Question

how we can generate power from four stroke petrol engine

Answer 1

Combustion of the air-fuel mixture causes an accelerated expansion of high pressure gases, which push the piston to the bottom of the cylinder during the power stroke, imparting rotation to the crankshaft.

Answer 2

Combustion of the air-fuel mixture causes an accelerated expansion of high pressure gases, which push the piston to the bottom of the cylinder during the power stroke, imparting rotation to the crankshaft.