Engineering Explained

  • 2006 BMW Hydrogen 7

    Although hydrogen—and hydrogen fuel cells—could still play an important role in future transportation, even many hydrogen advocates will admit that hydrogen internal combustion probably won't. It certainly wasn’t always this way. About 15 years ago there was great hope in the idea of hydrogen internal combustion—essentially running engines not much different than gasoline ones on stores of the periodic table’s first element. BMW offered a version of the 2005-2007 BMW 7-Series, called the Hydrogen 7, with a 6.0-liter V-12 that could run on gasoline or hydrogen. It...

  • How a Reactivity Controlled Compression Ignition engine works
    Engineers find new ways to improve efficiency of gas engines: Engineering Explained

    Researchers claim their RCCI engine has hit 60 percent thermal efficiency on the test bench, which would represent about a 50 percent improvement over the best modern engines.

  • Will you use less fuel during engine braking or simply by coasting?
    Saving gas by lifting the pedal: engine braking vs coasting (video)

    The way a driver operates a car can produce very different fuel-economy numbers, and when driving downhill, two notable techniques come into play. The first is leaving the car in gear and using so-called engine braking to provide at least some deceleration. But many believe putting a car in neutral...

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