Rear control arm bushings

[Merritt5]

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.

https://static1.pt-content.com/images/pt/2018/08/42410331520_a5de3ceb60_c-1.jpg (https://flic.kr/p/27BE31q)

[killer69]

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

[CSG]

If you run both uppers and a panhard then run rubber. If running the PM3L then delrin should be fine.

[Merritt5]

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?

[CSG]

Looks just like the UMI adjustable ones

[Merritt5]

Looks just like the UMI adjustable ones

Hmm...may have to give them a call. Thanks!

[CSG]

I have a set of the UMI's if you need any measurements.

[Mark@lateral-dynamics]

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

[Merritt5]

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.