[Healeys] Down Pipes - The Final Saga

[Harold Manifold]

Since we are using science and design of experiments I would like to add to
the research.
 
Test 1 - Brand new AH Spares (Bell) SS down pipe - 1" of flex with moderate
hand pressure.
Test 2 - Same as above for the other down pipe.
Test 3 - NOS BN1 mild steel down pipe never been installed. No rust. Minimum
20 years old - No flex solid as a rock.
 
BTW the NOS BN1 pipe is for sale. It would be suitable for a concourse
restoration.
 
Regards,
 
Harold

  _____  

From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Bob
Spidell
Sent: Thursday, October 24, 2019 7:28 AM
To: healeys at autox.team.net
Subject: Re: [Healeys] Down Pipes - The Final Saga


re: "... hen brand new do the mild steel down pipes ever show any sign of
flex?"

If you mean does the flexible section, well, flex?  Yes, they do; maybe an
inch or two of deflection at the end.

Bob


On 10/24/2019 6:52 AM, Neil McDonald wrote:


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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