[Diy_efi] Thermal barrier coatings

[John Stricker]

Greg,

Weigh in on something for me, if you would.

I've heard from several places that Teflon is not the way to go.  Teflon
repels oil (along with everything else) and it's so slippery that the oil
will not stay on it.  Moly disulfide is the second most popular coating, and
it retains oil.  Now all of this is from people trying to sell me something,
of course, and the Teflon advocate folks are quick to point out that if
Teflon is THAT slippery what do you care if it sheds the oil?  A good
question.  But then again, if Teflon works that well, why not coat
everything with it and not run any oil at all??

I think you get where I'm going here.  I've decided to do the moly disulfide
route and we'll see how that goes.  I chose that after talking to the guys
at Swain, who have a lot of experience with coatings over a lot of years
and, in fact, even used to offer Teflon coatings themselves.

I've tried some of the DIY coatings with highly variable results.  Sometimes
very good, sometimes not good at all.  The problem is that there was no way
to tell ahead of time what the results were going to be, and I really don't
want to find out after it's blowing pieces of the coating out the exhaust
ports.  I'll leave the coating to the pros for now, at least on internal
components.

John Stricker
----- Original Message -----
From: "Greg Hermann" <bearbvd at mindspring.com>
To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
Sent: Tuesday, January 21, 2003 8:10 AM
Subject: Re: [Diy_efi] Thermal barrier coatings


> At 3:52 AM 1/21/03, Ohio Benz wrote:
>
> Among the more interesting coatings I have come acrross are from Ni-Met
> Industries (Gary, Ind.)
>
> They do a teflon impregnated anodizing (RC 70 surface hardness and _VERY_
> slippery) which is neat for pistons (skirts, pin bores and ring grooves).
>
> Also, a teflon impregnated carbide coating (also very hard and slick) for
> brass/bronze/copper alloys which might be pretty interesting for the ID of
> valve guides and possibly also for con rod small end bushings.
>
> Greg
>
> >Tech Line Coatings sells a full range of ceramic, dry
> >film lube and other coatings for temp barrier
> >applications.
> >I have applied the ceramic to piston tops and would
> >recommend that you also do the combustion chambers and
> >valve heads. BTW I applied this to forged pistons.
> >The application seems simple enough, but proper
> >cleaning, grit blasting and access to an industrial
> >oven for 600F baking is required.  It took me several
> >tries to get a thick enough coating as recommended
> >without it flaking after high temp curing,
> >They have header, brake caliper and a variety of other
> >coatings capable of withstanding very high temps.
> >If anyone would like a pic of a finished piston or
> >combustion chamber contact me offline.
> >
> >=====
> >Jerrit Ekama
> >
> >OHB Tuning
> >Custom fabrication of performance parts for your Mercedes, VW, BMW, Audi.
> >U.S. domestic and foreign vehicle repair and maintenance.
> >Powder coating, Anodizing, TIG welding, CNC machining services.
> >IM: OHBenz
> >
> >__________________________________________________
> >Do you Yahoo!?
> >Yahoo! Mail Plus - Powerful. Affordable. Sign up now.
> >http://mailplus.yahoo.com
> >
> >_______________________________________________
> >Diy_efi mailing list
> >Diy_efi at diy-efi.org
> >http://www.diy-efi.org/mailman/listinfo/diy_efi
>
>
>
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> http://www.diy-efi.org/mailman/listinfo/diy_efi


_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://www.diy-efi.org/mailman/listinfo/diy_efi