1. What is an Engine Displacement Calculator?

Definition: This calculator computes the total swept volume of all cylinders in an internal combustion engine.

Purpose: It helps automotive engineers, mechanics, and enthusiasts determine engine size and performance characteristics.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( D \) — Engine displacement (cubic inches)
• \( B \) — Bore diameter (inches)
• \( S \) — Stroke length (inches)
• \( N_c \) — Number of cylinders

Explanation: The formula calculates the volume of a single cylinder (π/4 × bore² × stroke) and multiplies by the number of cylinders.

3. Importance of Engine Displacement

Details: Displacement is a key factor in engine power output, torque characteristics, and fuel efficiency. Larger displacements typically produce more power but may reduce fuel economy.

4. Using the Calculator

Tips: Enter the bore diameter (cylinder width), stroke length (piston travel distance), and number of cylinders. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is 0.7854 used in the formula?
A: This is π/4 (approximately 0.7854), which comes from the area formula for a circle (πr²) when expressed in terms of diameter.

Q2: How do I convert cubic inches to liters?
A: Multiply cubic inches by 0.016387 to get liters (e.g., 350 in³ × 0.016387 = 5.735 liters).

Q3: What's a typical bore/stroke ratio?
A: Most engines range between 0.8 to 1.2, with performance engines often having a "square" or "oversquare" (bore > stroke) design.

Q4: Does this account for combustion chamber volume?
A: No, this calculates displacement only. Compression ratio calculations would include combustion chamber volume.

Q5: What's the difference between displacement and horsepower?
A: Displacement measures engine size, while horsepower measures power output. Larger displacements can produce more power, but efficiency and design affect the relationship.