1. PETROL ENGINE

2. 1 CHARGING STROKE Piston moves outwards and suck gas
In trough valve A.

3. 4
COMPRESSION STROKE
Valve A closes, piston moves inwards, compresses gas 1/7th of original volume.

4. 3 -COMBUSTION STROKE piston descends ,spark having fired the gas , both valves closes

5. 4 Fly wheel Piston Connecting rod Crank shaft EXHAUST STROKE
Piston rises, driving spent gases out through valve B , valve A being closed .
Connecting rod
Crank shaft

6. THE END
NAME:-Bibhu, Raju, Preetish, Abhinash .
CLASS:-IX B
THANK YOU