This report describes the portion of the heavy-duty, diesel engine, baseline emissions program that was conducted at Southwest Research Institute. Initially, a facility was developed which was capable of complying with the requirements in the 1984 dynamometer transient test procedure. Nineteen diesel engines were then tested over the transient and the 13-mode emissions tests procedures. Two of these engines were retested for correlation purposes. Emissions measured were hydrocarbons, carbon monoxide, oxides of nitrogen, and particulate. Additional evaluations included: alternate fuels, alternate transient cycles, and particulate correlation tests.