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A previous paper (1)* described the performance improvements which can be obtained by using an “adiabatic” (uncooled) engine for military trucks. The fuel economy improved 16% to 37% (depending upon the duty cycle) and was documented by dynamometer testing and vehicle testing and affirmed by vehicle simulation. The purpose of this paper is to document a NATO cycle 400 hour durability test which was performed on the same model adiabatic engine. The test results showed that the engine has excellent durability, low lubricating oil consumption and minimal deposits.

The contemporary turbocharged aftercooled diesel engine is providing the world with one of the most efficient and dependable powerplants known to mankind. An adiabatic turbocompound diesel engine is analyzed in this paper to demonstrate that the contemporary diesel cycle without a cooling system could be the beginning of a new era in continued diesel engine efficiency, reliability and durability. The problems with the diesel cooling system encountered in service are presented. The consequence of an adiabatic turbocompound engine without any cooling system is treated for engine performance.