BMFC, Tiiming, and Coatings

[Shannen Durphey]

Well, in answer to the last question, ceramic thermal barrier coatings
stick in the combustion chamber.  They've been around for years, and
are starting to gain popularity.  Here's a company that makes DIY
coatings, which some list members have used succesfully.  
http://www.deskmedia.com/~techline/Index.html

I have thermal barrier coatings and dry film lubricant in an engine I
run daily, and have had mixed results.  DFL is available on piston
skirts through TRW, and GM is now applying it to pistons for the 3.1l
engine.

Shannen

Programmer wrote:
> 
> What about seat contact width ? Seat/valve contact location ? What kind of
> coating sticks to anything in the combustion area ?
> 
> Lyndon IPTECH
> -----Original Message-----
> From: Robert Harris <bob at bobthecomputerguy.com>
> To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
> Date: Sunday, May 16, 1999 9:47 AM
> Subject: BMFC, Tiiming, and Coatings
> 
> >Dave Vizard reports that simply coating the combustion face of the intake
> >valve lowers the intake air charge temperature by 60 degree F or more and
> is
> >worth typically two octane numbers increase in the effective octane of the
> >fuel.
> >
> >Remember that the intake valve face is exposed to combustion temperatures
> for
> >at least 50% of the cycle and reaches the same temperatures as the exhaust
> >face.  Further the back side temperature reaches 600+F in a normal engine.
> >The majority of the intake valve cooling comes from HEATING the intake air
> >charge.
> >
> >Insulating the valve from most of the combustion temperature significantly
> >reduces the intake valve temperature and reduces the amount of heat the
> valve
> >can reject to the incoming charge.
> >
> >The intake valve coating is so important that Vizard recommends that if you
> >only coat one thing, it should be the intake valve.
> >