BMFC, Tiiming, and Coatings

[Programmer]

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.
>