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What octane should be running 2002 Ski Nautique Ford 351

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  • What octane should be running 2002 Ski Nautique Ford 351

    Iím sorry if this a repeat question in this forum. I canít find a solid answer. I simple yes or no will be fine. 1. Should I run the 87 octane with 10 percent ethanol?

    2. Or, should I run the 91 octane with no ethanol?

    Signed,

    Feeling dumb.

  • charlesml3
    replied
    Originally posted by Wake.BC View Post

    If I had the 575 I would definitely run 91 which it calls for but with the 440 89 is fine so thatís what I run....


    Sent from my iPhone using PLT Nautique
    Yea. Higher compression engines (especially those with forced-induction) are what high-octane fuel is all about. The octane helps eliminate pre-ignition or "spark knock" as it's usually called. If you have to run a lower octane fuel in one of these engines, the ECU will detune the engine to eliminate the pre-ignition (with a corresponding reduction in HP/torque). On the other hand, running a high-octane fuel in an engine that doesn't need it won't do the opposite. In other words, it cannot "tune up" to take advantage of the higher octane.

    Leave a comment:


  • Wake.BC
    replied
    Originally posted by charlesml3 View Post

    There are a lot of myths around high-octane fuel such as:

    - It'll last longer in a gas can or in your gas tank.

    - It cleans your injectors

    - It'll let the engine create more horsepower/torque (only true if the engine can tune itself for higher octane fuel).

    - It'll make your engine last longer.

    - 93 Octane fuel is better than 89 which is better than 87.
    If I had the 575 I would definitely run 91 which it calls for but with the 440 89 is fine so thatís what I run....


    Sent from my iPhone using PLT Nautique

    Leave a comment:


  • charlesml3
    replied
    Originally posted by Wake.BC View Post
    Coming from an indmar guy I think these high octanes are crazy. Just do what your manual tells you and everything should be fine. Even my dealer was like yeah... just run 89


    Sent from my iPhone using PLT Nautique
    There are a lot of myths around high-octane fuel such as:

    - It'll last longer in a gas can or in your gas tank.

    - It cleans your injectors

    - It'll let the engine create more horsepower/torque (only true if the engine can tune itself for higher octane fuel).

    - It'll make your engine last longer.

    - 93 Octane fuel is better than 89 which is better than 87.

    Leave a comment:


  • Wake.BC
    replied
    Coming from an indmar guy I think these high octanes are crazy. Just do what your manual tells you and everything should be fine. Even my dealer was like yeah... just run 89


    Sent from my iPhone using PLT Nautique

    Leave a comment:


  • charlesml3
    replied
    Originally posted by Nautiquehunter View Post
    I must be the luckiest guy in the world. I have 5 boats all run on the cheapest 10% ethanol gas I can find. My 08 has over 1000 hours no problems yet?
    Ha! ha! Actually, you probably understand the realities around Octane and Ethanol...

    It's amazing how in 2018 there is still so much myth around this.

    -Charles

    Leave a comment:


  • Nautiquehunter
    replied
    I must be the luckiest guy in the world. I have 5 boats all run on the cheapest 10% ethanol gas I can find. My 08 has over 1000 hours no problems yet?

    Leave a comment:


  • SatherG230
    replied
    The Stabil Marine is good stuff. Stay away from the regular Stabol (red label). My local small engine guy says that is what keeps him in business! Seafoam is also a good additive. If you have to run ethanol, Star-tron enzyme treatment is also good to use.

    Leave a comment:


  • CHassmann
    replied
    I can't get fuel in my area that does not contain alcohol for my '02. If I were in your shoes, I would definitely choose the 91 octane without ethanol. I normally use 89 with sta-bil 360 Marine ethanol fuel treatment. I occasionally run higher octane or use fuel injector cleaner.

    Leave a comment:


  • SatherG230
    replied
    If you want to avoid problems, use premium non-oxygenated fuel. 91 octane W/o ethanol. Fuel tends to sit in boats for a while. Ethanol absorbs moisture.
    Premium stays fresher longer. That especially goes for small engines

    Leave a comment:


  • JayG80
    replied
    "Use any good grade of automotive regular or premium gasoline with a minimum average octane rating of 89. An 87 average octane gasoline can be used if 89 octane is not available" quote from Manual page 8.10 that happened to be on my desk ;-)

    Leave a comment:

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