Tapping with a hammer would probably tell you a whole lot. Jim
________________________________
From: Larry Young <cartravel@pobox.com>
To:
fot@autox.team.net
Sent: Thu, January 10, 2013 10:27:39 AM
Subject: Re: [Fot]
TR CHASSIS FATIGUE - A CAUTIONARY TALE
I don't think anyone mentioned that
the IRS cars are notorious for weakness in
the mounts for the differential
and the brackets up front where the lower A arms
mount. These usually fail
without the added stresses of racing. I did a frame
off restoration of my
TR250 last year. It has resided in Oklahoma (a relatively
dry state) and
been garaged for all but its first 6 years. It body was
relatively rust free
as Triumphs go (solid floors, etc). After repairing and
reinforcing the
usual problem areas, I noticed a very small pinhole on the
bottom near the
center (called the T-shirt) area. The thin metal was only a few
square
inches and may have been partially because it had scraped bottom there at
some point. Since these frames rust from the inside, I wonder how many are
out
there with thin metal, which has not yet rusted all the way through? It
seems
that a visual inspection is not sufficient. Is there some sort of sonic
testing
device which could be used to check it over.
Larry
On 1/10/2013 5:47
AM, yellow04@tr4racer.com wrote:
> Good question.
>
> The ladder frames under
the TR2-TR4 seem to be much more rust resistant than
> the wishbone frames
under the TR4A-TR6. I have come across numerous ru
> project cars over the
years, and have seen plenty of rusted out TR3's and
> 4's with what appear to
be good frames, but I have never seen a rusty TR4A,
> 250 or 6 that did not
need extensive frame work. I should add I have come
> across plenty of nice
wishbone framed Triumphs sitting on frames in dire
> need of attention.
>
> I
know the spring towers and cross members are different between the ladder
>
and wishbone frames, and I believe the newer wishbone frame design is more
>
robust. However, because of their propensity for rust, I'd venture a guess
>
that the wishbone framed cars share the probability of failure in the areas
>
Joe mentioned.
> A
> Remember, the stess we put on these cars running them on
track with today's
> racing tires is way beyond what the designers ever
dreamed possible. You
> need to reinforce many key areas, keep the frame
clean, paint it with
> something that will not hide cracks, and be very
diligent with close
> inspections between race weekends.
>
> Henry
>
yellow04@tr4racer.com
> ----- Original Message -----
> From: "sherry robyn"
<sherryjimmy6116@att.net>
> Subject: Re: [Fot] TR CHASSIS FATIGUE - A
CAUTIONARY TALE
>
>
>> Do TR6s (1974) have this weakness also?
>
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