排气量

定义

$\mbox{displacement} = {\pi\over 4} \times \mbox{bore}^2 \times \mbox{stroke} \times \mbox{number of cylinders}$
bore:气缸孔径
stroke:冲程
number of cylinders:气缸数目

3.1416/4 * 102 * 5 * 4 = 1570 cm3 ≈ 1.57 liters