Calculate Engine Displacement

Engine Displacement Formula:

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

Engine Displacement (Disp):

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1. What is Engine Displacement?

Engine displacement is the total volume of all the cylinders in an engine. It's a key measurement that indicates the engine's size and potential power output, typically measured in cubic inches, cubic centimeters, or liters.

2. How Does the Calculator Work?

The calculator uses the engine displacement formula:

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

Where:

\( Disp \) — Engine displacement (cubic inches)
\( B \) — Cylinder bore diameter (inches)
\( S \) — Piston stroke length (inches)
\( N \) — Number of cylinders
\( \pi \) — Mathematical constant (approximately 3.1416)

Explanation: The formula calculates the volume of a single cylinder (πB²S/4) and multiplies it by the number of cylinders to get total displacement.

3. Importance of Engine Displacement

Details: Engine displacement is a primary factor in determining an engine's power potential, fuel consumption, and emissions. Larger displacement engines typically produce more power but may consume more fuel.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: How is displacement related to engine power?
A: Generally, larger displacement engines can produce more power, but efficiency, technology, and forced induction also play significant roles.

Q2: Can I calculate displacement in different units?
A: Yes, but all measurements must use consistent units. For cubic centimeters, multiply the result by 16.387. For liters, divide cubic centimeters by 1000.

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.

Q4: Why is π used in the formula?
A: π is used to calculate the circular area of the cylinder bore (πr²), which is then multiplied by stroke length to get cylinder volume.

Q5: Does displacement affect fuel economy?
A: Generally, larger displacement engines consume more fuel, but modern technologies like cylinder deactivation and turbocharging can improve efficiency.