MILFORD, MI – Showcasing its support for the continued development of gasoline engines, General Motors Corp. unveils a pair of prototype vehicles that blend spark-ignition (SI) and compression-ignition (CI) internal combustion technologies. Known as homogeneous charge compression ignition, or HCCI, the integrated engine concept blends the best attributes of gasoline and diesel mills and is considered a giant leap forward in gasoline-engine development, says Uwe Grebe, executive director-GM ...

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