Engine Horsepower (\( EHP \)):

\[ EHP = \frac{BHP}{\xi_m} \]

Where:

• \( EHP \) is the engine horsepower, in horsepower (hp).
• \( BHP \) is the pump brake horsepower, in horsepower (hp).
• \( \xi_m \) is the engine efficiency, in decimal form (0.80 for diesel, 0.70 for gasoline).