CARBURETOR ICING
One disadvantage of the float-type carburetor is its icing tendency. Carburetor ice occurs due to the effect of fuel vaporization and the decrease in air pressure in the venturi, which causes a sharp temperature drop in the carburetor. If water vapor in the air condenses when the carburetor temperature is at or below freezing, ice may form on internal surfaces of the carburetor, including the throttle valve.
FUEL/AIR MIXTURE
The blend of fuel and air is routed to the combustion chambers to be burned.
THROTTLE VALVE
The flow of the fuel/air mixture is controlled by the throttle valve. The throttle valve is adjusted from the cockpit by the throttle.
DISCHARGE NOZZLE
Fuel is forced through the discharge nozzle into the venturi by greater atmospheric
pressure in the float chamber.
VENTURI
The shape of the venturi creates an area of low pressure.
AIR INLET
Air enters the carburetor through the air inlet.
AIR BLEED
The air bleed allows air to be mixed with fuel being drawn out of the discharge nozzle to decrease fuel density and promote fuel vaporization.
FUEL INLET
Fuel is received into the carburetor through the fuel inlet.
FLOAT CHAMBER
Fuel level is maintained by a float-type device.
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