Carburetors

The device which mixes air and fuel and supplies the engine with this air-fuel mixture is called a carburettors.It is connected before the engine.A simple carburettor consists of three basic parts.
1.Air horn
2.Float bowl and
3.A throttle body
Now, there is one type of carburettor called as fixed-venturi carburettor.The so called venturi is nothing but the partial vacuum produced due to air flow in carburettor.The region where this partial vacuum is produced is called venturi.The venturi is a small and restricted space.
The air flows in carburettor because the pressure outside is atmospheric while that inside is below atmospheric pressure.
The fuel tank supplies fuel to float bowl with the help of a pump.
Because of the pressure difference the fuel is pushed through the nozzle.The fuel then mixes with the incoming air.
The throttle valve is a component which allows the air to enter in the carburettor.
The more the vacuum generated the more air flows inside.
There is also a type of carburettor called as variable venturi carburettor.So by the name can you guess its working???