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Re: Delrin or poly...



>Delrin is not suitable for suspension bushes. The reason that
>polyeurethane is used is that, in most cases, more than rotation is
>involved. The bushes usually move in multiple arcs (in 3d) and delrin is
>much too stiff to accomodate this, meaning that the suspension arm
>itself has to accomodate the twist

In the case of the Sport Quattro, with its radius arms attached to the control
arms, or the early 4000/80 cars where the a/r bar is attached directly to the
control arms, you'd be correct.  However, the later (post '84) cars
(4000/80/90/Coupe/Ur-Q) have a different a/r setup and the control arm rotates
around only one axis.  For these cars, Delrin bushings will work just fine.

One trick that I recommend: When you install new bushings, drill out the
subframe to accept slightly oversize bolts and ream the bushings to match.  It
may be a PITA to get everything lined up but you'd be surprised how much slop
there is with the OEM parts, especially after the car's done 100k or so.

>Correctly installed polyeurethane
>(with correct lubricant) doesnt usually squeak.

Until its time to relube them, anyway.  For bushings, I prefer to use a
material like Turcite (green), which is a self-lubricating plastic ... not
cheap at $80+ per foot but it's quiet, sufficiently rigid and relatively easy
to machine.  It can be difficult to find in small quantities, though.

JG