Bore Stroke Calculator Mm

Engine Displacement Formula:

\[ Disp_{cc} = \pi \times \left(\frac{B_{mm}}{2}\right)^2 \times S_{mm} \times N_{cyl} \]

Engine Displacement (Disp_cc):

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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's a key indicator of an engine's size and potential power output, typically measured in cubic centimeters (cc) or liters (L).

2. How Does the Calculator Work?

The calculator uses the engine displacement formula:

\[ Disp_{cc} = \pi \times \left(\frac{B_{mm}}{2}\right)^2 \times S_{mm} \times N_{cyl} \]

Where:

\( B_{mm} \) — Cylinder bore diameter in millimeters
\( S_{mm} \) — Piston stroke length in millimeters
\( N_{cyl} \) — 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 displacement.

3. Importance of Displacement Calculation

Details: Engine displacement is a critical factor in determining an engine's power characteristics, fuel efficiency, and emissions. It's used for engine classification, performance comparisons, and regulatory purposes.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why is displacement measured in cubic centimeters?
A: Cubic centimeters provide a precise measurement of engine size. 1000cc equals 1 liter, which is another common unit for engine displacement.

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 significantly affect power output.

Q3: What's the difference between bore and stroke?
A: Bore is the diameter of the cylinder, while stroke is the distance the piston travels from top to bottom. These dimensions determine the engine's displacement and influence its power characteristics.

Q4: Can I use this calculator for any engine type?
A: This formula works for most piston engines (gasoline, diesel, etc.) but may not apply to rotary engines or other unconventional engine designs.

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