The paper covers the mechanical and thermodynamic aspects of increasing the power output and thermal efficiency of an existing nonsupercharged two-cycle, loop-scavenged diesel engine through supercharging. The power output was increased by 40 per cent and the thermal efficiency by approximately 4 per cent. Much of the thermodynamic work was done on a UNIVAC computer and a brief description of the theoretical approach and results appear in this paper. Field test results from a Nordberg two-cycle, 21 1/2-in. × 31-in. supercharged engine are also included in this paper.

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