Hope this doesn't come through twice, I forgot to remove the stuff at the
bottom on the first send.
Hi Gerald
I have 3 big saloons all running Superflex poly bushings, one has the very
early yellow bushes the others are both on the dark purple (look black in
the dark under a car) and all the cars are driven hard, one is a 2.5PI with
a TR5 spec engine, they have also been used for towing a trailer with
another big saloon on! On inspection recently when changing one of the
shackles to increase the negative camber I was impressed with how little
sign of wear there was. The yellow bushes are about 7 years old and the
purple about 4 or 5. The yellow are unknown mileage, as the car came with
them on, the purple ones each car has done in excess of 20k miles with them.
The bushings I use have a Stainless tube which is the same length as the
steel tube in the rubber bush, it is clamped and the rotation looks to
happen on the tube to poly interface.
I did re bush one of my cars with rubber which lasted less than 18 months,
modern rubber for our cars seems to all be sub standard from my experience
and that of others I have talked to.
I would also say that the road noise was only slightly increased on my cars.
I should also mention the improvement to handling and straight line
stability since fitting poly! I recon it returned the car to how it would
have been when new.
Hope this helps
Graham.
----- Original Message -----
From: "Gerald M Van Vlack" <jerryvv@alltel.net>
To: "FOT" <fot@autox.team.net>; "Triumphs" <triumphs@autox.team.net>
Sent: Wednesday, October 05, 2005 1:53 PM
Subject: Rear Trailing arm bushes IRS cars
> Lists,
> I recently responded to Dave Connitt's post on using some type of hard
> mount
> on his 4A steering rack, I was against doing so on a street car. I went on
> to
> opine on my thoughts regarding the general use of Poly mounts on street
> cars
> etc. We all have our opinions.
>
> I have a question for the list on the subject. Specifically the poly
> mounts
> for the IRS Trailing Arm attachment to frame pivot point. Properly
> installed
> rubber mounts rotate by the flex in the rubber itself and not via the
> through
> bolt that clamps the bushing between the mounting ears. That's not the
> case
> with the poly mounts, there is no flex in the poly hence the bearing
> becomes
> the bolt to sleeve interface or the sleeve to poly bush interface or maybe
> both. I don't recall for certain but I don't think the metal bushings are
> long
> enough to be clamped between the mounting ears and held stationary forcing
> the
> rotation to be between the bushing and the poly mount and not the bolt
> shaft
> to bushing. Has anyone inspected this installation after a few years of
> use?
> What was observed?
>
> To those suppliers who sell the poly bushing replacements and who read
> these
> lists. Do you know the engineering that applies? I'm using some from a
> well
> known "racing" supplier but I am suspect of the design input. I'm fairly
> certain that I'll go back to rubber in the future if I can find an
> adequate
> way to install new ones.
>
> Thanks,
>
> JVV
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