FOURSTROKE PETROL ENGINE
The fourstroke engine is also called sometime as four cycle engine.The main components of the four stroke engine are piston assembly,connecting rod,cylinder,cylinder head,crank case,crank shaft,inlet and exhaust valves,valve operating mechanism and ignition system.The operation of the four stroke engine is illustrated.The four stroke petrol engine is works as herein.when the piston is moving upward and is close to TDC,the inlet valve is opened.As the piston move downward vacuum is created in the cylinder.Air fuel mixture is sucked in.The piston after reaching BDC begins to rise.At this point,the inlet valve is closed,and exhaust valve is already in the closed position.Now the piston moves upward,and compresses the charge temperature and pressure of the charge increase.
At the end of the compression stroke,an electric spark is produced .This ignites the mixture,combustion take place.High pressure thus developed forces the piston to move downward.The piston is connected to the crank shaft by the connecting rod.As such the crankshaft is rotated .After the power stroke,piston rises up.Now the piston pushes the combustion products out of the cylinder.As the piston approaches close to TDC.Intake valve is opened.Fresh charge begins to enter the cylinder.The cycle of operations gets repeated again & again and the engine continues to work.
The fourstroke engine is also called sometime as four cycle engine.The main components of the four stroke engine are piston assembly,connecting rod,cylinder,cylinder head,crank case,crank shaft,inlet and exhaust valves,valve operating mechanism and ignition system.The operation of the four stroke engine is illustrated.The four stroke petrol engine is works as herein.when the piston is moving upward and is close to TDC,the inlet valve is opened.As the piston move downward vacuum is created in the cylinder.Air fuel mixture is sucked in.The piston after reaching BDC begins to rise.At this point,the inlet valve is closed,and exhaust valve is already in the closed position.Now the piston moves upward,and compresses the charge temperature and pressure of the charge increase.At the end of the compression stroke,an electric spark is produced .This ignites the mixture,combustion take place.High pressure thus developed forces the piston to move downward.The piston is connected to the crank shaft by the connecting rod.As such the crankshaft is rotated .After the power stroke,piston rises up.Now the piston pushes the combustion products out of the cylinder.As the piston approaches close to TDC.Intake valve is opened.Fresh charge begins to enter the cylinder.The cycle of operations gets repeated again & again and the engine continues to work.
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