Ceramic coating, intake manifolds

[Alan Pritchard]

Well, I guess the goal is to lower intake charge temperature/prevent it from
picking heat up.
I guess if your im picked up heat form the head/engine bay then it would be
nice to insulate the intake charge from that heat...... conversely.... If
your im got chilled from some nice airflow over it, it would be unwise to
insulate it. Of course, then you have the issue of fuel atomisation which
has collected in the manifold, a warm manifold would help that. And I
remember a while back a discussion about tufnol spacers to insulate the
manifold from the heat.  So I guess it is really down to a specific
installation. IMHO it would be better to insulate the exhaust manifold, to
keep exhaust gas speed up, and to lower under bonnet temperatures, I think
that's where I would put my money first on any ceramic coating....
 -----Original Message-----
From: 	Richard Hoffman [mailto:billzcat1 at hotmail.com] 
Sent:	28 November 2003 08:55
To:	quattro at audifans.com
Subject:	Ceramic coating, intake manifolds

Hello All!
I don't have a terribly important question...but I was always under the
impression that ceramic coating an intake manifold helped lower intake air
temperatures by reflecting radiant heat in the engine bay.

Just recently (on an internet chat board, told you it wasn't that important)
I was told that the intake manifold is supposed to act as a heat sink and
absorb heat from the intake air.  This sounds totally backwards from
everything I've ever heard.  We're not talking some crazy intercooler/intake
manifold combo, or even a forced induction application.  Just a regular old
cross-flow 4v motor (use a 7A as an example).

Just looking for confirmation that the person who told me that is a dolt.
Feel free to doltify me, if appropriate!

Richard
90 CQ
70 100LS
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