You definetly do NOT want the Solid Aluminum bushings, as these
transfer ALL of the shock loads and vibrations from the A-arm to the
fulcrum pin, it's mountings and the entire crossmember. Even the
Polyurethane bushings increase these shock loads, but not to the extent
of Solid Metal. I made some Delrin (Registered trade mark of
someone...DuPont I believe) for my Alpine, which seemed to work pretty
well, for the three months I had them in there. Delrin is a bit softer
than the typical Polyurethane ones are. The Basic old Rubber ones are
probably still the best thing for these cars unless racing, auto-X every
weekend type car.
Rich
> ----------
> From: Anita & Jim Barrett[SMTP:anitabrt@mindspring.com]
> Reply To: Anita & Jim Barrett
> Sent: Wednesday, July 16, 1997 5:36 PM
> To: tigers@autox.team.net
> Subject: Shimmy Cause
>
> Tiger People
> The shimmy in the front of my Tiger II 351C under braking was
> caused by the headers! Yes, that is what I said, the headers.
> While
> you think about that I will tell you about the disks. I used a dial
> indicator on both of them and they each had .0005 warp maximum.
> One wheel had .001 warp and the other had one place that was
> .027 warp. The hubs had a maximum of .005 warp on the face.
> But none of this warping was the cause of the shimmy. If you
> recall from my first letter, I replaced the upper A arm bushings. I
> found that the rear bushing had failed while the front bushing was
> fairly good. One of the header tubes pass within 3/4" of the end of
> the
> upper rear end of the A arm shaft. The heat from the header appears
> to be the cause of the failure of the bushing. Guess what? The same
> tube also passes within an inch of the lower A arm rear bushing.
> Tonight I checked the lower bushings and sure enough the rear bushing
> was badly worn on the side that has the nearby header tube. The
> other side rear has 2" from the header tube, but it was obvious that
> the
> bushing was worse than the front bushings, again due to the heat from
> the headers. As I have no lower bushings at the moment, I temporally
> added a rubber washer salavaged from the old upper front bushings
> between the steel washer and the bad bushings. On a test drive the
> shimmy was gone !
> Now my question is, is there a heat resistant bushing
> available?
> Is there any cross over from other car's bushings to the Tiger/Alpine
> lower bushing? Does anyone know a source for regular Tiger Bushings.
> Finally, has anyone had experience with solid aluminum bushings?
> One of my near term tasks is to aquire some of that header
> insulation tape and wrap my headers.
> Thank everyone who responded to my Shimmy question.
> Jim Barrett Tiger II 351C and others.
>
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