Is Higher octane good for your Happy time??

Discussion in 'General Questions' started by StrontiumEthics, Aug 21, 2008.

  1. StrontiumEthics

    StrontiumEthics Motored Bikes Sponsor

    I figured since Higher octane, for example 93 gasoline is good for your car its maybe good for your happytime. Is this true? If not what kinda gas should i put in my engine?

  2. xlastshotx

    xlastshotx Member

    Well everything that I have learned over the years, is that basically higher octane is not better for your car or any vehicle unless it is required. Generally the higher compression of your engine the higher octane of fuel you need, this is to reduce knocking/pinging/detonation (all the same thing), this occurs when part of the fuel-air mixture in one or more of your cylinders ignites spontaneously due to compression. Higher octane fuel is made to withstand higher compressions without detonation. Higher octane fuel will not result in better gas mileage or more performance (unless you have a high compression engine), it is also no cleaner than any other grade of pump gas.

    I cant imagine the stock HT motors running at a very high compression (maybe someone with more knowledge of the HT motor can chime in and tell us what compression these things run), I would think that 89 would probably be best for the HT motors.

    I hope this helps :).
    Last edited: Aug 21, 2008
  3. BSA

    BSA Guest

    No, these engines will run better and start easier on low octane fuel.

  4. softride

    softride Member


    what they said:grin::grin::grin::grin::grin:
  5. Esteban

    Esteban Active Member

    The oil companies like you !
  6. xlastshotx

    xlastshotx Member

  7. hill climber

    hill climber Member

    if you look in the color insrtuction book it says minimum 90, at least mine from kings does.
  8. Warner

    Warner Member

    Keep in mind the octane ratings methods are different in other countries....I posted this a while back, but here it is again:

    One thing to remember about recommended octane levels coming from other countries is that they have different rating systems. Japan and Europe use a system called RON or Research Octane Number to determine the octane rating of their gasoline, while stateside we use a system called AKI or Anti-Knock Index to determine gasoline's octane rating... Interestingly, to further complicate things it would seem that our own AKI system is actually derived from the average of the RON system and another more complicated system referred to as MON or Motor Octane Number... So, to recap our methodologies for measuring gasoline's octane rating are different, but share some common elements...
    So, with the commonality of RON in mind a good rule of thumb is as follows, multiply the foreign RON Octane rating by 0.95 and you will have the US AKI equivalent.

    ( RON Octane Rating x 0.95 = AKI Octane Rating )
    90 RON Octane x 0.95 = 85.5 AKI Octane (US measure)
    98 RON Octane x 0.95 = 93.1 AKI Octane (US measure)
    100 RON Octane x 0.95 = 95 AKI Octane (US measure)

    So, as you can see the 93 or 94 octane fuel we are all paying an arm and a leg for is actually quite comparable to the higher octane fuels found in Europe and Japan. I suspect that the recommended 90 Octane rating that you are getting from the Chinese motors is based off of the RON Octane rating and would equate to AKI (or US method) Octane rating of only 85.5

  9. Skyliner70cc

    Skyliner70cc Active Member

    I was first to reply to this posting but I guess someone deleted it.

    No, not better unless engine is designed for higher octane or engine has problems with knocking under load and/or high temps.

    Be wary of advertising and always be skeptical. Marketing executives love folks who believe all advertising they push on the public.

    Another myth: 3,000 mile oil changes. My wife's vehicle has 12,500 mile oil change intervals and oil analysis confirms oil is holding up and engine wear is good with this interval. 12,500 mile OCIs is per her owner's manual for her driving style. My vehicle has 10,000 oci's for warranty to remain in effect.
  10. Simonator

    Simonator Guest

    dyno or synthetic oil?
  11. alex

    alex Guest

    happy-times run about a 6:1 compression ratio and as xlastshotx and bsa said, lower compression needs lower octane. For example, my brother's honda element runs a 9.5:1 ratio and runs perfect on regular. So, you could probably get away with running a much lower octane than 87 in a happy-time.

    Oh, and the science behind my reasoning is that the higher octane rating a fuel is, the more it has to be compressed to ignite properly. And it is the same thing with low-octane fuel- it requires less compression to ignite.

    A happy-time might run better on less than 87 octane, good luck finding it though.
  12. xlastshotx

    xlastshotx Member

    wow 6:1?? that is really low... Yeah you could probably run it off 83 and it would still be happy, lol.. I used to run my Yamaha Banshee off 110octane avgas.
    Last edited: Aug 22, 2008
  13. Simonator

    Simonator Guest

    yea.... I did a compression test on mine..... 70 psi
  14. xlastshotx

    xlastshotx Member

    Wow crazy :p
  15. Simonator

    Simonator Guest

    I think my engines compression is a little on the low side. But hey, it works.