* Engine load: Under heavy acceleration, the injectors will spray for a longer duration to deliver more fuel. At idle, the spray duration is much shorter.
* Engine speed (RPM): Higher RPMs generally require shorter injection pulses because the engine cycles faster, but the overall amount of fuel injected per unit time might still be higher.
* Air/fuel ratio: The Engine Control Unit (ECU) constantly adjusts the injection duration to maintain the optimal air-fuel mixture for efficient combustion and emissions control.
* Fuel type: Different fuels might require slightly different injection strategies.
* Engine design: Different engine designs (e.g., direct injection vs. port injection) will have different injection strategies and durations.
Instead of thinking about a specific time, it's more accurate to consider the pulse width of the injector. This is measured in milliseconds (ms) and represents the duration the injector is electrically activated to open and spray fuel. Pulse width is dynamically adjusted by the ECU thousands of times per second to meet the engine's demands. Typical pulse widths can range from a few milliseconds at idle to tens of milliseconds under heavy load.
Trying to specify a single "correct" spray duration would be misleading and inaccurate. The proper duration is determined and controlled precisely by the sophisticated engine management system.
