Open Injector:
The Open type was a common injecting method used in earlier days. In an injection system, fuel from the tank goes to the combustion chamber, via a pump. The pump increases the pressure to convert the fuel into very particles. These fine particles evaporate more quickly and produce more power inside the combustion chamber. During the injection, the actual combustion starts when the fuel pressure is more than the pressure inside the combustion chamber. If the pressure is below the pressure inside the engine, a non return valve closes the passage, from where the fuel enters. Closing the passage may stop the injection process completely. Delivery pipe, which had been in earlier days, was short due to the space consideration inside the engine. Such system is totally dependent on the diameter and length of the delivery pipe, which often leads to problems like pre-ignition and after burning. So today, cars equip with closed type injector to overcome the disadvantages of the open type.
Close Injector:
In this type, the hydrostatic pressure is also considered for the opening and closing of the nozzle. There is a spring in the valve, which opens and closes according to the hydrostatic pressure. When the hydrostatic pressure, available at the valve is greater than the spring force, the valve opens. Opening of the valve also opens the passage to the nozzle. When the value of the hydrostatic pressure goes below some value, valve closes again and there is no fuel supply to the combustion chamber.
Nowadays, the close type also implements the sensors, which can react rapidly to changing inputs. It is also very sensitive to sudden acceleration and deceleration of the throttle. This increases the power output and performance of the engine, as well as provides economical savings. Due to these advantages, close type are widely used injectors nowadays.
Types of Nozzles
1. Single Hole: In this type, there is only a single hole at the center of the injector. Fuel injects into the combustion chamber through this hole. The fuel travels vertically downwards in such type of nozzle.
2. Multi Hole: In this type, there is more than one hole at the tip of the injector. The numbers of holes at the tip is depends on the many factors like size of the engine, power output of the engine. These types are widely used now days. It savings the fuel thereby increasing the power output.
John is a passionate auto expert aiming towards keeping the auto repairs simple and effective at no extra cost. He is sharing his best knowledge on nissan sentra fuel injector replacements.
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