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  1. NBO

    Otto cycle efficiency

    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.
  2. NBO

    Otto cycle efficiency

    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.
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