What is Fuel Injection?
Fuel injection is the process of introducing fuel to an engine’s cylinder by means of a pump or atomizer. This process of injecting fuel was originally applied on diesel engines because diesel fuels are more viscous and are difficult to put in the cylinders with the presence of compressed air. In gasoline engines, fuel injection systems replace the carburetor part of the engine. Through the engine’s manifold, fuel is mixed with air with the resulting mixture directed to the cylinder. Many of today’s fuel injection systems are done with computers for better regulation.
For newer cars on the road today, fuel injection may be done in many different methods. One such method is Single-point or throttle body injection. This is said to be the simplest method wherein the car’s carburetor is replaced with nozzles which link to the engine’s manifold. Though this method was not so precise, it was still widely practiced for its ease of use and cost effectiveness. This method also paved the way for the Multi-Point Fuel Injection System, wherein nozzles are put in each of the engine’s cylinders near the intake port. This makes a shorter distance between the pump and the intake port resulting to fuel injected completely into the cylinders.
Another method is Sequential Fuel Injection, which is sometimes called “timed” injection. The injection process in this method is similar to the multi-port process involving several nozzles. The big difference is that each of the nozzles may be timed independently for fuel injection, resulting to a more efficient process. Others also do a process called “Direct Injection” which literally involves fuel injection directly into the combustion chamber, which is said to result to more precision in terms of fuel metering.
Fuel injections are done because they result to increased efficiency in fuel combustion, better fuel economy, and improved engine performance.