Highest horsepower?

Highest horsepower?

• A. Brake horsepower
• B. Shaft horsepower
• C. Brake mean effective horsepower
• D. Indicated horsepower

Answer: (D)

Indicated horsepower is the highest because it represents the power produced inside the engine cylinders by combustion, without subtracting any losses. It’s the theoretical power the engine could deliver if there were no friction, pumping, or accessory losses. Brake horsepower removes those internal engine losses to show the usable power at the crankshaft, shaft horsepower goes further to account for losses in the shaft, gears, and drivetrain, and brake mean effective horsepower is essentially tied to the brake (after losses) side. So the raw power from combustion (indicated horsepower) sits above all the others.

Indicated horsepower is the highest because it represents the power produced inside the engine cylinders by combustion, without subtracting any losses. It’s the theoretical power the engine could deliver if there were no friction, pumping, or accessory losses. Brake horsepower removes those internal engine losses to show the usable power at the crankshaft, shaft horsepower goes further to account for losses in the shaft, gears, and drivetrain, and brake mean effective horsepower is essentially tied to the brake (after losses) side. So the raw power from combustion (indicated horsepower) sits above all the others.