The Honda CVCC engine uses the second

whatiscvcc2.jpgThere are two basic ways for simultaneously lessening the amount of carbon monoxide, un-burned hydrocarbons, and oxides of nitrogen in the exhaust of internal combustion engines: (1) Cleaning up the exhaust by means of a catalyst or other add-on devices, or (2) Employing a very lean overall mixture (excess oxygen) and regulating its combustion to suppress production of the unwanted pollutants. Conventional and rotary engines uses the first method. The Honda CVCC engine uses the second.

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