shows the gas flow requirement of a gas engine in norm conditions at full load. where: is the gas flow in norm conditions is the engine power is the mechanical efficiency LHV is the Low Heating Value of the gas Gallery of historic gas engines See also Autogas CHP Directive Cogeneration Gas turbine History of the internal combustion engine List of natural gas vehicles Anson Engine Museum References External links Crossley Gas Engine Antique Stationary Engines Old Engines Gas Engine Articles Gas Engine Magazine — An internal combustion historical magazine Engines Stationary engines Internal combustion piston engines