What Is The Difference Between An Fuel Injector And A Carburetor?

Engine Fuel Injection System

The injection is a fuel injection device. Formally known as Fuel Injection, injection is an integral part of forming the air and fuel mixture. More specifically, it injects fuel into the air it takes in.

The name of the device that injects fuel at this time is the injector. Of course, as we all know, the air-fuel mixture is sent inside the cylinder where it is compressed, burned, and expelled.

From Mechanical Injection to Electronically Controlled Injectors

Looking back in history, the first injections developed were mechanical. Unlike carburetors, fuel can now be injected without the constraints of gravity. Later, with the emergence of electronically controlled injection, it replaced the mechanical type.

The electronically controlled injection is a higher performance than mechanical injection. The ability to electronically control the engine using an ECU is the main difference from the mechanical injection.

In electronically controlled injection, various components are integrated as signals into the control unit. It has a wider range of structures, such as intake air, throttle sensor, exhaust temperature, water temperature, air-fuel ratio control, vehicle speed, oxygen concentration, etc., and its structure is more complicated than that of a carburetor.

What is the difference between an injector and a carburetor?

There is no difference in the sense that both fuel supply systems are designed to mix fuel with air to create an air-fuel mixture.

However, there are differences in how the fuel is mixed with the intake air and whether it is electronically controlled. Carburetors create an air-fuel mixture through a pressure differential inside the carburetor.

Its structure is to use the pressure difference between the intake passage inside the carburetor and the fuel storage area to create an air-fuel mixture. More specifically, the airflow is throttled by the Venturi tube, the air pressure on the side of the fuel chamber (reservoir) becomes relatively high, and the atomized fuel is injected into the intake air through the jet. It feels like the air-fuel mixture is done.

The carburetor does not have a control mechanism such as injection, and the concentration of fuel injected by the engine at low, medium, and high speeds is mechanically regulated. In other words, depending on the setting, the engine response will be better or worse.

How many injectors are used per cylinder?

Basically, the engines installed in cars today have one or two fuel injectors per cylinder. Multi-point injection is equipped with one injector per cylinder, and the dual injector is a type that prepares two injectors for one cylinder.

Air flow meters are classified according to the method used to measure intake air. Air flow meters are known as measuring plate type, Karman scroll type, and heat ray type, so-called L-type, which are typical types. Detects the amount of air sucked in.

There is also the D type, which uses a sensor to measure the negative pressure when the air is sucked into the intake manifold. Both sense intake air but measure it differently.