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    Results 1 to 9 of 9
    1. #1
      Join Date
      Sep 2016
      Posts
      40

      Rear control arm bushings

      Is there any benefit to running Delrin vs poly bushings in rear control arms?

      Here is a control arm I'm designing for my mustang. I'm moving the sway bar forward to clear my panhard bar.

      1993 Fox Body...its in the works
      https://www.pro-touring.com/threads/...72#post1249772

      1972 Nova...OUT OF THE BARN!!!!! Build coming soon!

      IG:@kdmerritt5 for more

    2. #2
      Join Date
      Mar 2005
      Location
      St George Utah
      Posts
      1,243
      Country Flag: United States
      Are you removing 1 of the upper control arms?
      you cant run a panhard bar on a triangulated 4 link it will bond something terrible.

      but to answer your original question i would run delrin

      i would think about running the heim at the front mount also less bending load on it
      Last edited by killer69; 08-23-2018 at 06:35 AM.
      Blake Foster
      www.speedtechperformance.com
      435-628-4300
      St. George Utah.
      it's always sunny here.

    3. #3
      Join Date
      Nov 2016
      Location
      Sulphur, La
      Posts
      613
      If you run both uppers and a panhard then run rubber. If running the PM3L then delrin should be fine.

    4. #4
      Join Date
      Sep 2016
      Posts
      40
      Quote Originally Posted by killer69 View Post
      Are you removing 1 of the upper control arms?
      you cant run a panhard bar on a triangulated 4 link it will bond something terrible.

      but to answer your original question i would run delrin

      i would think about running the heim at the front mount also less bending load on it
      I made a 3-link for the rear.

      I put the heim in the rear so I could have move the sway bar bracket forward.

      Is there a big difference in the heim being in the front vs the rear?
      1993 Fox Body...its in the works
      https://www.pro-touring.com/threads/...72#post1249772

      1972 Nova...OUT OF THE BARN!!!!! Build coming soon!

      IG:@kdmerritt5 for more

    5. #5
      Join Date
      Nov 2016
      Location
      Sulphur, La
      Posts
      613
      Looks just like the UMI adjustable ones

    6. #6
      Join Date
      Sep 2016
      Posts
      40
      Quote Originally Posted by CSG View Post
      Looks just like the UMI adjustable ones
      Hmm...may have to give them a call. Thanks!
      1993 Fox Body...its in the works
      https://www.pro-touring.com/threads/...72#post1249772

      1972 Nova...OUT OF THE BARN!!!!! Build coming soon!

      IG:@kdmerritt5 for more

    7. #7
      Join Date
      Nov 2016
      Location
      Sulphur, La
      Posts
      613
      I have a set of the UMI's if you need any measurements.

    8. #8
      Join Date
      May 2018
      Location
      San Diego County
      Posts
      72
      Country Flag: United States
      Because the rear axle has to move up and down, as well as roll, you need compliance in ALL bushings that are used for the 3 Links - meaning rubber, Johnny Joints, or heims. Poly would work, but is horrible in this application and will bind, it is too stiff to give enough compliance to allow the axle to roll properly. Delrin will not work without significant binding, it might "work," but in reality the axle won't roll unless it is bending something (some combination of axle tubes, frame pickup points, etc). 3-Link is "the" way to go with a stick rear axle, let it do it's job properly by using the right bushings. An excellent choice would be a properly sized heim up front, and a rubber bushing in the rear - this offers a bit of reduced harshness relative to two heims. If it were my car, I'd go with heims of appropriate rating and quality (FK is an excellent brand).

      Mark
      Mark Magers

      Founder and Principal, Lateral Dynamics LLC
      [email protected]
      lateral-dynamics.com

      One tenth of a second on the race track is often the difference between first place, and fourth.

    9. #9
      Join Date
      Sep 2016
      Posts
      40
      Quote Originally Posted by Mark@lateral-dynamics View Post
      Because the rear axle has to move up and down, as well as roll, you need compliance in ALL bushings that are used for the 3 Links - meaning rubber, Johnny Joints, or heims. Poly would work, but is horrible in this application and will bind, it is too stiff to give enough compliance to allow the axle to roll properly. Delrin will not work without significant binding, it might "work," but in reality the axle won't roll unless it is bending something (some combination of axle tubes, frame pickup points, etc). 3-Link is "the" way to go with a stick rear axle, let it do it's job properly by using the right bushings. An excellent choice would be a properly sized heim up front, and a rubber bushing in the rear - this offers a bit of reduced harshness relative to two heims. If it were my car, I'd go with heims of appropriate rating and quality (FK is an excellent brand).

      Mark
      Thanks for the reply and going into some detail, Mark.

      1993 Fox Body...its in the works
      https://www.pro-touring.com/threads/...72#post1249772

      1972 Nova...OUT OF THE BARN!!!!! Build coming soon!

      IG:@kdmerritt5 for more





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