1. What is the Bore X Stroke Equation?

The Bore X Stroke equation calculates engine displacement from bore diameter, stroke length, and number of cylinders. It provides the total volume swept by all pistons in an internal combustion engine.

2. How Does the Calculator Work?

The calculator uses the Bore X Stroke equation:

Where:

• \( B \) — Bore diameter (millimeters)
• \( S \) — Stroke length (millimeters)
• \( N \) — Number of cylinders (unitless)
• \( \pi \) — Mathematical constant pi (approximately 3.1416)

Explanation: The equation calculates the volume of a single cylinder (πB²S/4) and multiplies by the number of cylinders to get total engine displacement.

3. Importance of Displacement Calculation

Details: Engine displacement is a key specification that indicates engine size and potential power output. It's crucial for engine design, performance tuning, and vehicle classification.

4. Using the Calculator

Tips: Enter bore and stroke in millimeters, number of cylinders as a whole number. All values must be positive (bore > 0, stroke > 0, cylinders ≥ 1).

5. Frequently Asked Questions (FAQ)

Q1: Why is displacement measured in cubic centimeters?
A: Cubic centimeters (cc) is the standard unit for engine displacement, though liters are also commonly used (1000cc = 1L).

Q2: How does bore/stroke ratio affect engine characteristics?
A: Engines with larger bore relative to stroke (oversquare) tend to rev higher, while engines with longer stroke (undersquare) produce more torque at lower RPM.

Q3: Can this formula be used for any engine type?
A: Yes, this formula works for all piston engines including inline, V, flat, and radial configurations.

Q4: Why divide by 4 in the formula?
A: The division by 4 comes from the area calculation of a circle (πr²) where radius is half the bore diameter (r = B/2).

Q5: How accurate is this calculation?
A: This provides theoretical displacement. Actual displacement may vary slightly due to manufacturing tolerances and combustion chamber design.