1. What is a Horsepower to CC Calculator?

Definition: This calculator estimates engine displacement in cubic centimeters (CC) based on horsepower and engine efficiency.

Purpose: It helps automotive enthusiasts and mechanics understand the approximate relationship between engine power and size.

2. How Does the Calculator Work?

The calculator uses the approximation formula:

Where:

• \( CC \) — Engine displacement in cubic centimeters
• \( HP \) — Horsepower rating
• \( 16.387 \) — Conversion factor (1 cubic inch = 16.387 cc)
• \( Efficiency Factor \) — Engine's power efficiency (typically 0.06-0.1)

Note: This is an estimation only. Actual CC varies by engine design, fuel type, and technology.

3. Understanding Engine Efficiency Factors

High Performance (0.1): Modern fuel-injected engines, performance vehicles
Average Engine (0.08): Typical passenger car engines
Small Engine (0.06): Lawn mowers, generators, small machinery

4. Using the Calculator

Tips: Enter the horsepower value and select an appropriate efficiency factor based on engine type.

5. Frequently Asked Questions (FAQ)

Q1: Why isn't there a direct HP to CC formula?
A: Horsepower depends on many factors beyond just displacement, including engine design, fuel system, and RPM.

Q2: How accurate is this estimation?
A: It provides a rough approximation. Actual values may vary ±15% depending on specific engine characteristics.

Q3: Why different efficiency factors?
A: Smaller engines are generally less efficient at converting displacement to power than modern automotive engines.

Q4: Can I use this for electric motors?
A: No, this calculator is for internal combustion engines only.

Q5: Where does the 16.387 factor come from?
A: It's the conversion from cubic inches to cubic centimeters (1 in³ = 16.387 cc), as HP/CI ratios are commonly known.