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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@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@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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>>
>>
>
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Content-Transfer-Encoding: quoted-printable
<div dir=3D"auto">I'm at Conclave Bob and going from memory (which isn&=
#39;t what it used to be).=C2=A0<div dir=3D"auto">The downpipe I made is fo=
r a 100 and is the original diameter.=C2=A0</div><div dir=3D"auto">I=C2=A0 =
seem to recall that they were 2" for the 100 and 1.75 for the 6 cylind=
er cars but could be wrong.=C2=A0</div><div dir=3D"auto"><br></div><div dir=
=3D"auto">M</div><div dir=3D"auto"><br></div></div><br><div class=3D"gmail_=
quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu., Sep. 19, 2024, 11:02 =
a.m. Bob Spidell, <<a href=3D"mailto:bspidell@comcast.net";>bspidell@comc=
ast.net</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"=
margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
=20
=20
=20
<div>
Thanks, Michael.<br>
<br>
Sounds like you have an 'oversized' exhaust; I think the origin=
al
system is 1.75" (that's what AHS says theirs is). I'd hope=
a header
would give a couple more HP.<br>
<br>
Bob<br>
<br>
<div>On 9/19/2024 8:50 AM, Michael Salter
wrote:<br>
</div>
<blockquote type=3D"cite">
=20
<div dir=3D"auto">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=C2=A0
stainless=C2=A0steel. The whole process was a little expensive but
this has been on my BN1 for 10 years and many thousands of
miles.=C2=A0
<div dir=3D"auto">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.</div>
<div dir=3D"auto">I'm not a brilliant welder but I certainly
managed to produce a very satisfactory weld.=C2=A0</div>
<div dir=3D"auto"><br>
</div>
<div dir=3D"auto">M</div>
<div dir=3D"auto"><br>
</div>
</div>
<br>
<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Wed., Sep. 18, 2024, 10:36
p.m. Bob Spidell via Healeys, <<a href=3D"mailto:healeys@autox=
.team.net" target=3D"_blank" rel=3D"noreferrer">healeys@autox.team.net</a>&=
gt;
wrote:<br>
</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border=
-left:1px #ccc solid;padding-left:1ex">Listers,<br>
<br>
The exhaust downpipes for both 4- and 6-cyl cars have a
section of <br>
flexible tubing before the connection to the muffler. I've
always <br>
assumed this was to allow for the rocking of the engine, and
the fact <br>
the system is affixed with fairly rigid hangers (at least,
until the <br>
rubber part disintegrates). I've also heard the flexpipe is t=
o
allow <br>
easier fitment from the downpipe to the muffler, which won't
necessarily <br>
be perfectly aligned. Of course, both reasons could be true.<br>
<br>
I'm asking the knowledge-based, LLM model List because I'=
m
considering <br>
an aftermarket header from AH Spares for my BN2/100M. The
repop down <br>
pipe I have now is malformed, and the clutch pedal arm comes
in contact <br>
with it at full clutch pedal, and I've heard this is common i=
n
the <br>
repops (yes, I could just bash the downpipe, but that would be
tacky and <br>
sometimes that can cause a ticking noise, which would annoy me
even <br>
more). But, the AHS pipe doesn't have the section of flexpipe
so I'm <br>
wondering if it's really needed. I have a TIG and I'm not
terrible with <br>
it, but the header and, presumably the flex tubing are SS,
which I'm not <br>
practiced in welding.<br>
<br>
Thanks for any suggestions.<br>
<br>
Bob<br>
_______________________________________________<br>
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alter@gmail.com</a><br>
<br>
</blockquote>
</div>
</blockquote>
<br>
</div>
</blockquote></div>
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