The fuel injector typically has a specific flow rate. For example, it might have a flow rate in the range of around 600 - 900 cc/min at a certain fuel pressure (such as 300 kPa). This flow rate is crucial as it determines the amount of fuel that is sprayed into the combustion chamber per unit time, directly affecting the engine's power output and fuel - air mixture ratio.
2. Spray Pattern
It usually features a multi - hole spray pattern. For the Isuzu 4HK1/6HK1 engine application, the injector may have 4 - 6 holes. The spray angle of these holes is carefully designed to ensure proper atomization and distribution of fuel within the combustion chamber. The spray angle can vary from around 140° - 160° to achieve efficient mixing with air for a cleaner and more powerful combustion.
3. Injector Resistance
The electrical resistance of the fuel injector is an important specification. It might have a resistance value in the range of 12 - 16 ohms. This resistance value helps in controlling the current flow through the injector coil, which in turn controls the opening and closing of the injector nozzle precisely.
4. Operating Pressure
The fuel injector is designed to operate at a specific fuel pressure range. For these Isuzu engines, the operating fuel pressure could be around 20 - 30 MPa. This high - pressure environment allows the fuel to be sprayed in a fine mist, promoting better combustion and fuel efficiency.
5. Material and Durability
The body of the injector is often made of high - quality stainless steel or other corrosion - resistant alloys. The nozzle tip is usually made of a wear - resistant material such as a hardened ceramic. This construction ensures the injector's durability and resistance to the harsh chemical environment of the fuel and the high - temperature and high - pressure conditions within the engine.
It is designed to withstand a large number of injection cycles. For example, it may be rated for at least 100,000 injection cycles without significant degradation in performance.
