Regular, Super, or Premium Fuel? Thoughts?

Discussion in 'Motorized Bicycle General Discussion' started by Zoomie, Dec 11, 2010.

  1. Goat Herder

    Goat Herder Gutter Rider

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    The slant head may be an exception? Have you tried any of them, yet? We are both at similar altitudes. Also the said M.M. billet head is suggested for higher octane.
     
  2. Nashville Kat

    Nashville Kat Active Member

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    Yeah- isn't higher octane gas simply just more refined? Outside of any additives the oil companies may claim, isn't it sorta like carb cleaner and gas treatment distilate, just DISTILLED into a finer grade from crude oil?

    Doesn't that just mean that it's gas with less oil in it otherwise? and then here we are with out 2 strokes, ADDING oil to lubricate a motor with no crankcase otherwise.
    Doesn't make much sense to spend more for it-
    You probably have to add MORE oil to it then, and pay for that!

    correct me if I'm wrong but I don't think I am.

    P.S. I've been using distilate carb cleaner additives in my cars now for 30 years and I think they work great, especially in heavy cars with engines that aren't blown out a lot at high speeds.
     
  3. fishyfish777

    fishyfish777 New Member

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    I always guessed that these engines have such rubbish compression that they would be better off running off lower octane fuel. Isn't high octane fuel for engines with high compression or otherwise with forced injection (Which these motors are... neither)? All I hear is higher octane fuel is only gas that burns slower.
     
    #23 fishyfish777, Dec 12, 2010
    Last edited: Dec 12, 2010
  4. wayne z

    wayne z New Member

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    I used to work in oil refineries. All gasoline is refined first, then the octane and antiknock compounds are added AFTER refinment. They have special one lung test engines in the labs loaded with sensors ,called "knock engines" that they use to monitor additive results.

    I have also seen several different prominent brand names of tank trucks filling up from the same storage tanks.

    Wayne Z
     
  5. tim turbo

    tim turbo Member

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    I like the non oxygenated 93 octane unleaded, for the simple reason that its easier on rubber parts in the carb, and it do'es not gum up.
     
  6. skiball83

    skiball83 New Member

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    All gas comes up through the same pipeline from many different companies. Say shell puts in 50,000 gallons and bp puts in 50,000 gallons. They end up getting mixed together in the pipe. Only the grades of gas are seperated by huge plugs that get rammed in after the gas has been added i.e. regular, mid, and premium. When the gas reaches its destination then it goes to a specific company say shell will pull out 50,000 gallons of gas that they initially put in. Then that "mixed up" gas from 10 different oil companies that is now the property of shell puts in their own additives, then the gas goes to the stations. Thats how gas is shipped and the only difference is a companies specific additives. Now on to octane/grade. The higher the number the slower it will burn. The only time higher octane will make a differance is if you are running a really really old motor with a lot of miles, or a high compression/forced induction motor at a minimum of a 8.5:1 ratio. If you dont believe me look it up, this is all true. Run 87 or maybe 89 in your china girls. Anything over that is a waste of money. BTW all the china girl 2 stroke motors exept the superrat-66 run a 6:1 compression ratio. The superrat-66 is a 7:1.
     
    #26 skiball83, Dec 16, 2010
    Last edited: Dec 16, 2010
  7. breno

    breno New Member

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    I love my rat but I guess if your saying that the fuel burns slower when using the high octane fuel I guess it wouldnt be beneficial to run the 98octane going by what your saying.
    Is there any proof that the china motors will run worse on the higher octane fuel?
    Can someone post up a link? Maybe even a a few different dyno runs to compare solid figures..
     
  8. cigron

    cigron New Member

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    Octane is the number zero in latin.Octane rating is the means
    To measure the fuels ability to stand heat and presser before
    It explodes. The fuels ability to make power is measured in
    BTU`s. Using I higher octane then needed wont make it
    Run any better. But it won`t hurt any thing either.
     
  9. skiball83

    skiball83 New Member

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    I agree. Not gonna hurt (well maybe our china girl mufflers) but in some engines it may make LESS power.
     
  10. breno

    breno New Member

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    Octane rating is the means
    To measure the fuels ability to stand heat and presser before
    It explodes.

    In saying this the theory would be fuel not igniting quick enough without the higher Heat of Compression being present. It does make sense to me I'd just like to see if anyone in this wide world has any facts from a practical observation.
     
    #30 breno, Dec 16, 2010
    Last edited: Dec 16, 2010
  11. breno

    breno New Member

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    maybe I'll just button up and deal with it.. the theory is there I'll try the lower octane fuel for the next couple of tanks and post if I can feel any difference or the plug might change colour a tad interesting to see what happens anyway.
     
  12. skiball83

    skiball83 New Member

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    Give it a shot. I ran 89 at first then went ot 87 with no noticable differance. The only reason I ran 89 was because the oil bottle told me to, but then again our MB instructions tell us to run 16:1 oil mix.
     
  13. breno

    breno New Member

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    Aint that true I'm actually running my spare in on 20-1 fully synthetic and she still blows smoke..LOL
    Gone of the days with oil muck dripping out the zorst pipe when there ripe and ready its just a waste of oil IMO..
     
  14. Goat Herder

    Goat Herder Gutter Rider

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    I only mix a gallon of 2 smoke mix at a time and usually use it up in a week or so. This stuff has a very limited shelf life in my opinion.
     
    #34 Goat Herder, Dec 20, 2010
    Last edited: Dec 20, 2010
  15. Drewd

    Drewd New Member

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    I've been running 85 octane for the past 6 years with no problem. I once ran 87 octane but that was in the summer i spent in Florida (sea level)
     
  16. linnix13

    linnix13 Member

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    on all my stock HT's i run regular fuel, but on my current bike i use premium, and it does help. my current bike is full of mods and among them is a milled head, i have more compression and i find with regular it runs great at low rpms but as i climb up into 6000+ it stutters and pings and misses, not a big deal, but if i throw premium in it she runs up to 8000rpms without so much as a pop!
     
  17. thormxboy132

    thormxboy132 New Member

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    I can not see running a 91 fuel in a motor that only has a 6:1 ratio, but I would like to ask about ethanol, how menny people use it and how menny dont? I live in a area wheres theres a lot or recreational fuel pumps and I plan on using it ( non-ethanol) in my bike once its going. what are your thoughts?
     

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