av gas in mower

Discussion in 'Lawn Mowing' started by s and s mowing, Oct 14, 2004.

  1. s and s mowing

    s and s mowing LawnSite Member
    from ky
    Messages: 241

    anybody ever hear of running avaiton gas in a mower,was at dealer yesterday and he told me the local airport brought there ztr in for service and it has been run on av gas only,he said pipe was clean as he had ever seen and engine had several hundred hours on it and was in great shape.thinking of trying a few gallon in my exmark kohler,what ya think?
  2. Flex-Deck

    Flex-Deck LawnSite Silver Member
    Messages: 2,845

    av gas can be a bit dry - mighty high octane - probably 100 or better. I think you are better off with premium -about 92 octane. I have read or heard you do not want ethanol in small engines, and that may or may not be true, so I just use amoco premium. Just my opinion. Thanks, Brad
  3. DGI

    DGI LawnSite Member
    from SE Mich
    Messages: 173

    Expensive and unnecessary!

    Maximum efficiency is achieved by running the lowest octane possible. Octane is only a measurement of resistance to detonation
  4. Metro Lawn

    Metro Lawn LawnSite Silver Member
    Messages: 2,116

    Stay away from the AV gas. They must have been running low grade because the good stuff is about 130 octane, enough to melt your engine down
  5. cantoo

    cantoo LawnSite Silver Member
    Messages: 2,910

    You might want to get the pricing of av fuel first.
  6. DennisF

    DennisF LawnSite Bronze Member
    from Florida
    Messages: 1,381

    AV gas will cause air cooled engines to run hotter. Heat destroys moving parts quickly. Enough said.
  7. Albemarle Lawn

    Albemarle Lawn LawnSite Bronze Member
    Messages: 1,544

    You don't need it your compression is low enough to run 87.
  8. geogunn

    geogunn LawnSite Gold Member
    from TN
    Messages: 3,010

    not that I personally care, but AV fuel is not legal to use for non AV purposes.

  9. all degree

    all degree LawnSite Senior Member
    Messages: 344

    Wrong Geo. (and this is the business i am in) Its sold in many markets at the pump along with regular grades for the consumer. Most popular use is jet ski's and high performance boats.

    The comments about mowers are right on. AV gas is not good for small engines and will make them run extremely hot. Anything higher than 87 in a mower and you are just wasting money.
  10. Hizoot

    Hizoot LawnSite Member
    Messages: 15

    I dont know where some of you guys are getting your information. I run Vp C-12 in my KTM dirtbike and have been using some form of race gas in my bikes for 30+years. Race gas does not make your engine run hotter..as a matter of fact, the flashpoint of race gas is much lower than regular/ supreme unleaded. It burns cooler...which is why it will not make as much power or be as efficient ( quicker to burn, but not as hot burning) as regular unleaded in a low compression engine. Its advantage is for high compression engines that need cooler burning fuel and a low flashpoint to avoid detonation. Run the lowest octane your engine will survive and not detonate on. Anything more is a waste.
    There are more than a couple of grades of av gas as well. But all have modifiers , additives, and stabilizers for high altitude (icing) conditions. I have never run avgas, know some guys that have and I've heard totally different opinions on it. This might be due to the different formulas of avgas , engine compression, etc.

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