Fuel injectors

Fuel injectors



The function of a fuel injector is to spray atomized fuel into the combustion chamber of an internal combustion engine. Fuel injection became the primary fuel delivery system in automobiles starting in the mid-1980s. The spray from a fuel injector can be continuous or intermittent.

Definition of a Fuel Injector

The fuel injector is a small nozzle into which liquid fuel is injected at high pressure. It works like a spray nozzle of a pressure washer. The placement of the injector can be in a different part of the engine depending upon the type of fuel injection system is being used. High pressure from the fuel pump feeds the fuel to the fuel injector.

Precise Fuel Metering

The fuel injector meters the fuel more precisely than a carburetor. Therefore, no fuel is wasted. The result of such precise metering is increased power, lower emissions and lower fuel consumption. The right amount of fuel is squirted into the combustion chamber or throttle body. Excess fuel goes back to the fuel tank. A metering unit delivers fuel to the fuel injectors, according to the Reader's Digest Complete Car Care Manual.

General Motors said in 1982 that the fuel injection system delivers the proper amount of fuel after the electronic control module reads manifold vacuum, engine temperature and engine rotations per minute.

Maximum Airflow

The fuel injector also frees the intake system for maximum airflow. The accelerator pedal is not necessarily a gas pedal. It controls the position of the throttle plate. The airflow is increased or decreased depending upon the accelerator's position.

The airflow and fuel mixture is optimized by the engine control unit hundreds of times per second. The airflow and fuel mixture determine the length of time the fuel injector sprays fuel into the port, according to Auto Media.

Fuel injection Modes

The fuel injector of a continuous fuel injection system sprays fuel into the intake port on a continuous basis. This type of injector has been suitable for the use in passenger cars.

The intermittent fuel injection system has the fuel injector spray fuel into the intake port at specific intervals. This mode has been the basis for diesel engines ever since they were first manufactured, according to the Reader's Digest Car Complete Car Care Manual.



Source: What Is the Function of a Fuel Injector? | eHow.com

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Wow ..................what a amazing explanation ? you have explained it in such a nice way .Your information is quite informative........

thanks to the source Nick

its a good read indeed

My mate has a 999 CC injectors in his R34 GTT Skyline

Can you tell me about the Audi " urq Distributor " .What it works ?

distributors are relatively easy to understand, the hub in the center rotate at same speed as that of camshaft as provide a source of ignition in the combustion chamber by virtue of the spark plugs, the distributor directs a high voltage from the ignition coil(which increases the voltage from 12v to several thousand volts) to the spark plug, for timing purposes it has a hall effect sensor which gives a pulsed output to determine the cam position for fuel injection

Thanks Dhhawal for describing distributors .But can we make it through own if have some problem in it .

i am sorry buddy, but you can't each ignition system is designed according to the need, i.e each sensor has its threshold voltage that is to say that if any of the sensors give more or less output than the original one it won't work...this relates to cars with electronic ignition system, i could give you some pointers if you could tell me which car this concerns..