[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
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