[Healeys] Downpipes

[Michael Salter]

I'm at Conclave Bob and going from memory (which isn't what it used to be).
The downpipe I made is for a 100 and is the original diameter.
I  seem to recall that they were 2" for the 100 and 1.75 for the 6 cylinder
cars but could be wrong.

M


On Thu., Sep. 19, 2024, 11:02 a.m. Bob Spidell, <bspidell at comcast.net>
wrote:

> Thanks, Michael.
>
> Sounds like you have an 'oversized' exhaust; I think the original system
> is 1.75" (that's what AHS says theirs is). I'd hope a header would give a
> couple more HP.
>
> Bob
>
> On 9/19/2024 8:50 AM, Michael Salter wrote:
>
> 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.
>
> M
>
>
> On 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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