiator angle, thus your hood length and gaps. I didn't do anything to the crossmember in my car and I am running 5 degrees of positive caster on my front axle
     
  22. MR K.
    Joined: Aug 20, 2009
    Posts: 578

    MR K.
    Member

    No i just have things tacked. Im going to get the top flush with frame. Then re tack. I did know it had 5 deg built into it. But frame goes 1.5 degrees down to the front. So maybe a small adjustment might be needed

    Sent from my LGUS991 using The H.A.M.B. mobile app
     
  23. Barrelnose pickup
    Joined: Aug 20, 2008
    Posts: 897

    Barrelnose pickup
    ALLIANCE MEMBER

    Centre front surface?
    Shouldn't you be centre,on top of crossmember or am I getting it wrong?
     
  24. bct
    Joined: Apr 4, 2005
    Posts: 3,068

    bct
    Member

    Who is the manufacturer of your cross member?
     
  25. MR K.
    Joined: Aug 20, 2009
    Posts: 578

    MR K.
    Member

    bct likes this.
  26. MR K.
    Joined: Aug 20, 2009
    Posts: 578

    MR K.
    Member

    Your right. I was wrong.

    Sent from my LGUS991 using The H.A.M.B. mobile app
     
  27. Barrelnose pickup
    Joined: Aug 20, 2008
    Posts: 897

    Barrelnose pickup
    ALLIANCE MEMBER

    All good,people who haven't made a mistake haven't made anything.
     
    nailed31 likes this.

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