Abstract
We made a study on the combustion chamber deposit (CCD) formation on a piston crown surface in a small two-stroke spark ignition engine. Lubrication oil flows were observed by generating CCD streaks (CCDS) from many small drilled holes on the piston crown. To understand the temperature influence on the heat degradation of the lubricant oil, (1) the oil on the conical cavity was heated statically in an electric furnace, and (2) oil was also dropped on the heated incline plate. The deposit streaks were formed on the heated plate along the oil flow line.
