1. What is the Fueltech Induction Rating?

The Fueltech Induction Rating calculates the required fuel injector flow rate based on engine horsepower, brake specific fuel consumption, number of injectors, and duty cycle. This ensures proper fuel delivery for optimal engine performance.

2. How Does the Calculator Work?

The calculator uses the Fueltech Induction Rating formula:

Where:

• \( HP \) — Engine horsepower
• \( BSFC \) — Brake specific fuel consumption (lb/HP-hr)
• \( n_{injectors} \) — Number of fuel injectors
• \( duty\_cycle \) — Injector duty cycle (fraction, typically 0.8 for 80%)

Explanation: The equation determines the minimum flow rate each injector must provide to support the engine's fuel requirements at maximum power.

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 can affect idle quality and low-speed drivability.

4. Using the Calculator

Tips: Enter engine horsepower, typical BSFC (0.45-0.55 for NA engines, 0.55-0.65 for forced induction), number of injectors, and desired duty cycle (typically 80% or 0.8 for safety margin).

5. Frequently Asked Questions (FAQ)

Q1: What is a typical BSFC value?
A: Naturally aspirated engines: 0.45-0.55 lb/HP-hr. Turbocharged/supercharged engines: 0.55-0.65 lb/HP-hr. Race engines may be higher.

Q2: Why use 80% duty cycle?
A: A 20% safety margin accounts for variations in fuel pressure, voltage, and ensures injectors aren't maxed out.

Q3: How does fuel pressure affect flow rate?
A: Injector flow changes with the square root of pressure ratio. Double pressure increases flow by ~1.4x (√2).

Q4: Should I account for future power upgrades?
A: Yes, it's common to size injectors for 10-20% more power than current to allow for future modifications.

Q5: What about ethanol or other fuels?
A: Ethanol requires ~30% more fuel flow than gasoline. Multiply gasoline injector size by 1.3 for E85.