The two stroke engine was more popular than the four stroke with small engines. Now, due to rules and regulations, the two stroke motor is beginning to be faded out of the small engine world
To understand why the four stoke engine is fading out the two stroke engine we need to look at some of the issues that two stroke engines are causing. The price of gas has been constantly increasing over the years and right now one of the easiest ways to save money on gas is to operate a four-stroke engine. The two stroke was built so that it fires on every revolution. ... Small two stroke engines have been built with up to four cylinders, so you can imagine how much fuel is used on one of those engines especially when they are capable of revving at 8000 rpm. On the other hand a four-stroke engine only uses fuel on every other stroke for each piston. This is what makes the four-stroke more fuel efficient.
Not only are four stroke engines more fuel efficient but they are also less likely to require engine work than a two stroke. It all has to do with how the engine is lubricated. ... Senthil Deepak “The lubrication system of a two-stroke engine is different from that of a four-stroke engine. In two-stroke engines, oil is mixed with the fuel (to provide lubrication for moving surfaces such as piston skirt and roller bearings). ... ” (The Hindu, 2001) This method of lubrication doesn’t give the two stroke engine a very long life. If you are not familiar with how the two stroke engine is lubricated you can cause serious damage to the engine. ... If you don’t put enough oil in then your engine could seize together. It is also very easy to forget to mix the oil with the gas which can cause serious damage to the engine.
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