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Difference between carburetor and fuel injector

Difference between Carburetor and Fuel Injector

Carburetor and fuel injector are two very different devices that both play a vital role in the operation of an internal combustion engine.

What is a Carburetor?

A carburetor is a device that controls the air/fuel mixture in the engine.  It is used in spark ignition engines and usually consists of a metering device for controlling the amount of fuel supplied, with a throttle valve which sets the maximum speed at which fuel can enter the cylinder. 


What is a Fuel Injector?

Fuel injectors are used to atomize the fuel into the combustion chamber.

Fuel Injector

Difference between Carburetor and Fuel Injector

  • A carburetor is used to feed the air-fuel mixture into the cylinders. It does this by mixing air with fuel in the primary chamber which makes it easier for the spark plug to ignite. The flow of air through carburetors is usually controlled by throttle valves, although some cars have butterfly valves or rotary valves instead.
  • Fuel injection systems operate on similar principles as carburetors but they differ in their internal architecture and design.
  • Fuel Injectors increase the volumetric efficiency of the engine by increasing flame speed and thereby reducing turbulence in the intake manifold.
  • Fuel injectors inject a specific amount of fuel directly into each cylinder at one time so that combustion can take place evenly across all four cylinders. 
  •  Fuel injectors also help ensure a more even distribution of heat throughout the cylinder and prevent pre-ignition problems that occur when using carburetors alone, such as detonation or knocking noises from misfiring engines due to too much oxygen being present in the mixture before ignition takes place. 
  • In most modern engines, fuel injection is integrated with an electronic control system to provide accurate timing and feedback during operation.

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