09/06/2008 05:12 am ET Updated May 25, 2011

5 Technologies That Improve Internal Combustion Engines

5 Fuel-Saving Technologies
In the long run, the internal combustion engine (ICE) is on the way out and electric motors are on the way in, but ICEs have been around for so loooong that we should be careful about announcing their demise. They're going to stick around a while longer, and so it's very important to make them as efficient and clean as possible.

Car and Driver looks at 5 fuel-saving technologies that are keeping the ICE relevant (if far from ideal). As they say, they still work on basically the same principle as they ever did, but old 4-cylinder engines produced about 20 horsepower while modern ones can generate up to 250 hp while being cleaner and burning less gas. Read on for more details on the 5 fuel-saving technologies: Clean diesel, direct injection, cylinder deactivation, turbochargers, and variable valve timing and lift.

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