ATOMIZATION
"Atomization"
simply means breaking the liquid fuel up into
very small particles, so that it can more easily
vaporize and mix with the air.
With the fuel broken into small particles, there
is much more chance for air contact; the more
air contact, the better the vaporization.
METERING
Another "must"
for good combustion is a correct mixture ratio
between the fuel and air, commonly called the
"air-fuel ratio." To release all possible
energy by combustion, a given amount of fuel
must be mixed with a given amount of air. The
metering job of the carburetor is to furnish
the proper air-fuel ratio for various conditions,
so that engine operation will be neither too
lean for power requirements nor too rich for
economy.
DISTRIBUTION
For good combustion
and smooth, even operation, the air and fuel
must be thoroughly and uniformly mixed, delivered
in equal quantities to each cylinder and evenly
distributed within the combustion chamber. The
carburetor must furnish a properly distributed
mixture to the intake manifold; from that point
on, distribution depends mostly on engine design.
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