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An adiabatic diesel engine concept for achieving high thermal efficiencies is presented in conjunction with a turbocompound system. Improved thermal efficiencies are achieved through elimination of an engine cooling water system and reduction of exhaust losses. The 'hot' adiabatic engine concept with insulated combustion chamber offers many other engine benefits besides high thermal efficiencies. Notable among these are: multi-fuel capability, weight, size, and potential cost advantages. This program is supported jointly by Cummins Engine Company and TARADCOM Warren, Michigan. Some of the technical difficulties and problems encountered when working with ceramic materials on the adiabatic engine are covered. Engine tribology is singled out as the next promising step in improving engine efficiency through friction reduction and improved durability. The above engine concepts should contribute greatly to the nation's conservation efforts. (Wassmann)