Fit for 2003 cummins common rail injectors How is the function of common rail injectors? Fuel Injectors are sized by their flow rate. Flow rate is a measurement of how much fuel can be delivered over time. It is listed in pounds per hour (lbs./hr.) or cubic centimeters per minute (cc/min.). The right size injector can supply enough fuel under full load conditions at an 80% duty cycle. How do I know what size injectors I need? What happens if you put bigger fuel injectors? What size injectors should I run? Are all injectors compatible? Transport Package:Neutral Packing Origin: China Car Make: Diesel Engine Car Body Material: High Speed Steel Certification: ISO9001 Carburettor Type: Diesel Fuel Injection Parts Vehicle & Engine:For SCANIA engine 112 EW,HW310 #Fit for 2005 common rail cummins injectors# 2006 common rail injectors 4d56 common rail injectors 5.9 common rail fuel injectors 5.9 common rail injector 5.9 common rail injectors The fuel injector is a precision device with very high machining accuracy, which requires a large dynamic flow range, strong anti-clogging and anti-pollution capabilities, and good atomization performance. The fuel injector receives the fuel injection pulse signal sent by the ECU to precisely control the fuel injection quantity. The spray characteristics of the injector include atomization particle size, oil mist distribution, oil beam direction, range and diffusion cone angle. These characteristics should meet the requirements of the diesel engine combustion system, so that the mixture formation and combustion can be perfected, and high power and thermal efficiency can be obtained. Electronically controlled injectors are the most critical and complex components in the common rail system, and are also the most difficult to design and process. The ECU controls the opening and closing of the solenoid valve to inject the fuel in the high-pressure rail into the combustion chamber with the best injection timing, injection quantity and injection rate. In order to achieve effective fuel injection starting point and precise fuel injection quantity, the common rail system adopts special fuel injector with hydraulic servo system and electronic control element (solenoid valve). The fuel injector is composed of a hole-type fuel injector similar to the traditional fuel injector, a hydraulic servo system (control piston, control measuring hole, etc.), a solenoid valve, etc. The diesel fuel injection system atomizes the fuel and distributes it among the components that mix with the air in the combustion chamber. It is mainly composed of fuel injector and injector body, and its installation position and angle on the cylinder head depends on the design of the combustion chamber. There are two types of injectors: open and closed. The open injector has a simple structure but poor atomization and is rarely used. Closed injectors are widely used in various diesel engines. The diesel engine inhales pure air during the intake stroke. Near the end of the compression stroke, The diesel oil is increased to more than 100MPa by the fuel injection pump, injected into the cylinder through the fuel injector, and mixed with the compressed high-temperature air in a short time to form a combustible mixture. Due to the high compression ratio of diesel engines (generally 16-22), the air pressure in the cylinder can reach 3.5-4.5MPa at the end of compression, and the temperature is as high as 750-1000K (while the gas mixture pressure of gasoline engines at this time will be 0.6-1.2MPa , the temperature reaches 600-700K), which greatly exceeds the self-ignition temperature of diesel. Therefore, after the diesel fuel is injected into the cylinder, it will spontaneously ignite and burn immediately after being mixed with the air in a very short time. The air pressure in the cylinder rapidly rose to 6-9MPa, and the temperature also rose to 2000-2500K. Driven by the high-pressure gas, the piston moves downward and drives the crankshaft to rotate to perform work, and the exhaust gas is also discharged into the atmosphere through the exhaust pipe. The ordinary diesel engine is driven by the engine camshaft, and the diesel oil is delivered to the fuel chamber of each cylinder by means of a high-pressure oil pump. This oil supply method should change with the change of the engine speed, and the optimal oil supply amount at various speeds cannot be achieved.