Clean Snowmobile Challenge Muffler

The goal of this project is to design a muffler that significantly reduces emissions and noise output compared to the stock muffler without noticeably reducing engine performance or increasing weight. We must have a fully assembled muffler before the Clean Snowmobile Competition, held in March. The muffler must be tested pre-competition with relative data that can be presented in the team’s technical paper and presentation.

Background
For the past 15 years, the University of Idaho has had a team compete in the SAE Clean Snowmobile Challenge. This challenge is based on making modifications to stock snowmobiles in order to reduce noise and emissions while increasing fuel economy, so that the snowmobile industry has less effects on the environment. This year, the UI CSC senior design team will be re-designing the muffler on the snowmobile in order to further address two aspects of the competition - Noise and Emissions.

Deliverables

 * Background research on various sound reduction technologies
 * CAD models and flow simulations of different sound reducing technologies and their effects on backpressure
 * Assembled muffler

Final Design


The final design (shown above)...