A team of Massachusetts Institute of Technology researchers unveils a spark-ignition vehicle engine that can switch to spark-free combustion under certain driving conditions. The dual-mode engine produces greater fuel economy without an increase in unwanted emissions. The MIT team, which presented its research at the 2007 International Fuel and Lubricants Meeting, has devised a way to switch from a conventional gasoline engine’s sparkplug-initiated ignition to "homogeneous charge ...

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