25 May '13, 11pm

2014 Chevrolet Impala 2.5-Liter Four-Cylinder: Quick Drive

2014 Chevrolet Impala 2.5-Liter Four-Cylinder: Quick Drive

That means that under light power demand, the valve doesn’t open as far, letting in only as much air is needed to combust the small amount of fuel required. That reduces so-called pumping losses, essentially the power required to pump extra air in and out of the cylinder. Under full power demand, the valve opens to its full extent to let in the maximum air required to match the high volume of fuel delivered into the combustion chamber.

Full article: http://www.greencarreports.com/news/1084370_2014-chevrole...

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