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PARTS OF A CARBURETOR

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by

Donna Mae Labao

on 19 January 2015

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Transcript of PARTS OF A CARBURETOR

PARTS OF A CARBURETOR
This disc-shaped valve controls air flow through the air horn.
When closed, it restricts the flow of air and fuel into the engine, and when opened, air flow, fuel flow, and engine power increase.
AIR HORN
FUEL BOWL
The Fuel Bowl holds a supply of fuel that is NOT under fuel pump pressure.
FLOAT CHAMBER
Holds a quantity of fuel at atmospheric pressure ready for use.
Its supply is refilled by a float driven valve.
The float rises with the replenished fuel level, closing off the inlet.
MAIN DISCHARGE TUBE
It is also called the main fuel nozzle.
It is a passage that connects the fuel bowl to the center of the venturi.
A diaphragm chamber is used if the engine must be operated in any orientation (for example a chain saw or a model airplane). The diaphragm is connected to the needle valve and as it moves inward it opens the needle valve to admit more fuel, thus replenishing the fuel as it is consumed. As fuel is replenished the diaphragm moves out due to fuel pressure and a small spring, closing the needle valve. A balanced state is reached which creates a steady fuel reservoir level, which remains constant in any orientation.
DIAPHRAGM CHAMBER
MAIN CIRCUIT
ACCELERATOR PUMP
It is the duty of the accelerator pump to provide the increase in fuel flow.
The carburetor has an accelerator pump built into the side of it which supplies a shot of fuel to ensure smooth acceleration. The accelerator pump connected by a linkage to the accelerator; when acceleration is required, the pump squirts a spray of fuel directly into the throat of the carburetor to momentarily increase the fuel-to-air concentration.
CHOKE
This makes the mixture leaner, so to compensate for this, a valve known as the 'choke' restricts the flow of air at the entrance
END.

It is also called the throat or barrel.
Air intake of a carburetor
The part which often fastens to the air horn body are as follows: the choke, the hot idle compensator, the fast idle linkage rod, the choke vacuum break, and sometimes the float and pump mechanisms.
VENTURI
It produces sufficient suction to pull fuel out of the main discharge tube .

THROTTLE VALVE
Discharge Tube
When the throttle is progressively opened, more and more air is allowed to flow through the pipe and into the engine.
Sucks fuel into the airstream through a jet in the center of the throat.
It holds all the parts of the carburetor.
CARBURETOR BODY
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