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The regenerated diesel engine offers the substantial performance advantages that are thermodynamically available when thermal regeneration is applied to a reciprocating internal combustion engine. This paper describes this new form of reciprocating engine and provides an update of the results of feasibility studies and development efforts now in progress. This regenerated engine R&D is being accomplished under a jointly funded, integrated effort involving the US Navy, Caterpillar Inc., the ReJen Co., NASA, and Ultramet Inc. This paper describes only the R&D efforts performed at ReJen and Ultramet.