Iowa State Clean Snowmobile Challenge

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Presentation transcript:

Iowa State Clean Snowmobile Challenge 2017

Overview Snowmobile Selection Traction Sound Exhaust Tuning Oil Selection

Snowmobile Selection 2015 Polaris 600 Rush Pro-X Trail rider Engine displacement Handling Reliability 600 Liberty

Traction 120 x 1.25” Ripsaw II Track 1.325” 60˚ carbide tip Gold Digger studs 84 single pattern Reduced to 42 for weight minimization

Sound Two primary materials tested Analyzed at 3 frequencies Linex (1/16” and 1/8”) Raam Matting Ensolite foam tested as a complementary treatment Analyzed at 3 frequencies 1000 hz (High) 600 hz (Mid) 200 hz (Low) 1/8” Linex with Ensolite Foam chosen High- 93.5 Dba Mid- 84.7 Dba Low- 75.6 Dba

Sound High- 93.5 Dba Mid- 84.7 Dba Low- 75.6 Dba

Exhaust Destructive interference Chosen over an absorptive muffler Reduce sound pressure levels Chosen over an absorptive muffler Flow simulation conducted Ensure proper flow Validate exhaust gas velocity Reactive is more restrictive, but still is able to reduce sound levels To run the flow simulation we calculated the theoretical mass flow rate by using engine displacement, engine RPM, and volumetric efficiency of 65% - two stroke.

Emissions Implemented 2 catalysts 3-way catalysts 200 cells per square inch Palladium and Rhodium coating filters out HC CO NOx Lean Tune Oxidize HC and CO Main emissions harmful to environment.

Tuning Hardware Power Commander V Zeithronix Ethanol Analyzer NGK Afr Gauge

Tuning Strategy Perfect stoich - 1.00 Lambda Idle/Cruise - 1.08 Lambda WOT (wide open throttle) - 0.87 Lambda

Oils Carbon Monoxide Hydrocarbon

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