1. What is the Injector Size Calculation?

The injector size calculation determines the required fuel flow rate for your Pontiac engine based on horsepower, fuel consumption, number of injectors, and their duty cycle. Proper sizing ensures adequate fuel delivery for optimal performance.

2. How Does the Calculator Work?

The calculator uses the injector size formula:

Where:

• \( HP \) — Engine horsepower
• \( BSFC \) — Brake specific fuel consumption (typically 0.45-0.55 lb/HP-hr for NA engines)
• \( n_{injectors} \) — Number of fuel injectors
• \( duty\_cycle \) — Injector duty cycle (typically 0.8 or 80%)

Explanation: The equation calculates the required fuel flow per injector while accounting for the percentage of time the injector is open during each cycle.

3. Importance of Proper Injector Sizing

Details: Correct injector sizing is crucial for engine performance. Undersized injectors can cause lean conditions and engine damage, while oversized injectors can cause poor idle and drivability issues.

4. Using the Calculator

Tips: Enter realistic horsepower numbers, use appropriate BSFC values (0.45 for NA, 0.55-0.65 for forced induction), and maintain a safe duty cycle (typically 80% max).

5. Frequently Asked Questions (FAQ)

Q1: What's a typical BSFC value for Pontiac engines?
A: Naturally aspirated Pontiacs typically use 0.45-0.50 lb/HP-hr, while forced induction engines may require 0.55-0.65 lb/HP-hr.

Q2: How many injectors do most Pontiac V8s use?
A: Most factory and aftermarket EFI systems use 8 injectors (one per cylinder).

Q3: What's a safe maximum duty cycle?
A: 80% (0.8) is generally considered the maximum safe continuous duty cycle for injectors.

Q4: Should I round up my injector size?
A: Yes, it's common practice to round up to the nearest available injector size for safety margin.

Q5: Does this work for carbureted systems?
A: No, this calculator is specifically for electronic fuel injection systems.