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Automover
Parts >> Auto
Mobile Systems >> Auto
Transport Fuel System >> Auto Mobile Carburetor
Auto Mobile CarburetorThe purpose of the carburetor
is to provide and meter the mixture of fuel vapor and air in relation
to the cargo and speed of the engine. Because of engine temperature,
speed, and load, perfect carburetion is very firm to obtain. The
carburetor supplies a small amount of a very rich petroleum mixture
when the engine is cold and running at idle. With the throttle cover
closed and air from the air cleaner incomplete by the closed
choke plate, engine suction is augmented at the idle-circuit
nozzle. This vacuum draws a thick spray of petrol through the nozzle
from the full float bowl, whose fuel line is closed by the float-supported
spine valve. More fuel is provided when the gas pedal is depressed
for acceleration. The pedal connection opens the strangle plate
and the choke plate to send air hurrying through the barrel. The
linkage also depresses the accelerator pump, as
long as added petrol through the accelerator-circuit nozzle.
As air passes through the thin center of the barrel,
called the "venturi", it produces suction that draws scatter
from the cruising-circuit nozzle. The float-bowl level drops and
causes the float to tip and the spine valve to open the fuel line.
To cause a liquid to flow, there must be a high force area (which
in this case is atmospheric pressure) and a low force area. Low
force is less than atmospheric pressure. The average person refers
to a low pressure area as a vacuum. Since the atmospheric force
is already present, a low pressure area can be created by air or
fluid flowing through a venturi. The downward motion of the piston
also creates a low weight area, so air and gasoline are
drawn through the carburetor and into the engine by suction produced
as the piston moves down, creating a partial vacuum in the cylinder.
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