To meet tough automotive competition and stringent government regulations, more efficient engine components, improved engine oils, and high performance coating materials have been developed within the automotive industry.
Energy conservation and efficiency have always been the quest of engineers concerned with internal combustion engines. Even the diesel engine rejects about two thirds of the heat energy of the fuel, one-third to the coolant, and one third to the exhaust, leaving only about one-third as useful power output. Theoretically if the heat rejected could be reduced, then the thermal efficiency would be improved, at least up to the limit set by the second law of thermodynamics. Low Heat Rejection (LHR) engines aim to do this by reducing the heat lost to the coolant. The diesel engine with its combustion chamber walls insulated by ceramics is referred to as LHR engine Thermal barrier coatings (TBC) are used to improve reliability and durability of hot section metal components and enhance engine performance and efficiency in diesel engines. Because the combustion chamber temperatures of ceramic-coated engines are higher than those of uncoated engines, it may be possible to use a fuel with a large distillation range and lower-quality fuels.
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