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Bob,
I restored a 1960 BT7 about seven years ago with no special treatment to the
exhaust system and it's never overheated here in Florida. That was a stainless
steel system so I don't worry about the rust.
By the way, I'm adding a Le Mans kit to my 100-4 and will have it in the 100M
registry.
Regards,
Charlie
----- Original Message -----
From: "Bob Spidell" <bspidell@comcast.net>
To: "Austin Healey" <healeys@autox.team.net>
Sent: Monday, September 14, 2020 10:47:54 AM
Subject: Re: [Healeys] [Healeys) 100-4 Heat Shield with Headers
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:
<blockquote>
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:
<blockquote>
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> 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
</blockquote>
</blockquote>
_______________________________________________
Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive
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http://autox.team.net/mailman/listinfo/healeys
------=_Part_269879_892675022.1600102492097
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<html><body><div style=3D"font-family: times new roman, new york, times, se=
rif; font-size: 12pt; color: #000000"><div>Bob,</div><div><br></div><div>I =
restored a 1960 BT7 about seven years ago with no special treatment to the =
exhaust system and it's never overheated here in Florida. That was a stainl=
ess steel system so I don't worry about the rust.</div><div><br></div><div>=
By the way, I'm adding a Le Mans kit to my 100-4 and will have it in the 10=
0M registry.</div><div><br></div><div>Regards,</div><div><br></div><div>Cha=
rlie</div><div><br></div><hr id=3D"zwchr"><div style=3D"color:#000;font-wei=
ght:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Ari=
al,sans-serif;font-size:12pt;" data-mce-style=3D"color: #000; font-weight: =
normal; font-style: normal; text-decoration: none; font-family: Helvetica,A=
rial,sans-serif; font-size: 12pt;"><b>From: </b>"Bob Spidell" <bspidell@=
comcast.net><br><b>To: </b>"Austin Healey" <healeys@autox.team.net>=
;<br><b>Sent: </b>Monday, September 14, 2020 10:47:54 AM<br><b>Subject: </b=
>Re: [Healeys] [Healeys) 100-4 Heat Shield with Headers<br><div><br></div>Y=
eah, I've heard that too (usually from the 'hot rod guys'). I wrapped my BJ=
8'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 th=
inking: Rust is, of course, oxidation. Water does not rust metal, it facili=
tates oxidation by providing a medium for electron transfer between the oxy=
gen 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 shut=
down). It cools and pools in the pipes and mufflers, which rust from the in=
side out. What's unclear to me is how wrap, or ceramic coating, which shoul=
d theoretically keep more heat in the system affects the steel. I would exp=
ect some embrittlement from the heat cycling, but haven't seen it (yet). <b=
r> <br> FWIW, I had my exhaust manifold ceramic coated (Jet Hot) and downpi=
pes wrapped, and didn't notice much, if any cooler running (I was disappoin=
ted). The side vents seem like they would help but, curiously, my BJ8 and B=
N2/100M behave exactly the same WRT engine temps. I expected the louvered b=
onnet to help prevent overheating, esp. at idle but ... nope.<br> <br> Bob<=
br> <br> <br><div class=3D"moz-cite-prefix">On 9/14/2020 7:56 AM, Michael O=
ritt wrote:<br></div><blockquote cite=3D"mid:CAPTa0B5Wa-h8JK1qqgs9OD6MPWZOF=
MCWQAW69dWUyfczcM8=3DLQ@mail.gmail.com"><div dir=3D"auto">Common wisdom ist=
hatexhaust wrapped to rusting out. it took 15 years to happen on my c=
ar and I am not convinced even now that the wrap promoted or hastened the p=
rocess.<div dir=3D"auto"><br></div><div dir=3D"auto">Best--Michael Oritt&nb=
sp;</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gma=
il_attr">On Mon, Sep 14, 2020, 10:16 AM Charles Schott via Healeys <<a h=
ref=3D"mailto:healeys@autox.team.net"; target=3D"_blank" data-mce-href=3D"ma=
ilto:healeys@autox.team.net">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" data-mce-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" data-mce-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 suspend=
ers 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 ve=
nts into the front wings which should help expel the heat. And I built a fa=
lse floor on the driver's side to provide an air space 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_5144250852966861=
597zwchr"><div style=3D"color:#000;font-weight:normal;font-style:normal;tex=
t-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt" da=
ta-mce-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"mailto:healeys@auto=
x.team.net" target=3D"_blank" rel=3D"noreferrer" data-mce-href=3D"mailto:he=
aleys@autox.team.net">healeys@autox.team.net</a>><br> <b>To: </b><a href=
=3D"mailto:healeys@autox.team.net"; target=3D"_blank" rel=3D"noreferrer" dat=
a-mce-href=3D"mailto:healeys@autox.team.net";>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" data-mc=
e-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></d=
iv></div><div id=3D"m_5144250852966861597ydpe32942ddyahoo_quoted_0886130810=
"><div style=3D"font-family:'Helvetica
Neue',Helvetica,Arial,sans-serif;font-size:13px;color=
:#26282a" data-mce-style=3D"font-family: 'Helvetica
Neue',Helvetica,Arial,sans-serif; font-size: 13px; co=
lor: #26282a;"><div>On Sunday, September 13, 2020, 3:38:08 PM PDT, Charles =
Schott via Healeys <a href=3D"mailto:healeys@autox.team.net"; target=3D"_bla=
nk" rel=3D"noreferrer" data-mce-href=3D"mailto:healeys@autox.team.net";><=
healeys@autox.team.net></a> wrote:</div><div><br></div><div><br></div><d=
iv><div id=3D"m_5144250852966861597ydpe32942ddyiv5409415901"><div><div styl=
e=3D"font-family:times new roman,new
york,times,serif;font-size:12pt;color:#000000" data-mce-style=3D"font-famil=
y: times new roman,new
york,times,serif; font-size: 12pt; color: #000000;"><div>After one more mod=
ification, the fifth one, to eliminate interference with the vacuum hose fi=
tting, I can continue with mounting the carbs. Some, including me, might sa=
y it's been over engineered.</div><div><br clear=3D"none"></div><div>Regard=
s,</div><div><br clear=3D"none"></div><div>Charlie</div><br></div></div></d=
iv></div></div></div></blockquote></div></div></div></blockquote></div></bl=
ockquote><br><br>_______________________________________________<br>Support=
Team.Net http://www.team.net/donate.html<br>Suggested annual donation &nbs=
p;$12.75<br><div><br></div>Archive: http://www.team.net/pipermail/healeys h=
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Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive
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