Examples of Values of BSFC For Shaft Engines
The following table takes selected values as an example for the minimum specific fuel consumption of several types of engine.
Turboprop (aircraft engine) values are given for the complete range of power during a flight.
Ground roll SFC value (at 0.07 Pmax) and especially idle (at rest) SFC values show dramatic increases when compared with cruise value (0.70 Pmax).
For specific engines values can and often do differ from the table values shown below. For comparison, the theoretical work that can be derived from burning octane (C8H18) (based on change in Gibbs free energy going to gaseous H2O and CO2) is 45.7 MJ/kg, corresponding to 79 g/(kW·h).
| Power | year | Engine type | Application | SFC in lb/(hp·h) | SFC in g/(kW·h) | Energy efficiency |
|---|---|---|---|---|---|---|
| 2020 kW | 1996 | Pratt & Whitney turboprop PW127 | aircraft engine at idle | 2390 | ||
| PW127 | aircraft engine at ground roll | 1270 | ||||
| PW127 | aircraft engine @ 0.30 Pmax | 508 | ||||
| PW127 | aircraft engine @ 0.70 Pmax | 328 | ||||
| PW127 | aircraft engine at Pmax | 294 | ||||
| Turbo-prop | 0.8 | 360 to 490 | 17 to 23% | |||
| 30 kW/litre | 2012 | Scuderi Engine gasoline split cycle naturally aspirated two stroke | Simulation of prototype engine | 269 | ||
| Otto cycle gasoline engines | .45 to .37 | 273 to 227 | 30 to 36% | |||
| 80 kW/litre | 2011 | Ford Ecoboost Downsized turbocharged otto engine | automobile engine | 245 | ||
| 2000 kW | 1945 | Wright R-3350 Duplex-Cyclone gasoline turbo-compound | aircraft engine | 0.4 | 243 | 33.7% |
| 75 kW/litre | 2012 | Scuderi Engine gasoline turbo-charged split cycle two stroke | Simulation of prototype engine | 233 | ||
| 57 kW | Toyota Prius THS II engine only | automobile | 225 | 37% | ||
| 68 kW | 2008 | Revetec Controlled Combustion Engine gasoline engine | automobile | 212 | 38.6% | |
| 550 kW | 1931 | Junkers Jumo 204 turbocharged two-stroke diesel | aircraft engine | 210 | 39.8% | |
| 36 MW | 2002 | Rolls-Royce Marine Trent turboshaft | marine engine | 210 | 39.8% | |
| 2013 kW | 1940 | Klöckner-Humboldt-Deutz DZ 710 Diesel two stroke | aircraft engine | 0.33 | 201 | |
| 2340 kW | 1949 | Napier Nomad Diesel-compound | aircraft engine | 0.345 | 210 | 39.8% |
| Diesel engine turbocharged diesels | .34 to .30 | 209 to 178 | 40 to 47% | |||
| 165 kW | 2000 | Volkswagen 3.3 V8 TDI | automobile engine | 0.33 | 205 | 41.1% |
| 43 MW | General Electric LM6000 turboshaft | marine engine, power generation | 199 | 42% | ||
| 88 kW | 1990 | Audi 2.5 litre TDI | automobile engine | 198 | 42.5% | |
| 80 MW | 1998 | Wärtsilä-Sulzer RTA96-C two-stroke | marine engine | 163 | 51.7% | |
| 23 MW | MAN Diesel S80ME-C Mk7 two-stroke | marine engine | 155 | 54.4% |
Read more about this topic: Brake Specific Fuel Consumption
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