Engine Displacement Calculator Bore Stroke

Engine Displacement Formula:

\[ V = \frac{\pi \times \text{bore}^2 \times \text{stroke} \times \text{cylinders}}{4} \]

Engine Displacement:

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Engine Displacement?

Engine displacement is the total volume of all the cylinders in an internal combustion engine. It's a key specification that indicates engine size and power potential, typically measured in cubic centimeters (cc) or liters (L).

2. How Does the Calculator Work?

The calculator uses the engine displacement formula:

\[ V = \frac{\pi \times \text{bore}^2 \times \text{stroke} \times \text{cylinders}}{4} \]

Where:

\( V \) — Engine displacement (cc)
\( \pi \) — Pi (~3.14159)
\( \text{bore} \) — Cylinder diameter (mm)
\( \text{stroke} \) — Piston travel distance (mm)
\( \text{cylinders} \) — Number of cylinders

Explanation: The formula calculates the volume of a cylinder (πr²h) for each cylinder and sums them up.

3. Importance of Displacement Calculation

Details: Displacement helps determine engine power characteristics, fuel efficiency, and emissions. Larger displacements generally produce more power but may consume more fuel.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between bore and stroke?
A: Bore is the diameter of the cylinder, while stroke is the distance the piston travels within the cylinder.

Q2: How does displacement relate to engine power?
A: Generally, larger displacement means more potential power, but actual power depends on many factors like compression ratio and engine design.

Q3: What are typical displacement values?
A: Motorcycles: 125-1800cc, Cars: 1000-8000cc, Trucks: 4000-16000cc. Modern passenger cars are typically 1000-3000cc.

Q4: How do I convert cc to liters?
A: Divide by 1000 (e.g., 2000cc = 2.0L). Engine sizes are often expressed in liters for larger engines.

Q5: What's a "square" engine?
A: An engine where bore equals stroke. Oversquare (bore > stroke) engines tend to rev higher, while undersquare (stroke > bore) engines produce more torque.