[Healeys] Down Pipes - The Final Saga

[Neil McDonald]

An exciting subject indeed!

I am about to fit an unused mild steel down pipe that I have had on the
shelf for maybe ten years. No sign of rust but I am away from home right
now so can not test it for flex. I might zap it with WD40 before fitting -
can’t hurt.

The question is - when brand new do the mild steel down pipes ever show any
sign of flex?

Neil
BN6

On Thu, Oct 24, 2019 at 2:42 PM Perry via Healeys <healeys at autox.team.net>
wrote:

> Listers
>
> As a follow up to my post on 10/18 on this exciting subject, I decided to
> do an experiment with a couple downpipes I had in the parts bin. Both pipes
> are new old stock and have never been on a car.  One is stainless and the
> other mild steel. Both have been laying on a shelf in the garage for at
> least 9 years.
>
> The test was to measure how much deflection was noted in the flex portion
> of the downpipe when the tip (where it enters the muffler) is loaded with a
> weight. The upper portion of the pipe was firmly held by the bench vice.
>
> Should have started with something less then 10 pounds but the stainless
> moved considerably under that weight.  The mild steel did not budge.
>
> At 47 pounds I heard a creaky noise but no movement on the mild steel. I
> then applied an unspecified force with my hand to the 47 pounds and no
> movement.
>
> My conclusion is that the mild steel flex pipe, once it takes a set, ie,
> Gets Rusty, does not flex. It is the weak link that will fail but it might
> as well be a piece of regular pipe.
>
> Perry
>
>
>
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>
>
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____________________
Neil & Pam McDonald

Email: nmcd10 at gmail.com
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