How does four-stroke engine performance compare with two-stroke engine performance?
The basic strength of the two-stroke engine is that every second stroke is a power stroke. Only one in four strokes is a power stroke in a four-stroke engine. This fundamental difference provides a significant power-to-weight advantage for the two-stroke engine. While the two-stroke engine has an advantageous power to weight ratio, it is noisy and releases high levels of hydrocarbons directly into the atmosphere.
