Abstract
This study describes a relation of combustion chamber deposit (CCD) generated on a piston of two-stroke cycle engine and flow influences of lubricant oil. Generation of the CCD is influenced by temperature, pressure, gas flow conditions and retention period of lubricant oil in a cylinder. In this report, we especially focused on a relationship among CCD streaks (CCDS) and an influence of flow on the deposit formation. In the results, (1) CCDS on a piston surface flows to the average direction of gas flow on there, (2) CCDS formed on the inclined heated plate along the flow lines of the lubricant oil has a pattern of the inclination angle and the generated length, (3) the viscosity of the lubricant oil becomes lower when the oil is heated up. However, when the oil deteriorates, the viscosity sometimes become higher.
