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This paper discusses the Minnesota State University, Mankato Automotive Engineering Technology program's entry to the 2002 Clean Snowmobile Challenge. Included in this report are the snowmobile model chosen for modification, engine choice, modifications applied, methods used, and modification results affecting performance, emission control, noise reduction, production cost, durability, fuel efficiency, safety, and rider comfort. The MSU Mavericks devoted their main focus for the Clean Snowmobile Challenge 2002 to the comparison of a two-stroke cycle engine to a four-stroke cycle engine. A direct fuel-injected two-stroke cycle engine and a turbo-charged four-stroke cycle engine were selected and were subjected to extensive modifications and testing procedures. Each engine was tested for emissions, noise, and performance; these test results were used to determine the final entry design.

A student team from Minnesota State University, Mankato's Automotive Engineering Technology program entered the Clean Snowmobile Challenge 2000. A 1998 Polaris Indy Trail was converted to indirect fuel injection running on a computer controlled closed loop fuel system. Also chassis, exhaust, and hood design modifications were made. The snowmobile was designed to compete in eight events. These events included acceleration, emissions, hill climb, cold start, noise, fuel economy/range, handling/driveability, and static display. The snowmobile modifications involved every aspect of the snowmobile with special emphasis on emissions and noise. Laboratory testing led to the final design. This paper details the modifications and test results.