The typical liquid-cooled snowmobile and snowmobile usage patterns are defined. Estimation of the cooling load of a snowmobile in terms of the following three worst conditions is discussed: maximum cooling requirement, minimum available cooling, and maximum cooling deficiency. Laboratory methods and calculations are given for determining required engine horsepower for a given speed, and engine heat rejection to the water jacket. Design considerations are presented for radiators and splash heat exchangers. The cooling deficiency method is introduced as a means to determine the heat rejection rates of cooling system components in actual field conditions using minimum instrumentation. Quality assurance tests are listed to be performed after selection and installation of appropriate cooling system components. It is noted that the cost of the radiator and snow-splash system can range from 5% to 10% of the total snowmobile cost, with a weight penalty of about 4%. The liquid-cooled snowmobile engine is described in terms of its field success as a quieter, more stable, and easier to start engine at low temperatures as compared to an air-cooled engine with belt-driven axial flow fan.

  • Availability:
  • Supplemental Notes:
    • Presented at SAE Off-Highway Vehicle Meeting and Exposition, Milwaukee, Wisconsin, 11-14 September 1978.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Fields, S
  • Publication Date: 1978

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00399000
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 780735, HS-025 568U
  • Files: HSL, USDOT
  • Created Date: Aug 31 1985 12:00AM