Diesel Precombustion Chamber Design and Its Influence on the Engine Performance and Exhaust Pollutants

One-cylinder Lister SR1, four-stroke, air-cooled engine,, with direct injection was redesigned and reworked into an indirect injection engine -- precombustion chamber type. Basic design features and the limitation of the test head and of the precombustion chamber in particular are described. Fifteen different prechambers were tested; the results are presented and discussed. A correlation of the prechamber design parameters such as ratio of height to diameter; number, size, downward and spread angle of connecting passageways, and ratio of prechamber volume to total compression volume has been made with engine performance and exhaust pollutants.