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We reported yesterday about the basic concept behind Homogeneous Charge Compression Ignition, but AutoWeek's got a more in-depth explanation of the various strengths of the idea, as well as the difficulties behind implementing the technology. One of the more interesting facts is that a group of researchers running HCCI combustion chambers on quartz-crystal observation cylinders have noted that the diesels can run for three hours before the cylinder walls require cleaning.

Green Cars with a Poof? [AutoWeek]

Will the Spark Plug Go the Way of the Dodo? [Internal]