而优化设计的排气管和改进的计时器和活塞也有助于提高效率。
A better design for the exhaust pipes adds to the efficiency, along with modified timing and pistons.
发动机完整的循环要求有活塞的四个冲程：进气、压缩、做功、排气。
The complete cycle of an engine requires four piston strokes: intake, compression power, and exhaust.
这并不意味着活塞将以两倍于正常速度上下运动，因为浪费的火花出现在排气行程中，和没有任何压缩。
This does not mean that the plugs will wear at twice the normal rate, as the wasted spark is on the exhaust stroke, and is therefore under no compression.
应用推荐