For Port Fuel injectors there are 2 types of testing, Dynamic and Static. Static injector flow refers to the fuel flow rate when the injector is held fully open, while dynamic injector flow measures the flow rate during pulsed operation, simulating real-world engine conditions. Our port injector testing always includes both types of tests when applicable to the specific injector model. Some injectors, such as E-TEC, do not support static tests as an example. For GDI & Piezo injectors testing is computer controlled and both types of testing are performers as well. Here’s a more detailed explanation:
Static Flow:
- This is the flow rate when the injector is energized and held open continuously (100% duty cycle).
- It’s a simple measurement of the maximum output of the injector at a given pressure.
- Static flow is often used as a benchmark for injector capacity and is commonly expressed in units like lbs/hr or cc/min.
- Static flow output volume is generally much higher than dynamic flow since it operates like an open hose with unrestricted flow.
Dynamic Flow
- This measures the fuel flow rate when the injector is pulsed on and off, simulating the way injectors operate in a running engine.
- Dynamic flow is influenced by factors like pulse width (the time the injector is open during a pulse) and pulse frequency (the number of pulses per second).
- Dynamic flow testing is crucial for understanding how injectors perform under real-world operating conditions, including idling, acceleration, and deceleration.
- Dynamic flow is sometimes expressed in duty cycles, which is the percentage of time the injector is turned on during a pulse period.