What does NOP stand for in the context of fuel injection?

In the context of fuel injection, NOP stands for Nozzle Opening Pressure. This term refers to the pressure at which a fuel injector opens to allow fuel to flow into the engine combustion chamber. Understanding Nozzle Opening Pressure is crucial for maintaining engine performance and efficiency. If the NOP is set too low, fuel may enter the combustion chamber prematurely, leading to incomplete combustion and potential engine knocking. Conversely, if it is set too high, it can result in poor atomization of the fuel and increase emissions. Proper calibration of the NOP ensures that the injector functions efficiently, providing the right amount of fuel at the right time for optimal engine operation.