The objective was to develop a generalized computer model of a Rankine-cycle automotive propulsion system to be used for the analysis of propulsion system dynamics. Digital computer models were developed for the following propulsion system components: working fluid--water and organic; combustor; vapor generator; expander--reciprocating and turbine; condenser; regenerator; feedpump; and controls. Other vehicle system models which were developed to permit analysis of engine dynamics during realistic driving transients include: transmission; vehicle motion; route mission profiles; and driver. A module-linkage approach was employed. Linkage of the information signals forms a total system model which can be employed for transient analysis of the entire propulsion system. The derivation of the models and their application to specific designs are included. Steady-state and transient results are presented.