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.
The Volkswagen Group replaced their 1.6 and 2.0 litre gasoline engines in the late 2000s with the 1.4 TSI unit. It was launched at the 2005 Frankfurt Motor Show in a 125 kW (170 PS) version using both a turbocharger and a supercharger. Its fuel consumption was 5% lower than the previous 2.0 FSI, despite the increased horsepower throughout the revving range. Later the engine was sold in several versions from 122 to 180 PS, some of them with only the turbocharger.
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- Simister, John (February 2012). "Driven: Ford Focus 1.0 Ecoboost". Car Magazine. Retrieved 12 February 2012.