Mixing and Change Preparation Effects in a Dual Chamber Stratified Charge Spark Ignition Engine

Experimental studies have been performed on a three-valve, single cylinder stratified charge engine in order to determine the effects of main chamber intake port injection and main chamber swirl on performance. Results indicate that injection timing affects hydrocarbon and carbon monoxide emissions but has little effect on NO_x emissions and performance. Main chamber swirl, generated through the use of an intake port mask, resulted in increased power, lower fuel consumption, lower carbon monoxide emissions, and higher hydrocarbon emissions at a given level of NO_x emissions. Changes in performance and emissions with swirl were attributed to improved mixing in the main chamber and an increased rate of combustion.