Engine Thermal Efficiency Calculator

Calculate how efficiently your engine converts fuel energy into useful mechanical power.

Brake Power (HP)

Fuel Flow Rate (lb/hr)

Fuel Type

Compression Ratio

Engine Type

Brake Thermal Efficiency

165.1%

Theoretical Maximum

61.0%

Relative Efficiency

270.8%

Actual / Theoretical

BSFC

0.083 lb/hp-hr

Fuel Energy Input

463k BTU/hr

Brake Power (Heat)

764k BTU/hr

Efficiency Rating

Exceptional - Modern high-efficiency diesel

Useful Work165.1%

Cooling System Loss-29.3%

Exhaust Loss-29.3%

Other Losses-6.5%