What does engine horsepower mean?

[Oliver]

Engine horsepower refers to the output capacity (work done) of the engine, which is the output power. Output power is the most important parameter for measuring vehicle performance and is used to evaluate engine performance. Horsepower, torque, and rotational speed are essentially three interrelated parameters. Additional information: 1. Horsepower is a commonly used unit of power measurement in engineering. It generally refers to metric horsepower rather than imperial horsepower. 2. Metric horsepower is a value very close to imperial horsepower. It is defined as the work required to lift 75 kilograms-force·meters in one second. That is: 1 metric horsepower = 75 kilograms-force·meters/second = 735 watts. 3. Some countries such as the United Kingdom and the United States use imperial horsepower. 1 imperial horsepower equals 550 foot-pounds/second, which is equivalent to 745.7 watts. In the late 18th century, British physicist James Watt (1736-1819) defined horsepower as the work required to lift 1000 pounds by 33 feet in one minute to measure the power of newly manufactured steam engines. This is imperial horsepower, represented by the letter HP.