Fuel Vaporization Ice Next up is fuel vaporization ice, which is a result of the cooling effect when your fuel mixes with air and vaporizes in the carburetor. The occurrence of a small amount of ice may cause a relatively large reduction in airflow and manifold pressure. As the fuel evaporates, the temperature is lowered in the area where the evaporation takes place.

Pressure carburetors have been replaced mostly by fuel injection systems and have limited use on modern aircraft engines.

It occurs less frequently in systems in which the fuel is injected into the air downstream from the carburetor. Moisture freezes in this low pressure area and collects as ice on the low pressure side. Thus, the danger of fuel vaporization icing is practically eliminated. In general, danger from impact ice normally exists only when ice forms on the leading edges of the aircraft structure. Fuel evaporation ice or refrigeration ice is formed because of the decrease in air temperature resulting from the evaporation of fuel after it is introduced into the airstream.

A pressure-type carburetor discharges fuel into the airstream at a pressure well above atmospheric. The float-type carburetor, the most common of all carburetor types, has several distinct disadvantages.

This ice may enter the carburetor and gradually build up internally in the carburetor air metering passages and affect carburetor metering characteristics. Any moisture in the incoming air can form ice in this area. Fuel Evaporation Ice (carburetor Ice) A type of carburetor ice that forms in the throat of a float-type carburetor when the discharged fuel evaporates and lowers the temperature of the air passing through the carburetor. The effect that abrupt maneuvers have on the float action and the fact that its fuel must be discharged at low pressure leads to incomplete vaporization and difficulty in discharging fuel into some types of supercharged systems.

As the air is cooled, water vapor condenses into liquid water and freezes. This results in better vaporization and permits the discharge of fuel into the airstream on the engine side of the throttle valve. A large accumulation of ice may jam the throttles and cause them to become inoperable. A type of carburetor ice that forms in the throat of a float-type carburetor when the discharged fuel evaporates and lowers the temperature of the air passing through the carburetor. The rush of air across and around the throttle valve causes a low pressure on the rear side; this sets up a pressure differential across the throttle, which has a cooling effect on the fuel/ air charge. The effects of rapid maneuvers and rough air on the pressure-type carburetors are negligible since its fuel chambers remain filled under all operating conditions. A vane-type, engine-driven fuel pump that has a diaphragm connected to the pressure-regulating valve... A type of ice that forms on the throttle valve of an aircraft carburetor when the throttle is partia... A system in an aircraft carburetor used to supply additional fuel to the engine when the throttle is... A small hole in the fuel passage between the float bowl and the discharge nozzle of a float carburet... Ice that forms inside the throat of a carburetor installed on an aircraft reciprocating engine. See carburetor ice. Throttle ice is formed on the rear side of the throttle, usually when the throttle is in a partially “closed” position.

Throttle ice tends to accumulate in a restricted passage.

See carburetor ice. Since the float carburetor must discharge fuel at a point of low pressure, the discharge nozzle must be located at the venturi throat, and the throttle valve must be on the engine side of the discharge nozzle. As a result, ice readily forms in the venturi and on the throttle valve. As the fuel evaporates, the temperature is lowered in the area where the evaporation takes place. Any moisture in the incoming air can form ice in this area.

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