//speed of the engine(in rpm)
N=2000;
//brake power of the engine(in kW)
bp=60;
//brake thermal efficiency
nbth=0.3
//calorific value of fuel(in kJ/kg)
CV=42000
//bore of engine(in m)
d=0.12
//stroke length(in m)
L=0.1
//density of air(in kg/m^3)
Da=1.15
//air fuel ratio
Raf=15
//mechanical efficiency
nm=0.8