Octane Ratings

Discussion in '2-Stroke Engines' started by bornagain, Nov 5, 2007.

  1. bornagain

    bornagain Guest

    So I have bought a 48cc STARFIRE GENERATION II BICYCLE ENGINE KIT.

    Here in England we have 95 ron to 98 ron.
    Shell do the V-power 98 ron, would this be ok to use with these happy day engines?
    Or is the octane level to high?
    Also will using top quality 2 stroke racing oil be ok?

    Thanks
     
    Last edited by a moderator: Nov 5, 2007

  2. noendo

    noendo Guest

    just searching for info on this kit as im from the uk to. where did you buy yours from?
    and have you installed it yet?
    my biggest concern is noise and would love to get some feedback before i buy.
     
  3. bornagain

    bornagain Guest

    I would invest in a Golden eagle bike engine, these frame mounted ones are awful................dirty..........and so on.
     
  4. Gimmick

    Gimmick Guest

    the compression ratio on Chinese engines is about 6.6:1 and so the compression is not high enough to warrant the use of a high octane fuel. As for the oil, I recommend Bel-ray H1r, but ant good motorcycle specific 2 stroke oil will do.
     
  5. but using high octane fuel such as 91 would not make it run improperly due to higher knock resistance(i guess means that it burns slower)/
     
  6. Gimmick

    Gimmick Guest

    most likely, it will not lead to improper operation. What I found was this. On cold weather starts, 85 octane worked better than 90> octane. Other than that the extra .60 cents a gallon is hardly a factor at 84 mpg.
     
  7. Herrmanator8

    Herrmanator8 Guest

    just to throw in, i live in the U.S. so im not sure on what they serve as gas in the uk but i know that 93 octane fuel compares to regular unleaded fuel here and 84 is considered low grade. regular is recommended for these engines and 94 octane is all they need but i run premium in my bike because i like to give it a treat and if functions better when accelerating. i suggest that you dont run low grade in any small engine above 85cc's if that... this is because fuels are determined by their grade due to their spontaneous combustion level. if i ran 84 octane low grade in my dirtbike, it would not run properly because the pressure of the compression will heat up the fuel and cause it to combust before ignition, which leads to knocking and can cause serious damage to the engine.but if its worth your time to run low grade fuel in your engine than i dont think it will harm it but i would suggest to run regular or higher.
     
  8. wackey101

    wackey101 Member

    h

    i use shell v power 98 octane works fine cold hot or warm in fact it even gives abit more ppower when the engine is struggling it gives a little boot
     
  9. motorpsycho

    motorpsycho Active Member

    I use whatever gas i can find, as long as it doesn't have water in it.
    My bike motors run the same if i use shell, speedway, B.P., citgo or sonoco.
    87 octane is all i put in it(and everything else i have that requires gas).
    they all seem to run the same no matter what gas is in it.
     
  10. wbuttry

    wbuttry Member

    mine to motorpsycho as long as i mix my oil it purrs like a kitten.
     
  11. Dave C

    Dave C Member

    Some people are real good at necroposting:stuart: That's when you post in a thread that's over 3 years since the last time it was posted in:grin5:

    Be that as it may, the biggest thing today is trying to find gas that has no ethanol in it. I think Shell might be the only one's left here with all gasoline gas.
     
  12. Stan4d

    Stan4d Banned

    Necroposting is encouraged when it is on topic. Good job wacky!!
     
  13. dave1490

    dave1490 Guest


    you are so right lower octain starts it easyer,higher octain gives it abit more power but harder to start.

    a side note allways use shell v-power if you can get it.all the others have 5-15% ethenol.ethenol does NOT mix with oil,a death note for a engine using fuel and oil as a lubicant.
     
  14. Dave C

    Dave C Member

    I somehow knew that if any Gas Company still had gas with no Ethanol it would be Shell and we have Shell stations here :D
     
  15. keatonx

    keatonx Member

    I race dirt bikes so I run my all my engines on 2 stroke racing oil.
     
Loading...