What is a manifold heat control valve?
The simple device of manifold heat control valve is essential for smooth engine operation, even in warm summer
weather. The reason is simple physics; converting a liquid (gasoline) into a
vapor (air/fuel mixture) requires the application of heat. Start your car on a
cool day and watch the base of the carburetor; it will become frost-covered
for a short period of time as the engine warms to operating temperature. The
ambient temperature of air entering the engine will drop as latent heat within
that air is consumed in the process of vaporizing droplets of liquid gasoline
into the combustible air/fuel mixture. The manifold heat valve forces hot
exhaust gases up around the base of the carburetor and the intake manifold
plenum, (the central area directly under the carburetor) to warm the mixture. If additional heat is not supplied, the gasoline can easily condense back into
a liquid as the air/fuel mixture comes in contact with the inner surfaces of the
intake manifold. This 2012-08-24
