BMFC, Tiiming, and Coatings

[Greg Hermann]

>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.

Thanks Bob! Now mebbe Gary will worry about it being to cool to evaporate
the fuel sprayed on the back side of it! Good post!

Greg