[200q20v] Delrin/ urethane bushing alternative

[Bernie Benz]

Hi Brandon, here is my critique of this, needle bearing idea for control
arms.

1.  Low friction is not a critera.  You are purposefully and more
effectively adding friction to the suspension system with the hydraulic
damper, the shock.

2.  Needle bearings require extreem concentricity and parallelism accuracy
of the bearing axes to achieve needle line contact rather than destructive
end point contact within the bearing.  To achieve this in an A frame control
arm system would require line boring of the A frame and a single,
continuous, and straight shaft thru both bushings.  These are the same, but
much more demanding requirements than that of a good Delrin bushing design,
which has not been achieved by the aftermarket.  Impossible in a single
bushing arm such as used in the 44 chassis.

3.  The application demands a bearing system having more than one degree of
freedom!  Such as a ball joint, or the stock elastomeric bushing.

Bernie

> From: Brandon Hull <brandon at cardinalpartners.com>
> Date: Tue, 2 Oct 2001 09:31:55 -0400
> To: "Audi 20V (E-mail)" <audi20v at rennlist.org>, "s-car-list at egroups.com
> (E-mail)" <s-car-list at egroups.com>, "200q20v (E-mail)" <200q20v at audifans.com>
> Subject: [200q20v] Delrin/ urethane bushing alternative
> 
> I happened upon this fascinating site today:  Shine Racing, a VW tuner in MA
> makes a needle bearing bushing insert for suspension control arms.  The
> advantage would be near zero friction in the suspension movement, with zero
> play.  (maybe a bad thing as has been discussed, if we assume mass
> production engineering factors in some slop here to accomodate production
> variances)  
> 
> In any event, I'm curious to know if anyone has pursued this for Audi
> applications.
> http://www.srsvw.com/basic.htm
> 
> A step by step Porsche installation:
> http://www.all914.com/projects/ScottY/Part1/index.htm
> 
> Brandon Hull
> eS2
> 911SC
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