Understanding Carter Carburetor

Carter carburetor was founded by William Carter for four-cylinder engine jeeps. The Carter Carburetor is a downdraught model. It has several jets, a plain tube, and only one adjustment for the engine’s idle or low-speed operation. In this article, you’ll learn the definition, construction, parts, diagram, and working principle of a carter carburetor.

carter carburetor

Read more: Understanding carburetor

What is a carter carburetor?

Just as earlier stated, A down-draught carburetor is a Carter carburetor. Fuel or petrol enters the chamber of a Carter carburetor, while air enters through the choke valve, which is placed at the top. During normal engine operation, the choke valve remains open. It was started by William Carter, who was running a thriving cycling business at the time and began experimenting with vehicle carburetors. His initial carburetor, made of cast brass, could meter and distribute fuel more precisely than several competitors.

Diagram of a carter carburetor:

Carter carburetor diagram

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Construction & Working Principle

The gasoline is injected into the float chamber. During normal operation, air enters the carburetor from the top, and the choke valve in the channel remains open. There are three vents in this carburetor. The principal venturi, which is the smallest, is located above the fuel level in the float chamber. Other than that, two ventures are located below the fuel level and one is located below the other. The primary venturi’s suction is sufficient to extract petrol at very low speeds. The nozzle enters the primary venturi at an angle, atomizing the fuel and sending it upward against the air stream. The mixture from the primary venturi enters the secondary venturi, which is encircled by an air stream, and eventually flows to the final venturi.

The fresh air supply insulates the stream from the second venturi once again in the main venturi. The mixture is iIllatomized when it enters the engine. Multiple ventures allow for greater mixture formation at low speeds, resulting in stable and smooth functioning at both low and high speeds.

Watch the video below to learn more about the working of a carter carburetor:

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Below are the operations of a carter carburetor

Engine starting circuit

A richer mixture must be delivered when the engine is starting. The suction formed by the piston during engine startup is applied to the nozzle, allowing the right amount of gasoline to be delivered. The choke valve also reduces the amount of air available. To ensure that the proper amount of the richer mixture is prepared and introduced into the engine cylinder, the engine can start smoothly. When the engine begins, the spring-loaded choke valve opens to allow the proper amount of air to enter during the warm-up period.

Idle and Low-speed(Cruising) circuit

The richer mixture is necessary for tiny quantities for idle speed. The throttle valve is slightly open in this operating condition. In order for the suction caused by the piston’s downward movement to be applied to the optimal port. The idle/slow-speed jet provides a rich mixture in this way. The idle adjustment screw can manage the air-fuel ratio. The throttle can be opened wider for a low-speed operation to keep the engine running smoothly above idle.

Acceleration of Engine

As illustrated in the diagram above, there is an acceleration pump system. This will aid in the acceleration of the engine by delivering additional fuel via a jet at the direct throat. The non-return intake check valve and the outlet check valve, as well as a plunger and a spring-operated accelerator pedal, make up this acceleration pump. When we press the accelerator pedal, a little amount of gasoline is forced into the throat via the non-return inlet check valve, the outlet check valve, and the jet, as illustrated in the diagram above. When you let go of the pedal, some gasoline will be sucked from the float chamber.

Read more: Understanding Air Injection System

That is all for this article, where the definition, construction, parts, diagram, and working of a carter carburetor are been discussed. I hope you learn a lot from the reading, if so, kindly share with other students. Thanks for reading, see you around!