Does it get above 1200 deg F?
Wondering because I am choosing coating type.–
Joe Lystad
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In reply to a message from Joe Lystad sent Fri 17 Jun 2011:
Joe,
Never measured it to be honest.
Most manifolds I have ever seen over many years are usually the
base cast iron colour with a tinge of rust for looks mmmm… Even
the older Jags (my MK7m) which had coated manifolds (porcelein
coting??) did not last long either, and I believe it has to do with
expansion and contraction in that case.
Most manifold paints are rated at 650c from memory?, and dont last
long either. Proper preperation would obviously be paramount to the
life of any coating.
Airflow across manifolds would dictate heat rise, as would engine
load, coz HP = heat and so on and so on.
I would be asking some of the ‘‘show car’’ people what they use, as
most of them are usually coated with something??, at least from
photos etc I have seen from time to time.–
The original message included these comments:
Does it get above 1200 deg F?
Wondering because I am choosing coating type.
–
Grant Francis 85 XJSV12 (Hers), '96 X300 XJ6 3.2l (My Cat)
Adelaide South Austarlia, Australia
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In reply to a message from Grant Francis sent Sat 18 Jun 2011:
I had my exhaust manifolds coated back in 1995, they are still
perfect, shiny aluminum appearence, very clean look. reduced under
hood temps a lot, guessin 40-50%
it was a coating designed for Jet engine afterburner protection.
have no idea what it is, but it works! not like porcelain coating
that cracks and chips off.
sometimes called thermal barrier coating, but I found out there
are many types of coatings!
the young guy that did them is long gone onto other enterprises,
that happens when your young and creative.
I also had my cylinder heads(deck surface) coated along with the
exhaust ports, and valves, plus piston tops done with a special
heat resistance coating. they were done by Swain tech in NY state.
16yrs ago, no probs.
my reasons were the dreaded V12 overheat problems,more V12 went
down because of overheat than anything else.–
The original message included these comments:
base cast iron colour with a tinge of rust for looks mmmm… Even
the older Jags (my MK7m) which had coated manifolds (porceleinDoes it get above 1200 deg F?
Wondering because I am choosing coating type.
–
Ronbros
daytona fl. / Austin TX., United States
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In reply to a message from Ronbros sent Sat 18 Jun 2011:
Jet Hot and AirBorn are two that work very well. I have used
both on headers for racing. Believe it or not you can actually
touch the headers after a race not too long after the car is
shut down. Much sooner than if they are just painted.
After 3-4 seasons the coating still looked good and worked.
The stuff is not cheap but does work.–
Greg 1985 XJS HE DANA rear
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Grant Francis wrote:
Most manifolds I have ever seen over many years are usually the
base cast iron colour with a tinge of rust for looks mmmm…
Seriously, somebody needs to start making these things out of
stainless steel. Made of stainless, they wouldn’t need to be massive
castings, they could be much lighter weight tubing and would still
last forever.
– Kirbert
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In reply to a message from Kirbert sent Sun 19 Jun 2011:
Kirb there are at least 3 shops here in austin, that make anything
you want from stainless steel.
I have some nice pix BUT dont know how to post EASILY.
you in Orlando area I know there are at least 4 there, 2-3 in
daytona.
just gotta go down to Rican town!–
The original message included these comments:
Seriously, somebody needs to start making these things out of
stainless steel. Made of stainless, they wouldn’t need to be massive
castings, they could be much lighter weight tubing and would still
last forever.
–
Ronbros
daytona fl. / Austin TX., United States
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Ronbros wrote:
Kirb there are at least 3 shops here in austin, that make anything
you want from stainless steel.
OK, here’s the question: How much would it cost to just haul your
cast iron exhaust manifolds down there and say “Copy these in
stainless steel”, and how does that cost compare to Jet-Hot or
whatever other coating schemes are available?
Of course, Jet-Hot does more than make the manifolds look pretty, but
I’d bet for some owners it’s all about the pretty.
– Kirbert
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In reply to a message from Kirbert sent Sun 19 Jun 2011:
Kirbert
Isn’t there a noise penalty if you use fabricated as opposed
to cast exhaust manifolds? Or is that an old wives tale?
Greg–
The original message included these comments:
OK, here’s the question: How much would it cost to just haul your
cast iron exhaust manifolds down there and say ‘‘Copy these in
stainless steel’’, and how does that cost compare to Jet-Hot or
–
UK spec 1985 XJS V12 HE
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gregory wilkinson-riddle wrote:
Kirbert
Isn’t there a noise penalty if you use fabricated as opposed
to cast exhaust manifolds? Or is that an old wives tale?
I dunno about “penalty”. I’ll bet it affects the sound, but it might
be an improvement!
Whatever, I wasn’t talking about that at this point. I was talking
about having a casting shop cast exact copies of our cast iron
manifolds out of stainless steel – just so they’d be pretty rather
than rusty.
– Kirbert
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