[DeTomaso] Exhaust coating questions?

[Charles Engles]

Dear Steve,


         I had a new set of PPC GTS headers and exhaust coated by a local
company HPC, High Performance Coatings in 1991.   They were coated inside
and out with aluminized ceramic coating.  It lasted about twenty years.  The
engine bay temps did noticeably drop.   They did dull the original shiny
appearance, but I never did any bling maintenance on them.  About twenty
years later while doing an engine rebuild I noticed a couple of spots where
the coating had failed.  HPC begrudgingly honored there original "lifetime"
coating guarantee.  Beautiful shiny headers once again dulled a bit with use
in short order.

        The other Pantera had nasty ol' pre owned, seasoned headers and
exhaust treated by a different company, Performance Coatings in 2000.
Included in their price was sandblasting and inside and outside coating with
aluminized ceramic.  Their product looked just as shiny as HPC and suffered
the same dulling of the shine, but performs the same. 

        In my inspection of both jobs, the inside of the headers appeared to
be well coated. 

        I would not recommend powder coating the headers.

        Neither coating chipped.  The GTS set ultimately chipped where my
1991 mechanic used a BFH for a little clearance with the engine mounts.
After twenty years there was a small spontaneous failure and chipping on the
other bank of the headers.  No flaking or failure near the maximum heat at
the exhaust ports.


       Nationally, I understand that Jet Hot does a good job.


                 Warmest regards,  Chuck Engles



-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of steven.liebenow at att.net
Sent: Tuesday, July 13, 2010 1:30 PM
To: mailing list detomaso
Subject: [DeTomaso] Exhaust coating questions?

Options.....

Jet Hot

Ceramic coating

Powder coating  (same as ceramic?)

Issues:  do the vendors blast and coat the inside and out of the headers?

Do the headers need to be virgin steel or can you give them your old nasty 
headers.....?  OK, not that nasty.....slightly nasty....

I have one set that was treated back in the 70s-80's with that rough
aluminum 
coating crap  (electrostatic spray??) that Hall used on his
headers......touch 
them with a greasy finger and they stay dirty forever....    This stuff
would 
need to be removed.....

Pluses and minuses anyone?????

What holds up, what doesn't?

Chipping/peeling?

Discoloration?

Yes I tried the search..... :)
Thanks!
Steve

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