Thanks Hippie,
Combustion engine has 2 working fluids.
Before combustion: k1=Cp1/Cv1
After combustion: k2=Cp2/Cv2
and k1 is not equal to k2.
Which one should I use for efficiency calculation?
Thanks.
The efficiency of the Otto cycle was descibed in many papers and could be expressed as 1-1/CR^(k-1). Could somebody help me with explanation what k is? We have 2 gases: before and after combustion and k is different.