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The ECTAM (External Combustion Thermal Amplification Motor) is a new engine, designed from the ground up to meet the performance needs of Hybrid Electric Vehicles and low emissions goals for future transportation. The basic design incorporates a positive displacement pinned vane rotary compressor supplying a combustion chamber with pressurized air. The air combines with fuel in the combustion phase and is ported to the positive displacement pinned vane rotary expander. In the expander the working gas pressure drops as a function of the rotative blade position. Four out of eight blades are continuously performing work as a function of the differential pressure on each respective blade. Exhaust manifold and engine housing heat energy is used to create pressurized steam which is used in cooling the continuous combustion process. This augmented steam is then mixed with the constituents of combustion and is used as a component of the working fluid which is provided to the expander.