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Technical Rear Suspension question

Discussion in 'Traditional Hot Rods' started by Boon BA, Jul 29, 2015.

  1. Boon BA
    Joined: Jan 12, 2012
    Posts: 89

    Boon BA
    Member

    1930 Model A (7).jpg If I have Deuce rails, Buggy Spring and split bones mounted on a cross member, Do I need a pan hard bar on my Banjo rear end?
     
  2. Loaded question.
    With short shackles and no wag in them - you don't need one, but its not going to hurt to have it.

    If I only had room for one, Id rather have an anti roll bar.
     
  3. Mike VV
    Joined: Sep 28, 2010
    Posts: 3,329

    Mike VV
    Member
    from SoCal

    What 31Vicky said. The the Panhard rod the anti-sway bar do two different things.
    Just for the accuracy of it, Panhard is one word, the guys name who came up with the idea.

    Mike
     
  4. HOTRODPRIMER
    Joined: Jan 3, 2003
    Posts: 64,719

    HOTRODPRIMER
    ALLIANCE MEMBER

    Open drive,I would use one.

    BTW, The ch***is looks great . HRP
     
  5. Kerrynzl
    Joined: Jun 20, 2010
    Posts: 3,596

    Kerrynzl
    Member

    put longer shackles in it so they are more vertical, then use a panhard.
    The shackles can "float" enough to eliminate any binding with the panhard.
     
  6. With open drive what you really need is a torque arm. You have done more then one thing when you split the bones and took away the closed drive shaft (torque tube), you have lost a little triangulation and you have loaded a lot of the stress that the torque tube used to take up on the bones.
     
  7. ct1932ford
    Joined: Dec 3, 2010
    Posts: 13,258

    ct1932ford
    ALLIANCE MEMBER

    What are you building? Like the green. The guys above have it right.
     
  8. pitman
    Joined: May 14, 2006
    Posts: 5,148

    pitman

    Tall closed cars tend to roll more than the open versions.
     
  9. krylon32
    Joined: Jan 29, 2006
    Posts: 10,871

    krylon32
    ALLIANCE MEMBER
    from Nebraska

    Have built 100's of buggy spring rear suspensions with ladder bars and to date have never used a panard bar. I always design the suspension so the shackles are at a 45 degree angle under a load. I have had no customer complaints yet. All three of my current deuces, (3 window, delivery and roadster) have buggy spring rear suspension. I do agree with the need for a torque arm since you are using the early bones.
     
    AHotRod likes this.
  10. Boon BA
    Joined: Jan 12, 2012
    Posts: 89

    Boon BA
    Member

    "What are you building? Like the green. The guys above have it right."

    It's a finished car that I just bought. Going through it and want to "fix" anything before I get too far down the road.

    Thanks for the responses. Here's a pic of the car.
    Boon

    1930 Model A (11).jpg
     
  11. RB35
    Joined: Dec 15, 2006
    Posts: 964

    RB35
    Member

  12. Yep! Nice one

    Panhard bar keeps the rear centered left and right during suspension travel.

    Torque arm keeps the rear end from rolling under torque load from engine or braking.

    Anti sway bar helps with body roll on buggy springs
     
  13. dad-bud
    Joined: Aug 22, 2009
    Posts: 3,884

    dad-bud
    Member

    Boon, your coupe looks great.
    Suggest you listen to those recommending a panhard bar plus torque arm - they're giving good advice.
    Cheers.
     
  14. Funny no one mentioned watts link. :D
     
  15. bgaro
    Joined: Sep 3, 2010
    Posts: 1,189

    bgaro
    Member

    what ****** said. i'm seeing a torque arm being more affective for this set up.
     
  16. I have actually spent the last hour or so looking for a pic of the Raven launching the '27 @ MOKAN, 5" wide tires (traction impaired) mild 355 and light car. The split bones are a rainbow. we have since gone to ladder bars.
     
  17. a friend of mine built that car , the only thing i would add if it was mine is a torque arm as suggested ...no need for a rear panhard
     
  18. 117harv
    Joined: Nov 12, 2009
    Posts: 6,586

    117harv
    Member

    The car already has a panhard bar, it's also called a spring. As for the torque arm being needed, it depends on what bones and how they are mounted as well as horse power. Since it is a finished driving car I would think all is in order...no?
     
  19. alchemy
    Joined: Sep 27, 2002
    Posts: 22,661

    alchemy
    Member

    Do you have a problem of tires scrubbing the body when you are "drifting"? No? Then no need to add the Panhard. As stated above, a shackle at 45 degrees does the job of keeping the axle in the correct position side-to-side.
     
  20. Fuzzy Knight
    Joined: Jun 8, 2009
    Posts: 11,806

    Fuzzy Knight
    Member
    from Santee, Ca

    I see no need for a Panhard bar on a buggy sprung car. Period!!!
     
  21. Boon BA
    Joined: Jan 12, 2012
    Posts: 89

    Boon BA
    Member

    Thanks guys. I'll drive it and decide if any corrections are needed. :)
     

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