The calculation formula for engine capacity is: displacement (cc)=π/4 × cylinder diameter ² × piston stroke × number of cylinders, where π/4 is about 0.785, and the units for cylinder diameter and piston stroke are usually millimeters (mm). This value reflects the total volume of air and fuel mixture that all cylinders of the engine can inhale in a complete cycle, usually expressed in cubic centimeters (cc) or liters (L), for example, a 1.5L engine is 1500cc. The displacement directly affects the engine's power output and fuel efficiency. Generally speaking, the larger the displacement, the stronger the power, but the fuel consumption may also be higher. Modern engine technologies such as turbocharging and variable valve timing can achieve higher power output at smaller displacements while also considering fuel economy, which is why many new cars still perform well despite their small displacements. Understanding the displacement formula can help evaluate engine performance more rationally when choosing a car, but the actual driving experience is still influenced by factors such as tuning and gearbox matching.
