Pictured here is an animation showing the basic mechanics of how an internal combustion engine works. With support from the Energy Department, General Motors researchers developed a new technology -- the Intake Valve Lift Control -- that is helping save fuel and lower emissions in the 2014 Chevy Impala. As visualized in the closeup of the graphic, the Intake Valve Lift Control can operate at two different lift and duration modes -- only allowing the optimum amount of fuel and air mixture in the combustion chamber for the driving conditions. | Animated graphic by Sarah Gerrity, Energy Department.