Cubic Inch Calculator Bore Stroke

Cubic Inch Formula:

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

Cubic Inches (CI):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the Cubic Inch Calculation?

The cubic inch calculation determines engine displacement by measuring the total volume swept by all pistons in an internal combustion engine. It's a fundamental measurement of engine size and capacity.

2. How Does the Calculator Work?

The calculator uses the cubic inch formula:

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

Where:

\( CI \) — Cubic inches (engine displacement)
\( B \) — Bore diameter (inches)
\( S \) — Stroke length (inches)
\( N \) — Number of cylinders
\( \pi \) — Mathematical constant (approximately 3.14159)

Explanation: The formula calculates the volume of a single cylinder (π/4 × B² × S) and multiplies by the number of cylinders to get total engine displacement.

3. Importance of Engine Displacement

Details: Engine displacement directly relates to engine power output, torque characteristics, and fuel consumption. Larger displacements generally produce more power but consume more fuel.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between cubic inches and liters?
A: Cubic inches and liters are both units of volume. 1 liter equals approximately 61.02 cubic inches. Most modern engines use liter measurements.

Q2: How does bore/stroke ratio affect engine performance?
A: Oversquare engines (bore > stroke) typically rev higher and produce more peak power, while undersquare engines (stroke > bore) produce more torque at lower RPMs.

Q3: Can I use metric measurements?
A: This calculator uses inches. For metric measurements (mm), convert to inches first (1 inch = 25.4 mm) or use a metric displacement calculator.

Q4: What is a typical cubic inch range for engines?
A: Modern engines range from about 60-500 cubic inches for passenger vehicles, with performance engines reaching 600+ cubic inches.

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