What does the term "injector flow rate" refer to?

The term "injector flow rate" specifically refers to the amount of fuel delivered by the injector per unit of time, typically measured in units like liters per hour (L/h) or gallons per hour (GPH). This measurement is essential because it directly impacts the engine’s performance and efficiency.

Understanding the injector flow rate helps determine how much fuel is needed for various operating conditions, ensuring optimal combustion and preventing issues such as engine knocking or excessive emissions. A proper flow rate is critical for achieving the desired air-fuel mixture, leading to efficient engine operation.

The other options, while related to injector performance, do not accurately define the flow rate itself. For instance, the speed of injector operation relates to how quickly the injector can open and close but does not specify the quantity of fuel being delivered. The pressure difference across the injector can influence flow but does not define what the flow rate is. Finally, the temperature of the injector is important for its function but again does not pertain to the flow rate measurement.