What are the different types of Carburetors?

In the previous article, we have discussed the simple Carburetor construction and the working principle. In this article, we are going to discuss the different types of Carburetors.

Carburetors classification

• By the direction of flow
• By multi-venture
• By the multi-jet
• By Multi-barrel

By direction of flow

Following are the different types of Carburetors based on the direction of flow.

1. Updraught
2. Downdraught
3. Cross-draught

1. Updraught Carburetor

In this type of Carburetor, the air enters at the bottom and leaves at the top. So the flow of air is an upward direction. In this Carburetor, the injected fuel from the main jet supposed to be lifted by the upward air friction/velocity. This is the main disadvantage of this Updraught Carburetor. The Lifting of the fuel can be done when it is used for the small mixing tubes only.

Due to the small mixing tube, this cannot provide enough mixture when the engine is running at high speeds. That is why they build the downdraught Carburetor.

2. Downdraught Carburetor

In this type of Carburetor, the air enters from the top and leaves at the bottom. So the flow of air is the downward direction. This Carburetor doesn’t need to lift the fuel as like in the updraught Carburetor but it can be moved into the cylinders by means of gravity even though the engine running at low speeds. So the mixture tube and the throat can be made larger than the updraught Carburetor so that it can achieve high engine speeds and the specific outputs.

3. Cross-draught Carburetor

In this type of Carburetor, the mixture tube will be in a horizontal direction. The only advantage of this Cross-draught Carburetor is that there will be one right angle bend in the passage will be eliminated. So that the resistance to the flow will be reduced a little bit.

By Multi-Venture

There are two multi-venturi types of Carburetors.

1. Double Venture Carburetor
2. Triple Venture Carburetor

As you can see the double venturi having two ventures. one is the main venturi and the second one is the boost venturi. As well as there is a triple venture Carburetor having a primary, secondary and the main venturi as shown in the schematic diagram.

This arrangement of additional ventures will result in the following advantages

• High depression will create at the fuel injected that results in better control over fuel flow and improved fuel atomization.
• Excellent low-speed full throttle operation is possible
• The Efficient air-fuel mixture can be obtained
• Reducing the condensation of the fuel
• A Constant air-fuel ratio can be maintained for high-speed systems.

By Multi-Jet

This multi-jet Carburetor is having multiple fuel jets for the different speed of the engine speeds. Check Carter Carburetor is one of the Multi-Jet Carburetors used in the automobile.

By Multi-Barrel

Multi-barrel means which is having two outlets in the Carburetors with the two throttle valves and the two idling screws adjustments. This two outlets will be connected to the two inlet manifolds of the engine cylinders. So one single multi-barrel Carburetor unit comes with the two Carburetors in it. This kind of Carburetors will be used in the 6 cylinders. Out of six cylinders, 3 cylinders will be connected to one barrel of the Carburetor, and the other 3 will be connected to the other barrel. In the case of 8 cylinder engines, we will use a 4 barrel outlet Carburetors.

Conclusion

We have discussed the different types of Carburetors based on the direction of flow and the multi-venturi, Multi-jet and the multi-barrel. Let us know your thoughts in the comments section below.