Brake Specific Fuel Consumption - Examples of Values of BSFC For Shaft Engines

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%

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