[Healeys] Downpipes

[s.hutchings]

My comment on this is that I've gone through 3 sets of flex pipe (AH spares) that all leaked like a sieve.  I too thought that the flex pipe allowed for some movement between the engine and transmission, but I talked to the Rawles people when I was at Goodwood about this, and they have a system without flex pipe, and claim they have no problem with it. Good for them.For me, in the end I found a solution to fix the flex pipe, but it was a lot of work!I'd recommend you pressure test the components before installing anything.Stephen,  BJ8Sent from my Galaxy
-------- Original message --------From: Michael Salter <michaelsalter at gmail.com> Date: 2024-09-19  4:56 PM  (GMT+00:00) To: Bob Spidell <bspidell at comcast.net> Cc: Healeys <healeys at autox.team.net> Subject: Re: [Healeys] Downpipes Hi Bob, after searching in vain for a company in NA I finally found a company in Christchurch New Zealand who were able to bend some 2" exhaust tube to exactly the correct shape based on the original drawings of which I have a copy. To that pipe I TIG welded a new flange, which I had flame cut, and a section of flex pipe of the correct type but made from  stainless steel. The whole process was a little expensive but this has been on my BN1 for 10 years and many thousands of miles. I had the need to remove it this summer and the flex is as flexible as it was when installed and serving its purpose admirably and the mild steel tubing has still got some of the high temperature paint on it.I'm not a brilliant welder but I certainly managed to produce a very satisfactory weld. MOn Wed., Sep. 18, 2024, 10:36 p.m. Bob Spidell via Healeys, <healeys at autox.team.net> wrote:Listers,

The exhaust downpipes for both 4- and 6-cyl cars have a section of 
flexible tubing before the connection to the muffler. I've always 
assumed this was to allow for the rocking of the engine, and the fact 
the system is affixed with fairly rigid hangers (at least, until the 
rubber part disintegrates). I've also heard the flexpipe is to allow 
easier fitment from the downpipe to the muffler, which won't necessarily 
be perfectly aligned. Of course, both reasons could be true.

I'm asking the knowledge-based, LLM model List because I'm considering 
an aftermarket header from AH Spares for my BN2/100M. The repop down 
pipe I have now is malformed, and the clutch pedal arm comes in contact 
with it at full clutch pedal, and I've heard this is common in the 
repops (yes, I could just bash the downpipe, but that would be tacky and 
sometimes that can cause a ticking noise, which would annoy me even 
more). But, the AHS pipe doesn't have the section of flexpipe so I'm 
wondering if it's really needed. I have a TIG and I'm not terrible with 
it, but the header and, presumably the flex tubing are SS, which I'm not 
practiced in welding.

Thanks for any suggestions.

Bob
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