The basic principle of Motorcycle Engine

From the bottom to top dead center of the piston dead center, it will complete the intake and compression work process, belongs to the first stroke of the piston reciprocates. Downward movement of the piston from top dead center TDC,two wheel cub motorcycle will complete combustion and expansion (for power) and exhaust work process, it belongs to the second piston reciprocating stroke. When the piston from the bottom up dead dead center and all off ventilation and exhaust ports, the exhaust and ventilation process is terminated, fresh combustible mixture in the cylinder compression will begin at the beginning. At the same time as the piston moves upward, the piston below the crankcase capacity increases, so that the pressure drop and the formation of the crankcase vacuum, when the degree of vacuum in the crankcase to a certain extent, the reed valves automatically open, the atomizing carburetor The combustible mixture is drawn into the crankcase. When the piston continues upward movement, when the top dead center to be close to issuing a spark from the spark plug, which has been compressed combustible mixture ignited.two wheel cub motorcycle In this case the rapid expansion of burning gases, the combustion chamber temperature and pressure rise sharply, forcing the piston downward movement, i.e. as useful work by the piston rod, a crankshaft. When the piston from the TDC TDC downward movement, the crankcase pressure will increase with decreasing volume, the reed valve will gradually shut down automatically, this time into the crankcase of the combustible mixture starts to be pre-compressed ʱ?? When the piston down to the exhaust port open, exhaust gases through the exhaust port to the exhaust pipe, silencer into the atmosphere. When the piston then continue down to the ventilation port is enabled, two wheel cub motorcycle the crankcase is pre-compressed fresh combustible mixture will enter through the ventilation opening of the cylinder, and drive the exhaust gas inside the cylinder further discharge, this process is called scavenging process. This engine will complete a cycle of work.