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The University of Idaho's entry into the 2006 SAE Clean Snowmobile Challenge (CSC) was a second-generation gasoline direct-injection (GDI) two-stroke powered snowmobile. A modulated and battery-less direct-injection system was used to decrease exhaust emissions and improve fuel economy without reducing the power output of the engine. The team added a reduction catalyst designed for a two-stroke to the exhaust silencer to further reduce exhaust emissions and noise. Under-hood noise was targeted by using sound absorbing materials and a sealed hood. Chassis noise was addressed by using a spray-on rubberized material that absorbs vibrations transferred through the chassis. The snowmobile entered into the 2006 SAE CSC competition was lightweight, easy-to-ride, powerful, fuel efficient, and had reduced exhaust emissions.

The University of Idaho's (UI's) entry into the 2007 SAE Clean Snowmobile Challenge (CSC) was a third-generation gasoline direct-injection (GDI) two-stroke powered snowmobile. The modulated and battery-less direct-injection system fully met the competition goals of “improved emissions and noise while maintaining or improving the performance characteristics of the original snowmobile.” The students designed and manufactured a new head for a stock two-stroke 600cc snowmobile engine. The head was designed to use direct fuel injection to control fuel quantity and timing to reduce fuel short-circuiting. Performance was refined through the use of precise engine mapping. The emissions output was further reduced by a reduction catalyst located in the exhaust silencer. Noise from the engine compartment was reduced by using sound absorbing materials and a sealed hood. The UICSC team consisted of students from freshmen through graduate students.