Billed as the Next Big Thing for the gasoline engine, Homogeneous Charge Compression Ignition (HCCI) allows for diesel-like operation wherein compression, not spark, combusts lean air/gasoline mixtures for big fuel-economy gains. At least, that’s the theory. Volatile and complex to manage, HCCI’s useful operating window—and efficiency improvements—is limited to low loads: idle or cruising on […]
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Mazda’s Gasoline Skyactiv-X SPCCI Engine Explained
