Combustion chamber for two-cycle internal combustion engine

摘要

A cylinder for a two-cycle internal combustion engine is disclosed which enables reduction of HC in the exhaust gas while causing no substantial deterioration in output characteristics of the engine or requiring no complicated modifications. The combustion chamber 7 is a squish dome type having a ring-shaped squish surface 7d formed in a head portion 3 of cylinder 1 in which a pair of scavenging ports 20, 20 are oppositely formed and which employ loop scavenging mode symmetrical with respect to the longitudinal section bisecting the exhaust port 16, wherein said squish surface 7d is cut out at its portion opposite to the exhaust port 16 to form a scavenging air intake 7a.