Description

Petrol Engine Model 4 Stroke PSAW Vertical flask type of demonstration model , on metal base. In a four stroke engine , to perform full cycle of operations. (changing the contents of cylinder and effecting combustion ) Four strokes of piston are required. This type of engine is used in motor bikes, Petrol driven cars and certain types types of scooters. This is an internal combustion engine. The vaporized fuel is mixed with air in carburetor . Yhis mixture is sucked by engine ( Intake stroke- 1st stroke) through inlet valve which opens. the descanding piston draws fresh petrol and air mixture into the cylinder. This mixture is compressed (Compression stroke 2nd stroke). During compression the mixture gets heated and ignition burns the fuel converting into a large volume of gas which pushed the piston . While the valves are closed the piston is pushed to the botton of the cylinder by the gases of combustion ( Power stroke - 3rd stroke ) The exhaust valve opens due to momentum gained by wheels, piston is pushed upwards and burnt gases are expelled ( exhaust stroke- 4th stroke).