![]() ![]() Under hot conditions, the fuel residues can evaporate and leave behind a waxy residue which can clog up and block the air intake and injectors. Heat soak can occur after the engine has been switched off. There are several reasons why the fuel injector nozzle can become clogged, such as contaminated fuel, internal deposits and heat soak. It is more accurate than other systems and can produce a high power output at low fuel consumption levels. ![]() Direct injection is commonly used for diesel engines and has been developed since the 1920s. Direct fuel injection: For this system, the fuel injectors spray the fuel directly into the combustion chambers, bypassing the intake valves.The injectors spray the fuel just before or as the intake valve opens up. Instead of spraying the fuel at the same time, each nozzle is timed to spray fuel separately. Sequential injection: A sequential injection is the upgraded version of the MPFI system, as it addresses the issue of potential fuel waste.The fuel can condense and become unusable. However, all the injectors spray at the same time which can leave some fuel behind in the cylinders until the next intake cycle. Multi-port fuel injectors (MPFI) distribute the fuel more precisely to get the right air-fuel ratio and are therefore more efficient than TBFIs. Multi-port injection: These systems include a separate injector nozzle for each engine cylinder, installed on each intake port (multiple ports).Although these systems have been developed over the years, they are still quite inaccurate. ![]() Similarly to the carburetor, Throttle body injectors inject fuel into the intake manifold, which then mixes with the air and is sucked into the engine cylinders. It was designed as a cheap alternative to the carburetor. Throttle body injection (TBI): One of the earliest fuel injection systems.Most modern cars use one of the following electronic injection systems: For example, they vary in terms of location, injection sequence, and operation. Types of fuel injector systemsĭifferent types of engines require different types of injectors depending on the needs of the car and fuel type. The timing of this is controlled by the car’s computer system. The electromagnetic coil then moves the plunger which opens up the pintle injector and triggers the spray nozzle. The fuel passes through a tiny filter and is held in the component’s reserve. The ideal air-fuel ratio is 14.7:1, known as the stoichiometric mixture.įuel injectors are supplied by the fuel rail as the fuel is pumped through the rail and into the injector. The precision of this process is a key factor for engine performance. The atomised nozzle ensures that the fuel is evenly distributed and the valves are timed to achieve the optimal air-fuel mixture and engine consistency. Modern fuel injectors are electronic valve mechanisms which spray pressurised liquid fuel into an internal-combustion engine. ![]()
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