1. What is the Methanol Injector Size Calculator?

The Methanol Injector Size Calculator determines the required flow rate for methanol injectors based on engine horsepower, number of injectors, and duty cycle. Proper sizing is crucial for effective water/methanol injection systems.

2. How Does the Calculator Work?

The calculator uses the methanol injector sizing formula:

Where:

• \( HP \) — Engine horsepower
• \( n_{injectors} \) — Number of injectors
• \( 0.8 \) — Typical duty cycle (80%)
• \( 1.0 \) — BSFC (Brake Specific Fuel Consumption) for methanol

Explanation: The formula calculates the required flow rate per injector to support the engine's power output while maintaining a safe duty cycle.

3. Importance of Proper Injector Sizing

Details: Correct injector sizing ensures adequate methanol delivery for cooling and octane enhancement while preventing injector overwork or underperformance.

4. Using the Calculator

Tips: Enter engine horsepower, number of injectors in your system, and desired duty cycle (typically 0.8 for 80%). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is BSFC 1.0 for methanol?
A: Methanol has about half the energy content of gasoline, requiring roughly twice the fuel flow, hence the higher BSFC.

Q2: What's a safe duty cycle for methanol injectors?
A: 80% (0.8) is typical for continuous operation, allowing headroom for power spikes and injector longevity.

Q3: Can I use this for gasoline injectors?
A: No, gasoline BSFC is typically 0.5-0.6 lb/hr/HP. Use a different calculator for gasoline systems.

Q4: What if my system has different sized injectors?
A: This calculator assumes equal-sized injectors. For staged systems, calculate each stage separately.

Q5: How does nozzle placement affect sizing?
A: Post-turbo systems may require slightly larger injectors due to pressure differences, but this calculator provides a good starting point.