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I have had exactly the same results as Bob, as in "no noticeable change in
temperature" despite those mods.
M
On Mon., Sep. 14, 2020, 12:21 p.m. Bob Spidell, <bspidell@comcast.net>
wrote:
> Yeah, I've heard that too (usually from the 'hot rod guys'). I wrapped my
> BJ8's downpipes about 8yrs/40K or so miles ago, and when I rebuilt the
> engine 3 years ago I checked them; no evidence of any degradation.
>
> My thinking: Rust is, of course, oxidation. Water does not rust metal, it
> facilitates oxidation by providing a medium for electron transfer between
> the oxygen in the air and the iron in steel. Manifolds, downpipes and
> headers get hot enough that the water in the exhaust gasses stays vaporized
> (until shutdown). It cools and pools in the pipes and mufflers, which rust
> from the inside out. What's unclear to me is how wrap, or ceramic coating,
> which should theoretically keep more heat in the system affects the steel.
> I would expect some embrittlement from the heat cycling, but haven't seen
> it (yet).
>
> FWIW, I had my exhaust manifold ceramic coated (Jet Hot) and downpipes
> wrapped, and didn't notice much, if any cooler running (I was
> disappointed). The side vents seem like they would help but, curiously, my
> BJ8 and BN2/100M behave exactly the same WRT engine temps. I expected the
> louvered bonnet to help prevent overheating, esp. at idle but ... nope.
>
> Bob
>
>
> On 9/14/2020 7:56 AM, Michael Oritt wrote:
>
> Common wisdom isthatexhaust wrapped to rusting out. it took 15 years to
> happen on my car and I am not convinced even now that the wrap promoted or
> hastened the process.
>
> Best--Michael Oritt
>
> On Mon, Sep 14, 2020, 10:16 AM Charles Schott via Healeys <
> healeys@autox.team.net> wrote:
>
>> Bob,
>>
>> I did wrap the headers but I'm a belt and suspenders type of guy. Never
>> intended it to be that much work, but once I started, I wasn't going to
>> quit on it. I'm also going to install the triangular vents into the front
>> wings which should help expel the heat. And I built a false floor on the
>> driver's side to provide an air space that will act as an insulator. It
>> gets hot in Florida.
>>
>> Regards,
>>
>> Charlie
>>
>> ------------------------------
>> *From: *"Bob Spidell via Healeys" <healeys@autox.team.net>
>> *To: *healeys@autox.team.net
>> *Sent: *Sunday, September 13, 2020 11:31:10 PM
>> *Subject: *Re: [Healeys] [Healeys) 100-4 Heat Shield with Headers
>>
>> Well done, but I gotta ask, why not just wrap the headers?
>>
>>
>> On 9/13/2020 8:42 PM, Ray Juncal via Healeys wrote:
>>
>> Wow, you had fun making that. Nice work.
>>
>> On Sunday, September 13, 2020, 3:38:08 PM PDT, Charles Schott via Healeys
>> <healeys@autox.team.net> <healeys@autox.team.net> wrote:
>>
>>
>> After one more modification, the fifth one, to eliminate interference
>> with the vacuum hose fitting, I can continue with mounting the carbs. Some,
>> including me, might say it's been over engineered.
>>
>> Regards,
>>
>> Charlie
>>
>>
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Content-Transfer-Encoding: quoted-printable
<div dir=3D"auto">I have had exactly the same results as Bob, as in "n=
o noticeable change in temperature" despite those mods.<div dir=3D"aut=
o"><br></div><div dir=3D"auto">M</div></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Mon., Sep. 14, 2020, 12:21 p.m. Bo=
b Spidell, <<a href=3D"mailto:bspidell@comcast.net";>bspidell@comcast.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">
=20
=20
=20
<div>
Yeah, I've heard that too (usually from the 'hot rod guys')=
. I
wrapped my BJ8's downpipes about 8yrs/40K or so miles ago, and when
I rebuilt the engine 3 years ago I checked them; no evidence of any
degradation.<br>
<br>
My thinking: Rust is, of course, oxidation. Water does not rust
metal, it facilitates oxidation by providing a medium for electron
transfer between the oxygen in the air and the iron in steel.
Manifolds, downpipes and headers get hot enough that the water in
the exhaust gasses stays vaporized (until shutdown). It cools and
pools in the pipes and mufflers, which rust from the inside out.
