Steam Boilers, Engines, Nozzles and Turbines
Besides mean effective pressure, the data required to determine the indicated power of an engine include

Piston diameter, specific fuel consumption and Calorific value of fuel
Specific fuel consumption, speed of rotation and torque
Piston diameter, length of stroke and calorific value of fuel
Piston diameter, length of stroke and speed of rotation

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Steam Boilers, Engines, Nozzles and Turbines
The relative efficiency is defined as the

Ratio of thermal efficiency to Rankine efficiency
Product of thermal efficiency and Rankine efficiency
Ratio of heat equivalent to indicated power to the energy supplied in steam
Ratio of brake power to the indicated power

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