1. What is Injector Pulse Width?

Injector pulse width (PW) is the duration, measured in milliseconds, that a fuel injector remains open to deliver fuel to the engine. It's a critical parameter in engine management systems that determines the amount of fuel injected into the combustion chamber.

2. How Does the Calculator Work?

The calculator uses the pulse width formula:

Where:

• \( PW \) — Injector pulse width (milliseconds)
• \( \text{Fuel Required} \) — Amount of fuel needed (pounds per hour)
• \( \text{Injector Flow} \) — Injector flow rate (pounds per hour)

Explanation: The formula calculates how long the injector needs to stay open to deliver the required amount of fuel based on the injector's flow capacity.

3. Importance of Pulse Width Calculation

Details: Accurate pulse width calculation is essential for proper engine performance, fuel efficiency, and emissions control. It ensures the engine receives the correct air-fuel ratio for optimal combustion.

4. Using the Calculator

Tips: Enter fuel required and injector flow in lb/hr. Both values must be positive numbers. The result will be displayed in milliseconds (ms).

5. Frequently Asked Questions (FAQ)

Q1: What is a typical injector pulse width range?
A: At idle, pulse width is typically 1.5-3.5 ms. At wide-open throttle, it can range from 8-20 ms depending on engine size and injector flow rate.

Q2: How does injector flow rate affect pulse width?
A: Higher flow rate injectors require shorter pulse widths to deliver the same amount of fuel, while lower flow rate injectors need longer pulse widths.

Q3: What happens if pulse width is too long?
A: Excessively long pulse widths can cause rich air-fuel mixtures, leading to poor fuel economy, increased emissions, and potential engine damage.

Q4: How does engine RPM affect pulse width?
A: As RPM increases, available time for injection decreases, requiring higher fuel pressure or larger injectors to maintain proper fueling.

Q5: Can this calculation be used for all fuel types?
A: This calculation works for gasoline applications. Diesel systems have different considerations due to their higher injection pressures.