This paper presents the feasibility to apply scavenging-port injection of a compressed natural gas (CNG) to a two-stroke spark-ignition engine. A two-cylinder production engine for boat racing is used as a test engine. Through a preliminary experiment with several methods of CNG flow-rate measurement, a reliable procedure could be established. The engine was run at a censtant speed of 3000 rpm and WOT condition, Comparing with the operation with a gas-mixer, by applying scavenging-port iTijection BSFC was decreased by 20 % and HC emission by 47 % at the best condition.Three methods of iniector installation and three types of fuel pipe attached to the irijector tip were included in the optimization process. A mechanism to explain the optimizing was also proposed on the basis of the consideration on the interaction between the flow of CNG jet and the scavenging flow, -409-Copyright@2004 JSME NII-Electronic
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.