Generally speaking, there are two types of carburetor parts,
fixed choke and constant depression. The former one makes the varying
air pressure in the venture alter the fuel flow. While the later type
vary the airflow to change the fuel jet opening which in turn altars
the fuel flow. A vacuumed operated piston connected to a tapered
needle, which slides inside the fuel jet, does this. And the most
common variable choke type carburetor is the side draft SU carburetor,
which is simple in principle to adjust and maintain.
Although the differences between the two types of carburetors are extensive, the main function of these two are same. They all need to measure the airflow of the engine at any time, and then deliver the correct amount of fuel to keep the fuel and air mixture perfect and then mix the fuel and air evenly. A carburetor must provide the proper fuel and air mixture under a wide variety of different circumstances. Besides, engine speed range, random events could affect the performance of the carburetor, for example, when you accelerating, or waiting at a red light, etc. In addition, most carburetors contain a complex set of mechanism which called circuit to support several different operating modes.
You know, if the car has electronic controlled injection intake instead of a carburetor, it will automatically adjust the intake depending on previous programmed numbers and algorithms provided by the manufacturer. A carburetor on the other hand will usually not have any computer components, thus making the fuel and air mixture controlling purely mechanical. Also an injection intake will separate the air from the fuel allowing it to inject them independently from each other, while the carburetor will accomplish both simultaneously as the throttle is opened.
In addition, another significant difference between a carburetor and an injection is the way it is utilized when cold starting an engine. When the engine is cold, fuel vaporizes less readily and tends to condense on the walls of the intake manifold, starving the cylinders of fuel and making the engine difficult to start. Therefore, a richer mixture (more fuel to air) is required to start and run the engine until it warms up. You know, in an injection engine a computer will control this automatically, but again the carburetor has to do this manually.
All in all, everything has its own advantages and disadvantages, you can fairly choose the one base on your needs.
Although the differences between the two types of carburetors are extensive, the main function of these two are same. They all need to measure the airflow of the engine at any time, and then deliver the correct amount of fuel to keep the fuel and air mixture perfect and then mix the fuel and air evenly. A carburetor must provide the proper fuel and air mixture under a wide variety of different circumstances. Besides, engine speed range, random events could affect the performance of the carburetor, for example, when you accelerating, or waiting at a red light, etc. In addition, most carburetors contain a complex set of mechanism which called circuit to support several different operating modes.
You know, if the car has electronic controlled injection intake instead of a carburetor, it will automatically adjust the intake depending on previous programmed numbers and algorithms provided by the manufacturer. A carburetor on the other hand will usually not have any computer components, thus making the fuel and air mixture controlling purely mechanical. Also an injection intake will separate the air from the fuel allowing it to inject them independently from each other, while the carburetor will accomplish both simultaneously as the throttle is opened.
In addition, another significant difference between a carburetor and an injection is the way it is utilized when cold starting an engine. When the engine is cold, fuel vaporizes less readily and tends to condense on the walls of the intake manifold, starving the cylinders of fuel and making the engine difficult to start. Therefore, a richer mixture (more fuel to air) is required to start and run the engine until it warms up. You know, in an injection engine a computer will control this automatically, but again the carburetor has to do this manually.
All in all, everything has its own advantages and disadvantages, you can fairly choose the one base on your needs.
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