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engine downsizing
Engine downsizing is the use of a smaller engine in a vehicle that provides the power of a larger engine, through the use of recent technologies. It is the result of car manufacturers attempting to provide more efficient vehicles. The term generally relates to traditional internal combustion engines powered by petrol or diesel.
Many manufacturers are reducing engine capacity and number of cylinders. By adding a boosting device (turbocharger or supercharger) and direct injection technology, they provide a powerful engine with similar performance to a much larger engine, but with much improved efficiency and reduced carbon emissions. A smaller engine is also often lighter, so the car can be lighter and therefore nimbler.
Some observers have not been convinced by manufacturer's claims that reducing engine size provides a more efficient car.
==Recent research and progress==
The University of Bath published research carried out by its Powertrain and Vehicle Research Centre which demonstrated that it is possible to reduce engine capacity by 60% and still achieve the torque curve of a modern, large-capacity naturally-aspirated engine, while encompassing the attributes necessary to employ such a concept in premium vehicles.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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