Mechanical efficiency has to do with how well machines convert energy from one form to another. For example, an internal combustion engine converts the chemical energy in fuel into power. Internal combustion engines are not 100% efficient because all the energy in fuel is not converted power (the majority of the heat produced escapes through the radiator and out the exhaust). A typical gasoline engine is about 22% efficient; a diesel engine is 30 to 33%. An electric motor converts electrical energy into power with an efficiency of 95 to 98%. The efficiency of mechanical power trains and other mechanical devices can be determined if accurate numbers for the power in and power out can be determined.
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