[s-cars] To ceramic coat or not

Fri Jan 6 16:28:53 EST 2006

My car, at steady state cruising (85-90mph) the EGTs stay at about 1125F.  A hard and prolonged acceleration run will result in EGTs in the 1400+ range.

>From my experience, I don't think you're going to find any coating that will withstand the temps and gas flow found on the inside of a header.  It might hold up inside a DP, and even if it doesn't, it can't damage the turbo... but could clog the cat.

I'm not sure what people's goals are here... bling or function.  If your goals are functional (meaning more power), you're wasting your $ coating the DP... and probably gaining a minimally measurable amount messing with the header.

If your concern is radiant heat damage (this was my concern) to parts in the engine compartment, coating the header does a pretty good job.  Your best bet with the DP would be a wrap material.

Dave

-----Original Message-----
From: Brian DeWyngaert Jr <brian.dewyngaert.jr at gmail.com>
To: s-car-list at audifans.com
Sent: Fri, 6 Jan 2006 15:49:45 -0500
Subject: Re: [s-cars] To ceramic coat or not

Hey Guys,
  I just gave Jet-HOT a call, to see what a downpipe coating would
cost, if they would do inside and out and what product they suggested.
 I was advised that with a turbo application they strongly suggest
that the inside not be coated.  They could not guaruntee that the
applied material would not flake off and damage the turbo.
As far as suggested product for best insulation they sugested a white
cream Z coating.  This coating is applied at 2mils.  The price was 35$
per foot, so roughly 140$ total for a downpipe the process would take
about 7 days to complete.

I was also advised to stay away from the sterling coating in parts
that would handle exhaust gases, as the high temperatures from a turbo
could damage the coating.
Has any body done any pyro testing on the various engine, exhaust
parts, to see after some seriously hard runs what the temperatures are
at?  I think it would be kinda nifty, a little ricy, but still nifty
to some items in the engine bay in a sterling like finish. Thoughts?

Cheers,
Brian
94 S4 NoVa
On 1/6/06, Mark Strangways <Strangconst at rogers.com> wrote:
> I can understand where you want turbulence or anti-reversion tactics at /
> near the cylinder head, but I wonder what can be gained from sticky surfaces
> in the exhaust system past the point where anti-reversion makes a positive
> effect.
>
> I may be wrong, but that's how I would expect things to work
> ----- Original Message -----
> From: <manuelsanchez at starpower.net>
> To: <djdawson2 at aol.com>
> Cc: <s-car-list at audifans.com>
> Sent: Friday, January 06, 2006 1:01 PM
> Subject: Re: [s-cars] To ceramic coat or not
>
>
> > Dave,
> >
> > thanks. that's what I love about the list, often makes me
> > think counter to what I had originally thought. The turbulence
> > helping flow as opposed to hindering is a case in point. Seems
> > to make sense when I think about it in terms of what I had
> > heard about porting heads.
> >
> > Thanks again for the info on your own ceramic coating
> > experience, it reinforces an opinion I'm forming. I bought a
> > ceramic coated header for my truck (got tired of the warping
> > EM and broken studs so I thought what the hell). It came
> > coated from the vendor, and I'm not sure who did the coating,
> > but after a few months large sections on the cross over pipe
> > flaked off.  I'm glad (but really sorry) it wasn't just me.
> >
> > -manny
> >
> > ---- Original message ----
> >>Date: Fri, 06 Jan 2006 11:13:13 -0500
> >>From: djdawson2 at aol.com
> >>Subject: Re: [s-cars] To ceramic coat or not
> >>To: manuelsanchez at starpower.net, s-car-list at audifans.com
> >>
> >>   I'll give you my 2 cents worth.
> >>
> >>   I had my header Swain coated 1 year and 2 months
> >>   ago...and 36k miles ago... and only on the
> >>   exterior.  It has held up fairly well, but
> >>   significant sections have become bare.  With that
> >>   alone in mind, I wouldn't consider coating the
> >>   inside of a header or downpipe I owned.  If it
> >>   doesn't last on the outside, it can't have a prayer
> >>   on the inside.
> >>
> >>   As far as flow is concerned... there exists a good
> >>   arguement in support of "surface turbulence"
> >>   improving flow rather than hindering it.  However,
> >>   if the DP is 3" (or more), I doubt you could ever
> >>   tell the difference in power output.
> >>
> >>   Dave
> >>
> >>   -----Original Message-----
> >>   From: manuelsanchez at starpower.net
> >>   To: s-car-list at audifans.com
> >>   Sent: Fri, 6 Jan 2006 08:22:04 -0500
> >>   Subject: [s-cars] To ceramic coat or not
> >>
> >> S-heads,
> >>
> >> Thanks for the input so far.
> >>
> >> I thought I had recently seem some opinions about coating the
> >> inside of components;
> >>
> >> 1. There was a concern that as the ceramic coating flaked off
> >> or deteriorated, that the bits would lodge in downstream
> >> components, such as the kitties.  Do these coatings
> >> deteriorate quickly, slowly?  How do they deteriorate? Is this
> >> a valid concern?
> >>
> >> 2. Interior coating is not "smooth" as the uncoated metal,
> >> presumably this would disturb the flow.  Do the benefits of
> >> keeping the heat from the metal outweigh the diturbed gas-flow?
> >>
> >> Look forward to your input.
> >>
> >> -manny
> >> 95.5 UrS6 Avant
> >> _______________________________________________
> >> S-CAR-List mailing list
> >> S-CAR-List at audifans.com
> >> http://www.audifans.com/mailman/listinfo/s-car-list
> > _______________________________________________
> > S-CAR-List mailing list
> > S-CAR-List at audifans.com
> > http://www.audifans.com/mailman/listinfo/s-car-list
> >
>
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list
>
_______________________________________________
S-CAR-List mailing list
S-CAR-List at audifans.com
http://www.audifans.com/mailman/listinfo/s-car-list