Here are some parameters that represent the performance of an internal combustion (IC) engine: Fuel-air ratio: A key parameter that affects horsepower and engine performance. Thermal efficiency: A desirable feature in fuel and energy-efficient IC engines. Brake horsepower (bhp): A practical measurement of power an engine delivers to the wheels or output shaft. Mechanical efficiency: The ratio between the brake work and indicated work. Specific fuel consumption: Related to the economic value of a machine. Specific output: Describes the efficiency of an engine in terms of the brake... Show more

Here are some parameters that represent the performance of an internal combustion (IC) engine:

Fuel-air ratio: A key parameter that affects horsepower and engine performance.
Thermal efficiency: A desirable feature in fuel and energy-efficient IC engines.
Brake horsepower (bhp): A practical measurement of power an engine delivers to the wheels or output shaft.
Mechanical efficiency: The ratio between the brake work and indicated work.
Specific fuel consumption: Related to the economic value of a machine.
Specific output: Describes the efficiency of an engine in terms of the brake horsepower it outputs relative to its displacement. 

Other parameters that represent the performance of an IC engine include:
Brake specific fuel consumption
Brake effective power
In-cylinder pressure
Heat release rate 

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