In low-speed large diesel engines, low-grade or heavy petroleum fuels have long been used as an economy measure. Efficient use of various low-grade fuels has recently become a topic of great concern also for high-speed small diesel engines. This paper describes and analyzes improvements of the thermal efficiency and smoke emissions by fuel heating and blending with low-viscosity fuels in high-speed diesel engines with a range of low-grade or high-viscosity fuels.

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