[Healeys] Down Pipes - The Final Saga

[WILLIAM B LAWRENCE]

Thanks for the info Perry. So it would seem that the best setup would be a mild steel system from the muffler back for the sound and stainless downpipes for the flex.

Bill Lawrence
BN1 #554
________________________________
From: Healeys <healeys-bounces at autox.team.net> on behalf of Perry via Healeys <healeys at autox.team.net>
Sent: Thursday, October 24, 2019 1:42 PM
To: healeys <healeys at autox.team.net>
Subject: [Healeys] Down Pipes - The Final Saga


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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