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+clc

+clear

+//Input data

+d=0.175;//The diameter of the bore in m

+pi=3.141;//The mathematical constant of pi

+L=0.32;//The length of the stroke in m

+p=6.5;//Mean effective pressure in bar

+pp=0.4;//Pumping loop mean effective pressure in bar

+N=510;//The speed of the engine in rpm

+pm=0.65;//Diagrams from the dead cycle give a mep in bar

+n=55;//Firing strokes per minute 

+

+//Calculations

+pmi=p-pp;//The net imep at full load in bar

+c=((N/2)-n);//Dead cycles per minute at no load 

+ipw=pmi*10^5*L*(pi/4)*d^2*(n/60)*(1/1000);//Indicating power for working cycles in kW

+Pp=pm*10^5*L*(pi/4)*d^2*(c/60)*(1/1000);//Pumping power of dead cycles in kW

+fp=ipw-Pp;//Power in kW

+fip=pmi*10^5*L*(pi/4)*d^2*(N/(2*60))*(1/1000);//Full load indicated power in kW

+fbp=fip-fp;//Full load break power in kW

+nm=(fbp/fip)*100;//Mechanical efficiency in percent 

+

+//Output 

+printf(' The full load break power = %3.2f kW \n The mechanical efficiency of the engine = %3.1f percent ',fbp,nm)