Many of you may already know this,but we found out about it in designing and
building a new
header for the CRX.Stainless steel conducts much less heat than mild steel not
to mention
it's other good properties.According to Burns Stainless(www.burnsstainless.com)
1010 mild
steel conducts 219% more heat per foot than 321 stainless. That would seem to
minimize the
need for wraps and coatings.Another good thing for you turbo guys is that
stainless doesn't
"scale"-so particles don't get into the turbine blades.Anyway something to
think about.
Tim Schoeny
ECTA#90/SCTA#905
Finishline Coatings wrote:
> Hi Dan:
> Good to hear from you. Want to thank you again for your enthusiasm and
>generous
> compliments about our car when you certified it at Bonneville and Muroc.
> About your header coatings...All of the silver header coatings-no matter
>which company
> does them, Jet Hot, HPC, Poly dyne, Swain or us- Finishline Coatings- will go
>away at
> about 1250 degrees. Our ceramic metallic coating is certified by NASA for
>turbine jet
> engines just like HPC. etc.
> First the coating will dull out. At 1400-1450 degrees it will start to break
>up and come
> off. That's because the ceramic has so much aluminum powder in it that the
>extreme heat
> is causing the aluminum to deteriorate.
> We have developed an under base for this problem, but it is only good for
>another couple
> 100 degrees. It will keep the coating from actually coming off, but will
>still gray out.
> One of the things that we try to do is educate our customers about the best
>coatings for
> their particular application. We are far from being the biggest company, but
>we do want
> to do the best quality of work period!!
> For your application, we recommend our Black Satin finish.. It is the highest
>thermal
> barrier of any coatings available. and we have tested it at over 2200 degrees
>without
> failure. Remember that alcohol motors generally don't run as hot of exhaust
>temp. as gas
> motors. Turbo charged motors build tremendous heat in the exhaust system
>under a load.
> The one thing about the silver coatings is that it is a very good rust
>inhibitor, so in
> applications where the exhaust temp do not exceed the 1300 degree range, it
>is a good
> coating to use on Land Speed cars. We put a special base coat under our
>Black Satin
> coating and have found it to be a good rust resistant coating also.
> Thanks for your inquiry, Dan. Hope to see you this June in Muroc.
>
> Russ Meeks
> Finishline Coatings
>
> Dan Warner wrote:
>
> > Russ,
> >
> > I have a question you maybe able to answer. We had our headers coated by HPC
> > this year(had a gift certificate for $100). The first time we started the
> > Alfa the coating burned off at the bends and tips of the collectors. EGTs
> > are approx. 1450 - pipes are 16 to 18" long if I remember right.
> >
> > Thanks,
> >
> > Dan Warner
> > ----- Original Message -----
> > From: Finishline Coatings <lona@finishlinecoatings.com>
> > To: John Beckett <landspeedracer@email.msn.com>
> > Cc: <dferguso@ebmail.gdeb.com>; <bbutters@dmi.net>;
> > <land-speed@autox.team.net>
> > Sent: Tuesday, January 04, 2000 12:22 PM
> > Subject: Re: Exhaust exits
> >
> > > John:
> > > Did you know that the "ceramic coating" that is applied to exhaust
> > pipes-if
> > > applied to the inside tubing also-not only acts as a heat barrier, but is
> > > known to increase scavenging of exhaust gasses.Wes Potter was mentioning
> > HPC
> > > coating for a turbo and heating problem the other day- and our company,
> > > Finishline Coating, does the same process. Just letting everyone
> > know...I'll
> > > shut up now.
> > > Thanks,
> > > Russ Meeks
> > >
> > >
> > >
> > >
> > > John Beckett wrote:
> > >
> > > > Wonder if you could actually design something that could create a strong
> > > > scavenge, low pressure, effect to help pull the exhaust out? If pumping
> > > > efforts were reduced maybe one could overcome, or surpass, the increase
> > in
> > > > frontal area. Would the scavenging increase the efficiency of the
> > > > turbocharger as it would in a normally aspirated engine?
> > > >
> > > > John Beckett
> > > > -----Original Message-----
> > > > From: dferguso@ebmail.gdeb.com <dferguso@ebmail.gdeb.com>
> > > > To: bbutters@dmi.net <bbutters@dmi.net>; land-speed@autox.team.net
> > > > <land-speed@autox.team.net>
> > > > Date: Tuesday, January 04, 2000 9:56 AM
> > > > Subject: RE: Exhaust exits
> > > >
> > > > >on the up side, depending on the angle, shape, and size of the exhaust
> > > > >dumps, and the speed of the car, some positive venturi effect of
> > lowering
> > > > >exhaust pressure may be realized
> > > > >
> > > > >doug @ black radon engineering
> > > > >
> > > > >
> > >
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