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Efficiency And Pollution Issues
Jan 20, 2018

It's also often true that the smaller, faster engines are more prone to pollution and inefficiency. At the lowest point of travel of the piston when the chamber is filling with fuel and air, the exhaust port often allows some fuel to escape the chamber. This is easily seen with an outboard motorboat, for example; people who look carefully are often able to see a multicolored oil slick surrounding the engine. As a result, these sorts of engines are usually considered more inefficient, and are sometimes also cited for environmental pollution. Although four stroke models are heavier and slower, they usually do a better job of making full use of fuel.

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