Late 928 Control Arm Bushing Dimensions
Thread Starter
Rennlist Member
Joined: Feb 2015
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From: PA
Late 928 Control Arm Bushing Dimensions
Hello,
I'm about to make some 3d printed molds for polyurethane bushings for my S4 and, before I begin removing the control arms for my car and making it useless for a couple of weeks, I wanted to know if someone had dimensions for these bushings so I can start working right away with this project.
Also, are all these bushings the same as an early car? I know the suspension is different on early cars, but are also the bushings different?
Thanks to everyone in advanced!!,
Manuel
I'm about to make some 3d printed molds for polyurethane bushings for my S4 and, before I begin removing the control arms for my car and making it useless for a couple of weeks, I wanted to know if someone had dimensions for these bushings so I can start working right away with this project.
Also, are all these bushings the same as an early car? I know the suspension is different on early cars, but are also the bushings different?
Thanks to everyone in advanced!!,
Manuel
Former Vendor
Joined: Feb 2005
Posts: 15,228
Likes: 2,530
From: Anaheim
Just because you can do this, doesn't mean you should.
A couple of weeks ago, I pointed out the role the rubber bushings play in the front spring rate and the shock valving, in two separate threads.
You might want to read those threads and think about this, before wasting too much time and effort.....
A couple of weeks ago, I pointed out the role the rubber bushings play in the front spring rate and the shock valving, in two separate threads.
You might want to read those threads and think about this, before wasting too much time and effort.....
Chronic Tool Dropper
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From: Bend, Oregon
Manuel--
Head Greg's guidance on this.
If you decide that you must try this, the bushings you make will be bonded (molded in place) to the arm and the control shaft, with the control shaft at a "normal ride height position" during your exercise. The only alternative is to find or fabricate sleeves that press-fit in the arms and fit snugly over the inner control shaft ends. You can then mold your urethane in and around the sleeves, so they can be pressed into the arms and clamped on the control shaft with the nuts.
The key to all this is that there is no slippage between the bushings and the car bits when installed. Poly bushings have been marketed as replacements for suspension bushings on cars that have pieces that slide, and the poly is a bearing surface. In the 928, the suspension movement tries to distort the bushing material, a trait that's essential to the function of the suspension in service. No slipping is tolerated.
Head Greg's guidance on this.
If you decide that you must try this, the bushings you make will be bonded (molded in place) to the arm and the control shaft, with the control shaft at a "normal ride height position" during your exercise. The only alternative is to find or fabricate sleeves that press-fit in the arms and fit snugly over the inner control shaft ends. You can then mold your urethane in and around the sleeves, so they can be pressed into the arms and clamped on the control shaft with the nuts.
The key to all this is that there is no slippage between the bushings and the car bits when installed. Poly bushings have been marketed as replacements for suspension bushings on cars that have pieces that slide, and the poly is a bearing surface. In the 928, the suspension movement tries to distort the bushing material, a trait that's essential to the function of the suspension in service. No slipping is tolerated.
