Often asked: What Is Main Metering Jet Carburetor Quizlet?

What is main metering jet?

A main metering orifice, or jet, is placed in the fuel passage between the float chamber and the discharge nozzle to limit the fuel flow when the throttle valve is wide open. It is this pressure difference, or metering force, that causes fuel to flow from the discharge nozzle.

What is the purpose of the main metering jet?

What is the function of a metering jet? The main metering jet is placed in the fuel passage between the float chamber and the discharge nozzle. Its purpose is to limit the fuel flow when the throttle valve is wide open.

What is the purpose of the venturi quizlet?

The venturi performs three functions. It proportions the fuel-air mixture, lowers the pressure at the discharge nozzle, and limits airflow at full throttle. The principle operation of the carburetor depends on the differential between the atmospheric pressure, and the decreased pressure offered by the venturi.

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What is the main metering system?

The main metering system supplies fuel to the engine at all speeds above idling. The fuel discharged by this system is determined by the drop in pressure in the venturi throat. A separate system is necessary for idling because the main metering system can be erratic at very low engine speeds.

Where is the main idling jet located?

In order to allow the engine to idle, a fuel passageway is incorporated to discharge fuel from an opening in the low pressure area near the edge of the throttle valve. [Figure 2-14] This opening is called the idling jet.

How do you check the accelerator pump in a carburetor if working properly?

Open the throttle quickly. You should see the accelerator pump system discharge a squirt of fuel into each primary barrel. The flow should continue for a few seconds after the throttle valve reaches the wide-open throttle position. If not, the accelerator pump system is defective.

How does an economizer work on a carburetor?

For an engine to develop maximum power at full throttle, the fuel mixture must be richer than for cruise. A typical economizer system consists of a needle valve which begins to open when the throttle valve reaches a predetermined point near the wide-open position.

Which type of carburetor has a float?

A type of carburetor used in reciprocating engines. In this carburetor, the fuelmetering force is produced by a float-operated needle valve that keeps the fuel level a constant distance below the edge of the discharge nozzle.

What is the main purpose of venturi in the carburettor?

Explanation: The purpose of the venturi in the carburetor is to increase the air velocity. The venturi in carburetors is used to measure airflow in an engine.

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What is the purpose of an engine driven fuel pump bypass valve?

What is the purpose of an engine-driven fuel pump bypass valve? A) To prevent a damaged or inoperative pump from blocking the fuel flow of another pump in series with it.

Where is the throttle valve located on a pressure injection carburetor?

The throttle body controls the airflow with the throttle valves. The throttle valves may be either rectangular or disk shaped, depending on the design of the carburetor. The valves are mounted on a shaft, which is connected by linkage to the idle valve and to the throttle control in the cockpit.

What is the purpose of needle valve & float in a carburetor?

The needle rides inside the orifice. When the needle is forced all the way in it blocks the orifice and stops fuel from flowing into the float bowl. Fuel can flow into the float bowl when the needle is retracted from the orifice. The movement of the needle is controlled by the float position.

What is the difference between float type carburetor to pressure injection carburetor?

The basic difference between a float-type and a pressure-type carburetor is the delivery of fuel. The pressure-type carburetor delivers fuel under pressure by a fuel pump. The fuel-air mixture is then drawn through the intake manifold and into the combustion chambers where it is ignited.

What is used to control an automatic mixture control?

The automatic mixture control unit consists of a bellows assembly, calibrated needle, and seat. [Figure 2-27] The purpose of the automatic mixture control is to compensate for changes in air density due to temperature and altitude changes. This bellows responds to changes in pressure and temperature.

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