13 Facts About Metric horsepower

Tax or fiscal Metric horsepower is a non-linear rating of a motor vehicle for tax purposes.

Tax Metric horsepower ratings were originally more or less directly related to the size of the engine; but as of 2000, many countries changed over to systems based on CO2 emissions, so are not directly comparable to older ratings.

Hydraulic Metric horsepower can represent the power available within hydraulic machinery, power through the down-hole nozzle of a drilling rig, or can be used to estimate the mechanical power needed to generate a known hydraulic flow rate.

One boiler Metric horsepower is equal to the thermal energy rate required to evaporate 34.

Term "boiler Metric horsepower" was originally developed at the Philadelphia Centennial Exhibition in 1876, where the best steam engines of that period were tested.

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Boiler Metric horsepower is still used to measure boiler output in industrial boiler engineering in the US.

Boiler Metric horsepower is abbreviated BHP, not to be confused with brake Metric horsepower, below, which is abbreviated BHP.

Taxable Metric horsepower does not reflect developed Metric horsepower; rather, it is a calculated figure based on the engine's bore size, number of cylinders, and a presumption of engine efficiency.

Since taxable Metric horsepower was computed based on bore and number of cylinders, not based on actual displacement, it gave rise to engines with "undersquare" dimensions, which tended to impose an artificially low limit on rotational speed, hampering the potential power output and efficiency of the engine.

Nominal Metric horsepower is an early 19th-century rule of thumb used to estimate the power of steam engines.

Brake Metric horsepower is the power measured using a brake type dynamometer at a specified location, such as the crankshaft, output shaft of the transmission, rear axle or rear wheels.

Shaft Metric horsepower is the power delivered to a propeller shaft, a turbine shaft, or to an output shaft of an automotive transmission.

Shaft Metric horsepower is a common rating for turboshaft and turboprop engines, industrial turbines, and some marine applications.