difference between an two stroke and four stroke petrol engine?

What's the difference between an two stroke and four stroke petrol engine?

Diesel Engine:

Diesel use air compression to ignite. diesel uses higher compression when is compressing the air. this is to create a higher temperature in side the cylinder to ignite the fuel.















Patrol Engine:
Four stroke patrol engines use spark plug to ignite fuel, a mixture of fuel and air.






















Two Stroke:What makes two stroke engines much different from the rest of the engines is that, they dont have  valves, they fire once every revolution which gives them more power boost. it also uses a mixture of fuel and air. the piston compresses the fuel and air in the combustion chamber while lets new fuel and air into the crankcase ready for the next cycle.