Home Forums Tech Talk Question for December

This topic contains 2 replies, has 3 voices, and was last updated by  Walt Gifford 4 years, 12 months ago.

  • Author
    Posts
  • #18089

    Jim Silverheels
    Participant

    Would anyone guess why a Rotax Max would use a fuel/oil ratio that is  about 1/2 what other engines use?

  • #18108

    Charles Kaneb
    Participant

    My short answer is that it has a coated piston and a plated bore.

    My longer answer is that they wanted less maintenance and lower emissions than other engines. Therefore, they chose a cleaner-burning synthetic oil, specified a lower oil-gas ratio to try to minimize buildup, and relied on the coatings to avoid seizure when lubrication conditions worked well.

    In my case at least it worked. I got 81 hours out of a Rotax piston on Gulf 93 and Motul synthetic. It’s probably the best part of the Rotax package.

  • #18146

    Walt Gifford
    Participant

    That’s it, it goes so long between maint they don’t want the carbon build up. You can run more oil if you want, I ran 32:1 for the short time I had mine.

    Gif

    FAA certified jet engine and aircraft technician,
    Nicholson Speedway class champion 2001,
    Yamaha KT100 Service Center,
    41 years karting experience

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