Abbreviation for brake horsepower. The brake horsepower of an engine is the effective power output, sometimes measured as the resistance a brake attached to the output shaft provides to an engine. See horsepower
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}