Engine Size Calculator Bore Stroke

Engine Size Formula:

\[ Size = \pi \times (Bore/2)^2 \times Stroke \times Cylinders / 1000 \]

Engine Size:

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1. What is the Engine Size Calculation?

The engine size calculation determines the total displacement volume of an internal combustion engine. It represents the total volume swept by all the pistons and is typically measured in cubic centimeters (cc) or liters.

2. How Does the Calculator Work?

The calculator uses the engine size formula:

\[ Size = \pi \times (Bore/2)^2 \times Stroke \times Cylinders / 1000 \]

Where:

\( Bore \) — Cylinder bore diameter in millimeters
\( Stroke \) — Piston stroke length in millimeters
\( Cylinders \) — Number of cylinders in the engine
\( \pi \) — Mathematical constant (approximately 3.1416)

Explanation: The formula calculates the volume of a single cylinder (πr²h) and multiplies by the number of cylinders, then converts from cubic millimeters to cubic centimeters.

3. Importance of Engine Size Calculation

Details: Engine displacement is a key specification that indicates the engine's power potential, fuel consumption characteristics, and overall performance capabilities. It's used for vehicle classification, taxation, and performance comparisons.

4. Using the Calculator

Tips: Enter bore and stroke measurements in millimeters, and the number of cylinders. All values must be positive numbers with bore and stroke greater than zero, and cylinders at least 1.

5. Frequently Asked Questions (FAQ)

Q1: Why divide by 1000 in the formula?
A: The division by 1000 converts the result from cubic millimeters to cubic centimeters, which is the standard unit for engine displacement.

Q2: What are typical engine sizes?
A: Engine sizes vary widely from small motorcycle engines (125-1000cc) to car engines (1000-8000cc) and larger industrial engines. Most passenger cars range from 1000-3000cc.

Q3: How accurate is this calculation?
A: This provides the theoretical displacement. Actual effective displacement may vary slightly due to manufacturing tolerances and combustion chamber design.

Q4: Does engine size correlate with power output?
A: Generally yes, but power output also depends on many other factors including engine design, compression ratio, forced induction, and efficiency.

Q5: Can this formula be used for any engine type?
A: This formula works for most piston engines including inline, V, flat, and radial configurations, but not for rotary (Wankel) engines which use a different calculation.