A Study on Advanced Low Exhaust Emission Two-Stroke Engine

The object of this study is to evaluate the effects of air-head stratified scavenging with lean combustion using a 34cc two-stroke spark-ignition engine on reducing THC and CO emission and improving thermal efficiency.

The result showed that the amount of short-circuiting mixture with a conventional Schnurle scavenging two-stroke engine was reduced from 30% to 9% with the air-head stratified scavenging two-stroke engine. Thermal efficiency was improved from 13.6% to 20.6%. As the result, the engine with air-head stratified scavenging in this study can conform to CARB 1999 or tier 2 emission standards regarding THC, CO and NO_x emission.