Making Donuts from Lower Control Arm Bushes
#1
Making Donuts from Lower Control Arm Bushes
Hi,
The front lower wishbones on my car are sliding and chopping off the end under braking force. I have them pinned but it doesn't appear to be enough to hold them. The same thing has happened on both sides, and it's the second time this has happened. Approx. 15 events from new to this.
What am I doing wrong!?
Cheers
The front lower wishbones on my car are sliding and chopping off the end under braking force. I have them pinned but it doesn't appear to be enough to hold them. The same thing has happened on both sides, and it's the second time this has happened. Approx. 15 events from new to this.
What am I doing wrong!?
Cheers
#2
How freely do the control arms/bushing move when you install the arm in the car and push/pull it up and down?
I initially had problems with poly bushing binding due to the poly shoulders being too wide. Basically the bushings when installed in the arm were wider than the steel sleeve, so there is a lot of force being applied to them just to rotate the control arm. I ended up using a belt sander to reduce the shoulder thickness of the bushings, which made the arms fit easier in the subframe and the arms move much more freely.
I initially had problems with poly bushing binding due to the poly shoulders being too wide. Basically the bushings when installed in the arm were wider than the steel sleeve, so there is a lot of force being applied to them just to rotate the control arm. I ended up using a belt sander to reduce the shoulder thickness of the bushings, which made the arms fit easier in the subframe and the arms move much more freely.
#4
Delrin is the answer.
Check out the Bushing Megathread: https://www.miataturbo.net/suspensio...cussion-87573/
Under track braking conditions the thrust force is pushing the armforward "rearward" and crushing/cutting through the rubber bushing collar.
Check out the Bushing Megathread: https://www.miataturbo.net/suspensio...cussion-87573/
Under track braking conditions the thrust force is pushing the arm
Last edited by AussieMSM; 01-14-2022 at 09:02 PM.
#7
Why not replace those "doughnuts" with steel washers?
Chop the bushing down to the sleeve and have a thick washer (with the sleeve going through) take up the slop on the rear sides of the arms.
It will make some noise of course, maybe some softer material between this washer and the subframe?
Chop the bushing down to the sleeve and have a thick washer (with the sleeve going through) take up the slop on the rear sides of the arms.
It will make some noise of course, maybe some softer material between this washer and the subframe?
#8
Definitely not steel. Some sort of POM plastic would be what I would use. Nielex makes a similar product, albeit for OEM and their bushings.
https://nielex.net/footwork_as.html
https://nielex.net/footwork_as.html
#10
The poly bronze thing just stops the poly binding. Different issue to what you're having. The delrin bushing (think of it as a solid bushing) takes all the thrust forces so the control arm cant shift rearwards and cut into the other bushing. What you use in the second bush position is up to you (rubber/poly etc).
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