Why two stroke engines are banned whereas they give more power than the four stroke engines

Technically, two stroke engines complete its one power stoke in each revolution of crank shaft and four stroke engine complete one power stroke in every two revolution. That means the two stroke engine produces more power than the four stroke engine as per crankshaft moves. Two-stroke engines have the potential to produce  twice power of  same size four stoke engines  because there are twice as many power strokes per revolution. Two-stroke engines do not have valves which simplify their construction, Two-stroke engines are lighter, and cost less to manufactures compare to four stoke engines

However four stoke engines are mostly used in automobiles other than the two stoke engine. Its just because of some advantages of four stroke engine over two stoke engines. The main reason the two stroke engines are eliminated from automobiles is pollution .Yes pollution is major factor, because two stroke engines produce the more pollution as compare to four stroke engines. As we all know the exhaust gases produced by automobile is also a big factor in polluting the environment. The exhaust gases produced by engines are hydrocarbons, carbon monoxide, NOx_, carbon dioxides. Exhaust of hydrocarbons was excess from the two stroke engines. They are not successful in variable speeds in high speeds they produce very much mount of unborn fuels which is very harmful for everybody living in environment.

There are some other points also like fuel consumption, thermal efficiency ,maintenance  , noise ,cooling are responsible for twilight of two stroke engines. Because of high heat release, cooling of two stroke engines is also a big challenge. It also consumes more coolant and lubrication oils . because power stoke in every revolution of crank shaft  ,very less time is left for cooling of engine. Very less time is there for escape of exhaust gases that’s why it produces more noise.

Because of less moving parts in two stoke engine there are less mechanical and thermal losses as compare to four stoke engines. If theoretically we think less moving parts are there so less maintenance is require to two stroke engines. But practically more maintenance is require to two stoke engine because of high amount of heat release which affect all the other systems of the engine.

Two stroke engines have more disadvantages over advantages. so they are completely eliminated from automobiles . Because of environmental concern so many ultimatum are given by governments to Ban it.