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I'll add that, although I wrapped the mild steel downpipes on my BJ8 and have
no problems--that I know of--I've become reluctant to recommend it. I've seen
photographic evidence of pipes being severely eroded by wrapping; though it
appears to be a hit-or-miss issue, and may be due, in part, to how they were
wrapped and what they were wrapped with (I have to believe if it was a very
common problem nobody would buy the wrap and companies would cease to sell it).
I wouldn't expect ceramic coating to be a problem, at least if the pipes were
coated both inside and outside (inside only might even be better).
Here in the colonies we mostly have to use gas with 10% ethanol ('pure' gas is
available at some stations, but it's relatively rare). On a warm day, if my
engine is hot and shut down for less than a couple hours and restarted I'll get
some stumbling until air flow has cooled everything off a bit. I can't say with
absolute certainty that the gasahol is the problem, but I don't recall this
ever happening before the new formulation became prevalent. I think ceramic
coating the manifold might cure this problem.
Bob
----- Original Message -----
From: "Oudesluys" <coudesluijs@chello.nl>
To: "healeys" <healeys@autox.team.net>
Sent: Sunday, November 15, 2015 2:28:55 AM
Subject: Re: [Healeys] Jet-coating, wrap or do nothing to stainless headers?
Mirror polish them and leave them alone. Wrapping may lead to burning the metal
away, coating possibly a similar story. By polishing you reduce the radiation
of heat so the carbs should remain relatively cool. Anyway Webers/DellOrto's do
not have the tendency to boil fuel. Also a car with an electric fuel pump does
not normally have problems with fuel vapour lock.
Kees Oudesluijs
Op 15-11-2015 om 11:11 schreef Simon Lachlan:
I have stainless headers going down into a big bore(?) exhaust.
Opinions seem to vary as to the merits of wrapping, coating or doing nothing to
them .
I have Webers above them, but I suspect, in my ignorance, that these are maybe
less prone to evaporation issues than SUs.
What does the panel think?
See attached for a well researched synopsis. (Not by me!)
Simon
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<html><body><div style=3D"font-family: Arial; font-size: 12pt; color: #0000=
00"><div aria-label=3D"Compose body">I'll add that, although I wrapped the =
mild steel downpipes on my BJ8 and have no problems--that I know of--I've b=
ecome reluctant to recommend it. I've seen photographic evidence of p=
ipes being severely eroded by wrapping; though it appears to be a hit-or-mi=
ss issue, and may be due, in part, to how they were wrapped and what they w=
ere wrapped with (I have to believe if it was a very common problem nobody =
would buy the wrap and companies would cease to sell it). I wouldn't =
expect ceramic coating to be a problem, at least if the pipes were coated b=
oth inside and outside (inside only might even be better).<br></div><div ar=
ia-label=3D"Compose body"><br></div><div aria-label=3D"Compose body">Here i=
n the colonies we mostly have to use gas with 10% ethanol ('pure' gas is av=
ailable at some stations, but it's relatively rare). On a warm day, i=
f my engine is hot and shut down for less than a couple hours and restarted=
I'll get some stumbling until air flow has cooled everything off a bit.&nb=
sp; I can't say with absolute certainty that the gasahol is the problem, bu=
t I don't recall this ever happening before the new formulation became prev=
alent. I think ceramic coating the manifold might cure this problem.<=
br></div><div aria-label=3D"Compose body"><br></div><div aria-label=3D"Comp=
ose body">Bob<br></div><div><br></div><hr id=3D"zwchr"><div style=3D"color:=
#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:=
Helvetica,Arial,sans-serif;font-size:12pt;" data-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>"Oudesluys" &l=
t;coudesluijs@chello.nl><br><b>To: </b>"healeys" <healeys@autox.team.=
net><br><b>Sent: </b>Sunday, November 15, 2015 2:28:55 AM<br><b>Subject:=
</b>Re: [Healeys] Jet-coating, wrap or do nothing to stainless headers?<br=
><div><br></div><div class=3D"moz-cite-prefix">Mirror polish them and leave=
them alone. Wrapping may lead to burning the metal away, coating possibly =
a similar story. By polishing you reduce the radiation of heat so the carbs=
should remain relatively cool. Anyway Webers/DellOrto's do not have the te=
ndency to boil fuel. Also a car with an electric fuel pump does not normall=
y have problems with fuel vapour lock.<br> Kees Oudesluijs<br> <br> <br> <b=
r> <br> Op 15-11-2015 om 11:11 schreef Simon Lachlan:<br></div><blockquote =
cite=3D"mid:002d01d11f8d$f43ad080$dcb07180$@lachlan@homecall.co.uk"><div cl=
ass=3D"WordSection1"><p class=3D"MsoNormal">I have stainless headers going =
down into a big bore(?) exhaust.</p><p class=3D"MsoNormal">Opinions seem to=
vary as to the merits of wrapping, coating or doing nothing to them .</p><=
p class=3D"MsoNormal">I have Webers above them, but I suspect, in my ignora=
nce, that these are maybe less prone to evaporation issues than SUs.</p><p =
class=3D"MsoNormal">What does the panel think?</p><p class=3D"MsoNormal">Se=
e attached for a well researched synopsis. (Not by me!)</p><p class=3D"MsoN=
ormal">Simon</p></div><br><fieldset class=3D"mimeAttachmentHeader"></fields=
et>\<br></blockquote><div><br></div></div><div><br></div></div></body></htm=
l>
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