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2-Stroke Engine Oils: 5 Fast Facts

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Fact #1. The term stroke refers to the movement of the piston. Each time the piston moves in a particular direction, it's called a stroke. Two-stroke engines are much simpler than their four-stroke counterparts. In a two-stroke, the piston moves two times per power cycle. One of these strokes is the compression stroke and the other is the combustion stroke.
Fact #2. The reason a two-stroke engine only requires two strokes is because the combustion stroke and the beginning of the compression stroke happen simultaneously. This is along with the intake and exhaust functions. As the piston moves upwards, it also exposes the intake port and draws a new air-fuel mixture into the crankcase. When it moves downwards, it opens the exhaust port, expelling the spent air-fuel mixture.
Fact #3. Two-stroke engines have some considerable advantage over four-stroke engines. They also have some notable disadvantages, as well. Their simplistic design and construction makes them cheaper to manufacture and fix. They don't have any valves, instead making use of inlet and outlet ports. Therefore, there are less components that could potentially break.
Fact #4. It isn't all roses when it comes to two-stroke engines. They are less fuel efficient, since fuel gets consumed every other stroke. Unconsumed fuel can also sometimes escape through the exhaust port. They create more pollution, as well. This is because the combustion of oil produces more smoke than the combustion of fuel. Users have to add oil to their fuel tank every time they refuel, which can get expensive.
Fact #5. When it comes time to buy oil for your two-stroke engine, you may notice there are a few different types available. The most prominent of these are mineral, semi-synthetic, and synthetic. Each of these has different characteristics. The prices between them vary wildly.
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