Specific Fuel Consumption
The amount of fuel needed to provide a given power for a given period.
|Otto Cycle||0.3 kg/kWh|
|Diesel Cycle||0.24 kg/kWh|
|Otto-Compound engine||0.23 kg/kWh|
|Turbocharged Diesel||0.23 kg/kWh|
|Turbocharged & Intercooled Diesel||0.22 kg/kWh|
|Diesel-Compound engine||0.21 kg/kWh|
The engine efficiency is the reciprocal of the product of the specific fuel consumption and the lower heating value of the fuel.
Thus where the SFC is given in kg/kWh:
- diesel engine efficiency = 1/(SFC x 11.9531)
- gasoline engine efficiency = 1/(SFC x 12.2225)