| A rotary valve engine describes the induction of a | | | | valve engine has the best intake air control. The |
| two stroke engine. Most rotary valve engines are | | | | rotary valve rotates mechanically in a circular |
| rotax engines. Although other rotary engines have | | | | motion. This motion allows the intake port to be |
| been made such as suzuki and kawasaki engines. | | | | opened and closed at the best possible time. The |
| Rotax engines are used in snowmobiles, jet-skis, | | | | rotary valve also allows the port to have no |
| motorcycles and aircraft engines. A rotary valve | | | | restriction such as the reeds cause. The timing of |
| refers to the intake of a two stroke engine. | | | | the rotary plate can be changed by the shape of |
| There are three types of intake designs for two | | | | the valve and is done in some racing engines.Most |
| stroke engines.Simplistic two strokes are piston | | | | rotary valve engines are two cylinder engines that |
| port, meaning that the piston movement past the | | | | are driven off of a gear in the crankcase |
| port controls the incoming air timing. The piston | | | | between the cylinders. Some three cylinder |
| port engine doesn't do a very good job of | | | | engines have been made with rotary valves but |
| keeping the airflow to stay in the engine. The air | | | | are too complex for a standard production |
| can simply travel back out of the engine. The | | | | engines. Rotary valve engines are a very good |
| most popular intake air induction is the reed port | | | | design with complete control of airflow into an |
| engine. It uses reed petals to allow the intake air | | | | engine. They also keep the air in without any |
| into the engine and traps it there. The tension of | | | | airflow restrictions.Jerry Lemke is the author of A |
| the reed petals can change with the use of | | | | website dedicated to teaching about engine |
| different petals and can provide some power | | | | designs, repairs, and modifications to all types of |
| improvement at certain rpm ranges.A rotary | | | | vehicles. |