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THIS paper discusses the free-piston engine which is being investigated by Ford. The analytic method for calculating free-piston-gasifier thermodynamic performance over the complete operating range is discussed for the given limitations and conditions. Using these analytical methods, an automotive-size free-piston and matched turbine was designed, built, and tested.

THE Free-Piston Engine Program described in this paper was concerned with determining thermodynamic relationships of small, high-speed engines. The purpose was to establish proper engine geometry and mechanical design which could then be applied to developing larger automotive engines. The author outlines the problems encountered during the Program's beginnings: starting system, powerplant assembly, cooling system, and lubrication. The results indicated that the free-piston engine would be particularly applicable to the farm tractor. The author thinks that such a powerplant may equal or better the diesel engine in economy.