Abstract
The objective of the present study is to examine the comparison of performance and exhaust emission characteristics between gasoline and CNG fueled to a 2-stroke spark-ignition engine. A water-cooled vertical in-line two-cylinder marine-racing engine with the stroke volume of 397 cc was used as the test engine. It is shown that as for CNG operation increasing the compression ratio has the effect to decrease the BSFC and expand lean-burn.limit. Furthermore, a trial of scavenging port injection was successfully done and has the possibility to realize stratified combustion, but we need to address several problems to make it more attractive.
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