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Diesel engine technology has progressed through various design and materials improvements as previously have other engine concepts. Present diesel engines exhibit excellent fuel economy and reliability, having increased in popularity for automotive transportation and encouraged new developments in aircraft diesels. Further developments are now on the horizon for advances in higher temperature operation, low friction potential, and extended durability through the use of ceramics in key component hardware. In the present paper the authors, on the basis of past and present experience, discuss applications for silicon carbide components and the relevance of associated developments in joining technology and non-destructive evaluation.