TWO STROKE PETROLENGINE
In the two stroke engine,ports(intake,exhaust&transfer ports)of different sizes and shapes are there in the cylinder wall at different levels and positions.The piston as it moves up&down in the cylinder opens and closes these ports.Piston controlled port two stroke engine is used widely in two wheelers.
In the piston controlled port two stroke engine,as the piston descends from TDC(power stroke)just before BDC,the piston crown opens the exhaust port.Expanding combustion products rush out.The downward movement of the piston compresses the mixture that has been previously sucked into the crankcase.Further downward movement of the piston,causes the piston crown to open the transfer ports.The transfer port and the transfer passages connect the cylinder with the crankcase.As such the mixture compressed to some extent and confined in the crankcase,now rushes through the transfer ports and fills the cylinder.The entering mixture sweeps the combustion products that may remain in the cylinder.After the piston reaching BDC,it begines to rise.Now the piston first closes the transfer ports and then the exhaust port.
From the instant of the closure of the transfer ports,the upward movement of the piston creates partial vacuum in the crankcase.As the piston moves further upward,at some instant,the bottom of the piston opens the intake port.Now because of the vacuum in the crankcase,airfuel mixture is sucked into the crankcase.Then the airfuel mixture is passed through the transferport and it will compressed in the cylinder by the piston.it will ignites by the sparkplug.Its the simple working of a two stroke petrol engine.
Watch the working of twostroke petrol engine:-ClickHere
In the two stroke engine,ports(intake,exhaust&transfer ports)of different sizes and shapes are there in the cylinder wall at different levels and positions.The piston as it moves up&down in the cylinder opens and closes these ports.Piston controlled port two stroke engine is used widely in two wheelers.
In the piston controlled port two stroke engine,as the piston descends from TDC(power stroke)just before BDC,the piston crown opens the exhaust port.Expanding combustion products rush out.The downward movement of the piston compresses the mixture that has been previously sucked into the crankcase.Further downward movement of the piston,causes the piston crown to open the transfer ports.The transfer port and the transfer passages connect the cylinder with the crankcase.As such the mixture compressed to some extent and confined in the crankcase,now rushes through the transfer ports and fills the cylinder.The entering mixture sweeps the combustion products that may remain in the cylinder.After the piston reaching BDC,it begines to rise.Now the piston first closes the transfer ports and then the exhaust port.From the instant of the closure of the transfer ports,the upward movement of the piston creates partial vacuum in the crankcase.As the piston moves further upward,at some instant,the bottom of the piston opens the intake port.Now because of the vacuum in the crankcase,airfuel mixture is sucked into the crankcase.Then the airfuel mixture is passed through the transferport and it will compressed in the cylinder by the piston.it will ignites by the sparkplug.Its the simple working of a two stroke petrol engine.
Watch the working of twostroke petrol engine:-ClickHere
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