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Run higher octane, squeeze more cutting power out of engine?

Discussion in 'Lawn Mowing' started by South Florida Lawns, Sep 21, 2005.

  1. South Florida Lawns

    South Florida Lawns LawnSite Platinum Member
    from usa
    Posts: 4,785

    If I up the octane from 87 to say 95, do you guys think I will notice a difference in engine performance? I was thinking it might be worth a try, but I don't want to waste money if I wont notice anything. I have 2 Toro Z-Masters 44'' and 19hp Kawi engine's, that bog down a little in thick grass when mulching.
  2. John Gamba

    John Gamba LawnSite Fanatic
    from ct
    Posts: 10,812

    Give it a shot with about a gallon of the good stuff.

  3. mowtech

    mowtech LawnSite Senior Member
    Posts: 252

    NO! Higher octane only means the fuel has a higher ignition temperature. It does not contain any more energy. High octane fuel is for high performance engines that have higher compression ratios and/or advanced ignition timing. Some electronic fuel injections systems will automatically advance the timing to the point of detonation to maximize power output. For these engines higher octane will make a difference. If you are not experiencing detonation or if the engine manufacturer does not specify high octane fuel, then you will just totally be wasting your money.
  4. South Florida Lawns

    South Florida Lawns LawnSite Platinum Member
    from usa
    Posts: 4,785

    thanks for clearing it up.
  5. Appalachian landscape

    Appalachian landscape LawnSite Senior Member
    Posts: 453

    topsites says he uses racing fuel
  6. nelbuts

    nelbuts LawnSite Bronze Member
    from SW, FL
    Posts: 1,053

    Ask yourself this important question. What does the manufacture recomend? Then use that. Honestly high octane fuel is overated. Consumer Report did a test and came up with that conclusion not me.
  7. br1dge

    br1dge LawnSite Member
    Posts: 49

    It si not overrated for engines that can take advasntage of their properties, as explained. Today, small engines do not fall into this category at all. 87 all the way!
  8. LB1234

    LB1234 LawnSite Gold Member
    Posts: 3,210

    Twisting the thread a little....sorry to the original poster...

    does anyone deal with 'oxygenated' gasoline during the cooler months. Thats what happens in jersey and I've noticed a 1/2-1 mpg less in fuel economy. Not sure if its just me being stupid or the weather or what. Anyone else notice the difference?
  9. lawnmaniac883

    lawnmaniac883 LawnSite Silver Member
    Posts: 2,613

    I get better fuel economy on my 17hp 44z gravely since I began running 89 octane. Engine seems to have more grunt to it. For an extra 10 cents, go for it and see how you like it. Some premature detonation is not noticed until it isnt there.
  10. Lake Claire Lawn Ranger

    Lake Claire Lawn Ranger LawnSite Member
    Posts: 242

    My engine had a tendency to keep running and sometimes backfire when I turned it off. I read in a post that it was due to deposits in the cylinder. I started running premium gas and now it operates as it should. Also seems to have a little more rpm but that may just be my imagination.

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