| 摘要 |
An exhaust controller includes an exhaust control valve. The exhaust controller is capable of adjusting an exhaust timing of a spark ignition type, two stroke internal combustion engine depending upon the rotational speed of the engine. The exhaust control valve has a structure and operation which greatly reduces exhaust leakage past the exhaust control valve. As a result, the scavenging efficiency and the charging efficiency are improved and the compression ratio of the engine is better maintained. In operation, the exhaust control valve maintains a relatively consistent cross-section throughout the exhaust gas flow passage. As a result, exhaust pressure is decreased, resulting in an increase in the output and efficiency of the engine. |
