104 octane

Discussion in '80-Series Tech' started by concretejungle, Aug 15, 2005.

  1. concretejungle

    concretejungle

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    Blow the top of the motor off, or help flush and clean injectors and such? There is a gas station very close that sells it. I'm sure it wouldn't be good to run full time, but i didn't know if mixing it in with regular or just one tank every so often would be beneficial or detrimental. I would run half 104 and half 93 in my motorcycle with great results.
     
  2. santiagol

    santiagol

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    When I was in college I worked at a flying school and people would drive up every so often and put 100/115 in their cars and motorcycles. The aviation mechanics said it did no harm but no benefit either.
     
  3. hoser

    hoser SILVER Star

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    Money would be better spent on servicing your injectors, changing your fuel filter or possibly even sea foam.
     
  4. Doc

    Doc

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    If you're running some kind of FI, then by all means. go for it!

    If not, buy a can of seafoam for $4 and call it a day.
     
  5. Scamper

    Scamper

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    The higher octane does not mean greater cleaning power. It's only a measure of how well the fuel does to prevent detonation. The gov specifies minimal requirements for detergents in gas, and all gas is supposed to have this; some brands will add additional proprietary agents. In fact, if this gas is refined/produced outside of the "normal" channels, I would question whether it was even meant for consumers and if it had the basic additive package... :rolleyes:

    Betcha it's expensive too.
     
  6. concretejungle

    concretejungle

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    $4.25/gallon
     
  7. Lockd97

    Lockd97

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    :beer: Higher octane means a slower burn rate (hense the prevention of detonation mention by Scamper). Higher compression benefits from higher octane, that is why if you have a S/C you are required to run premium fuel. The blower raises the effective compression ratio under boost conditions. I found a boost compression ratio calculator that gives my effective CR and my altitude.

    You are running 5 PSI of boost at an altitude of 4200 feet. Your motor's static compression is 9 :1. At this boost level and altitude your effective compression ratio is -11.22 :1, and without altitude correction your compression ratio would be 12.06 :1.

    11.22:1 on 87 octane is looking for trouble really fast!

    calculator I used...

    I don't think the cleaning aspect will be any better than regular.
     
  8. Gauge

    Gauge

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    If you have higher compression and use a low octane fuel, (such as someone with a supercharger running 87 octane), couldn't you just retard the timing of the engine slightly? I suppose I am missing something, because in theory more air needs more fuel, and timing wouldn't correct for this.

    I think I am confusing myself......
     
  9. cruiserdan

    cruiserdan SupportingVendor Emeritus Moderator

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    It would take more than "slightly" and the engine would run like crap. Retarding the timing will also cause cylinder temperature issues.
     
  10. Lockd97

    Lockd97

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    What CDAN said!
     
  11. reffug

    reffug

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    Man with the price of premium where it is now :eek: this entire notion is just way out of my purview as far as reality goes.
     
  12. concretejungle

    concretejungle

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    Yea, can't really afford to do it with the cruiser, besides i'm wishing i could run mcdonald's old french fry oil in my junk.......
     
  13. sonoranfun

    sonoranfun

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    Bio-diesel baby! Not sure what the hell that really is but I think if you had a diesel VW TDI and could make your own it would save you some money!
     
  14. Doc

    Doc

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    There's a great thread on bio-diesel in the international forum, explains a lot.
     
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