[Healeys] Down Pipes - The Final Saga

[Michael Oritt]

I'll second that:  I have DW exhaust headers with no flex pipe in the
system and exhaust wrap that has been on for 23 years with no problems.

Best--Michael Oritt

On Fri, Oct 25, 2019, 8:36 AM Chris Dimmock <austin.healey at gmail.com> wrote:

> I have always had extractor (header) type manifolds fitted to my Healeys
> since 1986.
> My BN1, and my BJ8 - No flex pipe - all solid pipe - just like my previous
> Sprites.
> The extractor exhaust on my Healey 3000 - which has been wrapped since
> 1995 - has just recently celebrated its 24th anniversary on the Black and
> White car.
> So no flex joint pipe. Mild steel - wrapped - and I'm now on my second
> muffler with my side exit exhaust.
> Ok - the first one had some repairs - but all the damage and wear was road
> clearance related.
> Ignore the flex pipe. I've never had one ever in 35 years!
> Ignore the doomsayers who will tell you your mild steel exhaust will burn
> up with exhaust  wrap. It won't. Mine didn't.
> My extractors are still fine. And I'm on my second muffler - and my ground
> clearance is probably less than yours!
> The only enemy is ashphalt!!
> Best
> Chris
> www.myaustinhealey.com
>
>
>
> On 25 Oct 2019, at 12:52 am, Neil McDonald <nmcd10 at gmail.com> 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
>>
>>
>>
>> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for
>> Windows 10
>>
>>
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>> --
> ____________________
> Neil & Pam McDonald
>
> Email: nmcd10 at gmail.com
>
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