1. What is the E85 Fuel Injector Size Calculation?

The E85 fuel injector size calculation determines the appropriate injector size needed when converting from gasoline to E85 fuel. E85 requires larger injectors due to its lower energy content and higher fuel consumption rate.

2. How Does the Calculator Work?

The calculator uses the E85 injector size formula:

Where:

• \( Old\_Size \) — Original gasoline injector size in lb/hr
• 1.47 — Conversion factor for E85

Explanation: The 1.47 multiplier accounts for E85's approximately 30% lower energy content compared to gasoline, requiring more fuel flow for equivalent power output.

3. Importance of Proper Injector Sizing

Details: Correct injector sizing is critical for engine performance and reliability. Undersized injectors can cause lean conditions and engine damage, while oversized injectors may affect idle quality and low-speed drivability.

4. Using the Calculator

Tips: Enter your current gasoline injector size in lb/hr. The calculator will determine the minimum recommended E85 injector size. Always round up to the nearest available injector size.

5. Frequently Asked Questions (FAQ)

Q1: Why is the multiplier 1.47?
A: E85 contains about 30% less energy per volume than gasoline, requiring about 47% more fuel flow for equivalent power output.

Q2: Can I use my existing fuel pump with E85?
A: You may need to upgrade your fuel pump as well, since E85 requires higher fuel flow rates.

Q3: Is this calculation accurate for all engines?
A: This provides a general guideline. For precise tuning, consult with your engine management system and consider duty cycle limits.

Q4: What about ethanol blends other than E85?
A: The multiplier changes with ethanol content. For example, E50 might use a 1.25 multiplier instead of 1.47.

Q5: Should I add any safety margin?
A: It's recommended to add 10-15% to the calculated value to account for variations in fuel quality and future power upgrades.