Air Snowmobile

student-constructed sae clean snowmobile @ imagine rit 2017.

most snowmobiles still powered two-stroke engines, although alpina , yamaha have been using four-strokes since 2002 , 2003, respectively. however, in last decade several manufacturers have been successful in designing less polluting motors, , putting of them in production. yamaha , arctic-cat first mass-produce four-stroke models, less polluting two-stroke machines. alpina offers 4-stroke efi engines equipped catalytic converter , dual oxygen-probe. bombardier s e-tec two-stroke motors emit 85% less pollutants previous carbureted 2-strokes. polaris has developed fuel-injection technology called cleanfire injection on 2 strokes. industry working on direct-injected clean 2 strokes better in terms of nox emissions.

independent researchers, undergraduates , graduate students participate in contests lessen impact of emissions snowmobiles. clean snow mobile challenge held yearly @ michigan technological university regrouping entries universities across united states , canada. of participants in recent years have been École polytechnique de montréal quasiturbine engine , students École de technologie supérieure of uqam less polluting two-stroke engine using e85 , direct injection.