How Catalytic Converters Work

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How Coal Rollers Work

How Coal Rollers Work

Coal rollers create plumes of black smoke by forcing more fuel into a diesel engine than it can handle. Learn about coal rolling at HowStuffWorks.


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  • Barringer, Felicity; A Greener Way to Cut the Grass Runs Afoul of a Powerful Lobby. New York Times
  • Kanellos, Michael; Gold to go in diesel engines. CNET News.com
  • www.chemicool.com
  • www.innovations-report.com