Kerja bersih (Wnet) Wnet = WT - WP Nisbah kerja (Work Ratio) WT / WP Nisbah udara/bahanapi (Air/Fuel Ratio) ma / mf Haba bekalan (Q supply) Q supply = m x Cpg (T3 –T2) Kecekapan haba loji (ŋ TH) ŋ TH = Wnet / Q supply 53