The common wisdom that rotary (Wankel) automotive engines are inherently high pollution emitters may soon come to an end — along with other rotary myths. Mazda Motor Corp. executives now are quietly hinting that the automaker's new iteration of the engine — to be unveiled this fall in Tokyo — will meet the toughest emissions regulations. This has industry engine engineers wondering how its low emissions are achieved. Part of the answer was no doubt revealed in 1995 by SAE paper #950454, ...

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