What's unclear to me is how wrap, or ceramic coating, which should
theoretically keep more heat in the system affects the steel. I
would expect some embrittlement from the heat cycling, but haven't
seen it (yet). <br>
<br>
FWIW, I had my exhaust manifold ceramic coated (Jet Hot) and
downpipes wrapped, and didn't notice much, if any cooler running (I
was disappointed). The side vents seem like they would help but,
curiously, my BJ8 and BN2/100M behave exactly the same WRT engine
temps. I expected the louvered bonnet to help prevent overheating,
esp. at idle but ... nope.<br>
<br>
Bob<br>
<br>
<br>
<div>On 9/14/2020 7:56 AM, Michael Oritt
wrote:<br>
</div>
<blockquote type=3D"cite">
=20
<div dir=3D"auto">Common wisdom isthatexhaust wrapped to rusting
out.=C2=A0 it took 15 years to happen on my car and I am not
convinced even now that the wrap promoted or hastened the
process.
<div dir=3D"auto"><br>
</div>
<div dir=3D"auto">Best--Michael Oritt=C2=A0</div>
</div>
<br>
<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Mon, Sep 14, 2020, 10:16 A=
M
Charles Schott via Healeys <<a href=3D"mailto:healeys@autox.te=
am.net" target=3D"_blank" rel=3D"noreferrer">healeys@autox.team.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">
<div>
<div style=3D"font-family:times new roman,new york,times,serif;=
font-size:12pt;color:#000000">
<div>Bob,</div>
<div><br>
</div>
<div>I did wrap the headers but I'm a belt and suspenders
type of guy. Never intended it to be that much work, but
once I started, I wasn't going to quit on it. I'm a=
lso
going to install the triangular vents into the front
wings which should help expel the heat. And I built a
false floor on the driver's side to provide an air spac=
e
that will act as an insulator. It gets hot in Florida.</div=
>
<div><br>
</div>
<div>Regards,</div>
<div><br>
</div>
<div>Charlie</div>
<div><br>
</div>
<hr id=3D"m_-1626287184057819499m_5144250852966861597zwchr">
<div style=3D"color:#000;font-weight:normal;font-style:normal=
;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt=
"><b>From:
</b>"Bob Spidell via Healeys" <<a href=3D"mail=
to:healeys@autox.team.net" rel=3D"noreferrer noreferrer" target=3D"_blank">=
healeys@autox.team.net</a>><br>
<b>To: </b><a href=3D"mailto:healeys@autox.team.net"; rel=3D=
"noreferrer noreferrer" target=3D"_blank">healeys@autox.team.net</a><br>
<b>Sent: </b>Sunday, September 13, 2020 11:31:10 PM<br>
<b>Subject: </b>Re: [Healeys] [Healeys) 100-4 Heat
Shield with Headers<br>
<div><br>
</div>
Well done, but I gotta ask, why not just wrap the
headers?<br>
<br>
<br>
<div>On 9/13/2020 8:42 PM, Ray Juncal via Healeys wrote:<br=
>
</div>
<blockquote>
<div style=3D"font-family:Helvetica Neue,Helvetica,Arial,=
sans-serif;font-size:16px">
<div dir=3D"ltr">Wow, you had fun making that. Nice
work.<br>
</div>
<div><br>
</div>
</div>
<div id=3D"m_-1626287184057819499m_5144250852966861597ydp=
e32942ddyahoo_quoted_0886130810">
<div>
<div> On Sunday, September 13, 2020, 3:38:08 PM
PDT, Charles Schott via Healeys <a href=3D"mailto:h=
ealeys@autox.team.net" rel=3D"noreferrer noreferrer" target=3D"_blank"><=
healeys@autox.team.net></a>
wrote: </div>
<div><br>
</div>
<div><br>
</div>
<div>
<div id=3D"m_-1626287184057819499m_5144250852966861=
597ydpe32942ddyiv5409415901">
<div>
<div style=3D"font-family:times new roman,new y=
ork,times,serif;font-size:12pt;color:#000000">
<div>After one more modification, the
fifth one, to eliminate interference
with the vacuum hose fitting, I can
continue with mounting the carbs. Some,
including me, might say it's been over
engineered.</div>
<div><br clear=3D"none">
</div>
<div>Regards,</div>
<div><br clear=3D"none">
</div>
<div>Charlie</div>
<br>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
</blockquote>
<br>
</div>
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