Lecture
Carburetor
Engr. Mansoor Ali Zaheer
Assistant Professor
Mechanical Engineering Department
University of Sargodha
What is a Carburetor?
It is a device ( Used in Internal combustion engine) for
mixing air with fuel in a system for the proper
burn of fuel.
The carburetor is only used in a petrol engine, where
spark ignition happens.
Functions of a Carburetor
The main function of carburetor is to mix air and gasoline
and provides a high combustion mixture.
It controls the engine speed.
It also regulates the air-fuel ratio.
Increase or decrease the amount of mixture according to the
engine speed and load changing.
To keep certain head of fuel in the float chamber all the time.
Vaporize the fuel and mix to air to a homogeneous air-fuel
mixture.
To supply the correct amount of air-fuel mixture at the
correct strength under all conditions of load and speed of the
engine.
A Simple or elementary Carburetor
A Simple or elementary Carburetor
A Simple or elementary Carburetor
Advantages of the Carburetor:
Carburetor parts are not as expensive as that of fuel
injectors.
With the use of a carburetor, you get more air and fuel
mixture.
In terms of a road test, carburetors have more power
and precision.
Carburetors are not restricted by the amount of fuel
pumped from the fuel tank which means that
cylinders may pull more fuel through the carburetor
that would lead to the denser mixture in the chamber
and greater power as well.
Disadvantages of the carburetor:
At very low speed, the mixture supplied by a carburetor is
so weak that, it will not ignite properly and for its
enrichment, at such conditions, some arrangement in the
carburetor is required.
The working of a carburetor is affected by changes in
atmospheric pressure.
More fuels are consumed since carburetors are heavier than
fuel injectors.
More air emissions than fuel injectors.
The maintenance costs of a carburetor are higher than the
fuel injection system.
