Displacement Calculator Bore Stroke

Displacement Formula:

\[ Displacement = \pi \times (Bore/2)^2 \times Stroke \times Cylinders \]

Displacement:

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1. What is Engine Displacement?

Engine displacement is the total volume of all the cylinders in an internal combustion 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 potential power output.

2. How Does the Calculator Work?

The calculator uses the displacement formula:

\[ Displacement = \pi \times (Bore/2)^2 \times Stroke \times Cylinders \]

Where:

\( Bore \) — Cylinder bore diameter (mm)
\( Stroke \) — Piston stroke length (mm)
\( Cylinders \) — Number of cylinders in the engine
\( \pi \) — Mathematical constant (approximately 3.14159)

Explanation: The formula calculates the volume of a single cylinder (πr² × stroke) and multiplies it by the number of cylinders to get total engine displacement.

3. Importance of Displacement Calculation

Details: Engine displacement is crucial for determining engine performance characteristics, fuel efficiency, emissions classification, and vehicle taxation in many regions.

4. Using the Calculator

Tips: Enter bore and stroke measurements in millimeters, and the number of cylinders. All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What units are used for displacement?
A: Displacement is typically measured in cubic centimeters (cc), liters (L), or cubic inches (ci). This calculator outputs in cubic millimeters (mm³).

Q2: How does displacement relate to engine power?
A: Generally, larger displacement engines can produce more power, but many other factors like compression ratio, forced induction, and engine design also affect power output.

Q3: What is a typical displacement range for passenger cars?
A: Most modern passenger cars have displacements between 1.0L and 3.0L, though this varies widely by vehicle type and market.

Q4: Can I convert mm³ to liters?
A: Yes, 1 liter = 1,000,000 mm³. Divide the mm³ result by 1,000,000 to get liters.

Q5: Why are bore and stroke important beyond displacement?
A: The bore/stroke ratio affects engine characteristics - oversquare engines (bore > stroke) typically rev higher while undersquare engines (stroke > bore) produce more torque at lower RPMs.