The methodology developed in Part 1 of this investigation (Riggins, D. W., McClinton, C. R., and Vitt, P. H., ‘‘Thrust Losses in Hypersonic Engines Part 1: Methodology,’’ Journal of Propulsion and Power, Vol. 13, No. 2, 1997, pp. 281 – 287) for the identi cation and evaluation of the thrust losses in a scramjet engine is applied to one-dimensional scramjet engine ows with coupled loss mechanisms. Thrust and thrust potential losses are related directly to increases in irreversible entropy caused by friction, heat transfer, mixing, nonequilibrium reaction, and shocks. This method is extended to enable the evaluation of thrust losses in multidimensional ows. The fundamental relationship between performance assessment utilizing multidimensional ow elds and cycle analysis performance prediction is shown and discussed.