Poly diff mounts and upper suspension bushes are fabulous on a street car.
They do offer some flex. The trailing arm bushes I have used collapsed over
time. I also like the solid rack mounts.
Bob Kramer
rkramer3@austin.rr.com
----- Original Message -----
From: "Bill Babcock" <BillB@bnj.com>
To: "'Gerald M Van Vlack'" <jerryvv@alltel.net>; "FOT" <fot@autox.team.net>;
"Triumphs" <triumphs@autox.team.net>
Sent: Wednesday, October 05, 2005 8:55 AM
Subject: RE: Rear Trailing arm bushes IRS cars
>I would think poly mounts on a street car would be hideous. I guess people
> always think stiffer is better for the same reason they think bigger is
> better. A certain Freudian sense of longing perhaps? In a race car we're
> looking for precision and don't mind replacing bits that wear out in a
> year.
>
> -----Original Message-----
> From: owner-fot@autox.team.net [mailto:owner-fot@autox.team.net] On Behalf
> Of Gerald M Van Vlack
> Sent: Wednesday, October 05, 2005 5:54 AM
> To: FOT; Triumphs
> 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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