Calculate Displacement From Bore And Stroke

Displacement Formula:

\[ Disp_{bs} = \frac{\pi B^2 S}{4} \times N \]

Displacement (Disp_bs):

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1. What is Engine Displacement?

Engine displacement is the total volume of all the cylinders in an engine. It represents the swept volume of all pistons moving from top dead center to bottom dead center and is a key indicator of engine size and power potential.

2. How Does the Calculator Work?

The calculator uses the displacement formula:

\[ Disp_{bs} = \frac{\pi B^2 S}{4} \times N \]

Where:

\( B \) — Bore diameter in millimeters
\( S \) — Stroke length in millimeters
\( N \) — Number of cylinders
\( \pi \) — Mathematical constant Pi (approximately 3.14159)

Explanation: The formula calculates the volume of a single cylinder using the cylinder volume formula (πr²h) and multiplies by the number of cylinders to get total engine displacement.

3. Importance of Engine Displacement

Details: Engine displacement is a fundamental measurement used to classify engines, determine tax brackets in some countries, and estimate potential power output. Larger displacement generally indicates more powerful engines capable of producing higher torque.

4. Using the Calculator

Tips: Enter bore and stroke measurements in millimeters, and the number of cylinders. All values must be positive numbers. The result will be displayed in cubic centimeters.

5. Frequently Asked Questions (FAQ)

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

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

Q3: Can I use inches instead of millimeters?
A: Yes, but you'll need to convert the result appropriately (1 cubic inch = 16.387 cubic centimeters).

Q4: Does displacement account for combustion chamber volume?
A: No, this calculation only measures displacement (swept volume). Compression ratio calculations include combustion chamber volume.

Q5: Why is displacement important for vehicle classification?
A: Many countries use engine displacement to determine vehicle taxes, insurance categories, and licensing requirements.