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