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Diesel engine performance and design characteristics are affected by applications. Understanding general performance characteristics and the relationship between engine system design and applications is important for diesel engine system design engineers. This paper is the Part 2 of a series of three companion papers (parts) addressing diesel engine applications (i.e., Part 1 - organization design and systems engineering; Part 2 - general performance characteristics; and Part 3 - operating and design characteristics of different applications). It illustrates important general characteristics with selected examples, and highlights key issues and commonalities of different applications that engine system design engineers need to know. Series design and multi-purpose design are summarized. Four core equations in an engine air system theory are proposed in order to reveal the parametric dependency of pumping-loss-related parameters.