Abstract
When a small size air-cooled Wankel rotary engine for general use is operated under about a half of maximum power output, irregular combustion phenomenon occurs. And when idling, a large cyclic variation due to complicated intermittent burning repeating firing and misfiring obstructs the smooth running of the engine. Consequently, an undesirable countermeasure such as raising of idling speed is required. Besides, there is another difficult problem that the exhaust gas temperature is very high compared with that of conventional piston engine. The causes of these troubles and their countermeasures are reported.
