Automobile World

What is a Carburetor? What Does It Do?

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What is a Carburetor? What Does It Do?

What is a Carburetor? What Does It Do?

A carburetor is a device that regulates the mixture of air and fuel in internal combustion engines. One of the main tasks of the carburetor is to provide the fuel-air mixture necessary for the proper operation of the engine and to transmit this mixture to the engine. Carburetors are usually found in cars, motorcycles, generators and small motorized devices such as lawnmowers.


How Does the Carburetor Work?

The basic operating principle of the carburetor is based on a physical phenomenon called the Venturi effect. When the pressure of the rapidly moving air decreases, the fuel mixes with the air. The carburetor can adjust the amount and ratio of this mixture according to the needs of the engine.

  • Air Inlet: Air enters the carburetor by passing through the air filter.
  • Venturi: There is a narrow throat (Venturi pipe) through which air passes. This contraction increases the speed of the air and reduces its pressure.
  • Fuel Spraying: The falling pressure causes the fuel to withdraw from the jets of the carburetor and mix with the air.
  • Mixture: The prepared air-fuel mixture is sent to the intake manifold of the engine and combustion takes place in the cylinders.
  • Types of Carburetors Carburetors are divided into different types according to their structure and principles of operation
  • Fixed Venturi Carburetors: This is the most commonly used type. The Venturi diameter is fixed and the amount of air-fuel mixture is controlled by the throttle.
  • Variable Venturi Carburetors: In this type, the Venturi diameter varies according to the air flow, which allows for a more precise air-fuel mixture. The SU carburetor is an example of this type.
  • Double-Throated Carburetors: Designed for engines that produce more power. It has two separate throats and can provide more air and fuel at high speeds.
  • Quadrupole-Throated Carburetors: Used in performance engines. It has four separate throttles and is designed for high speed and power.

Advantages and Disadvantages of the Carburetor Advantages

Simple design and low cost. Maintenance and repair are easy. It can be used in various engine types.

Carburetor Visual


It is less efficient than modern fuel injection systems. Fuel economy is lower. Emission control is weak, it releases more harmful gases to the environment.

The Modern Alternative

Fuel Injection Systems Today, carburetors have largely been replaced by fuel injection systems. Fuel injection systems are managed by electronic control units (ECU) and adjust the air-fuel mixture much more precisely. These systems provide better fuel economy, lower emissions and overall higher engine performance.

What happens if the carburetor is broken?

If the carburetor in your car breaks down, you may encounter various problems. A carburetor is a part that allows the fuel to mix with air, allowing the engine to run. When it breaks down or does not work properly, problems such as the following may occur.

  • Reduced Engine Performance: A malfunction of the carburetor can prevent the engine from working properly and reduce the performance of your vehicle. The power of the engine may decrease and the acceleration ability may decrease.
  • Increase in Fuel Consumption: A defective carburetor can prevent the fuel from burning efficiently, which can lead to an increase in fuel consumption. The vehicle may consume more fuel.
  • Engine Shaking and Fluctuation: Carburetor problems may cause the engine to vibrate or fluctuate. The engine's working order may be disrupted and the vehicle may become unstable.
  • Difficult Start-up: A broken carburetor can cause your car to have a difficult start. Starting the engine for the first time or starting it in cold weather may be more difficult.
  • Exhaust Emissions: Failure of the carburetor to function properly may increase the exhaust emissions of your vehicle. This in turn can increase the risk of environmental impacts and failing emissions tests.
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