Engine Efficiency

For thermal engines this is the relationship between the total energy contained in the fuel, and the amount of energy used to perform useful work.

Brake Thermal Efficiency

The ratio Brake Power to Heat of Fuel.

Mechanical Efficiency

The mechanical efficiency takes into account friction losses in the bearings, piston sliding losses and valvetrain losses. The ratio of Brake Power to Indicated Power is the mechanical efficiency.

Power Lost to Friction

This can be calculated from the difference between Indicated Power and Brake Power.


See also: Brake Power, Brake Thermal Efficiency, Engine Mechanical Efficiency, Engine Tuning to Reduce Fuel Consumption, Indicated Power, Internal Combustion Engine, Power Lost to Engine Friction.

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Subjects: Mechanical Engineering