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This is a discussion on fuel... within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Keep in mind though, that if we simplify, the car follows a map. At some point increasing octane will not ...

  1. #16
    He simply abides. SD_GR's Avatar
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    Keep in mind though, that if we simplify, the car follows a map. At some point increasing octane will not result in a change in how the car runs that you'd notice.

    Since in the US the lowest "high octane" fuel is what is locally called 91, it's reasonable that all Subarus sold here will run with the "baseline" high octane fuel sold here.
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  3. #17
    Moderator Donkey's Avatar
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    Quote Originally Posted by Hogdweeb View Post
    Was talking to a buddy today, recommended regular in my WRX, not premium. Said the Premium combusts too hot, and doesnt have as many lubricants as regular. Also mentioned Premium in Japan is a different Premium than here...
    Your buddy is a moron. There is a reason auto manufacturers make vehicles for different markets. You don't have a "jdm" Subaru just because it was made in Japan. You have a "usdm" Subaru made in Japan for the American market. Simply Google "octane" and read. And octane does not dictate "lubricants". The specific additive packages a certain gas station/company uses does and it will generally be the same across all octane levels. Your owners manual clearly states to use premium fuel for a reason.
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  4. #18
    Registered User wreckingball man's Avatar
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    ^exactly...

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    Registered User subypete's Avatar
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    Quote Originally Posted by Hogdweeb View Post


    These past few days I've been confused... All this talk of knock, and now specifically in regard to fuel. We all know "knock" as that horrific nightmare sound when a rod inside is bad, whether it be bearing, crankshaft, the rod itself, or all of the above... When "knock" is mentioned regarding fuel, what does it "mean" so to speak? How can we tell if we're a victim, and what are the side effects of it?
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  6. #20
    and the Funky Bunch Calvinball's Avatar
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    Quote Originally Posted by Hogdweeb View Post
    How does octane relate to knock resistance?
    It only relates to knock resistance. Octane rating is simply a reference to the percentage of a particular type of molecule in the fuel that, by differing amounts, makes the fuel more or less resistant to knock.
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  8. #22
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    Quote Originally Posted by Hogdweeb View Post


    These past few days I've been confused... All this talk of knock, and now specifically in regard to fuel. We all know "knock" as that horrific nightmare sound when a rod inside is bad, whether it be bearing, crankshaft, the rod itself, or all of the above... When "knock" is mentioned regarding fuel, what does it "mean" so to speak? How can we tell if we're a victim, and what are the side effects of it?
    There's really nothing to be confused about. It's quite simple, really.... and I tend to agree with the rest that have commented about your friend.


    "Knock" in this case, refers to a separate flame front that has developed in the combustion chamber, and opposite the flame front created by the spark plug. These two flame fronts collide and produce a "knocking" or "pinging" sound. This is also known as Pre-ignition.
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  9. #23
    Registered User Ingo's Avatar
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    Side effect?: fires the combustion during the compression cycle, actually tries to drive the piston backwards. It's like hitting the crank with a sledge hammer AGAINST the rotation. Loss of power is the least of effects, broken parts (crank, rods, pistons, rings, -you name it, take your pick) are likely sooner rather than later. Remember, engines run at fairly fast revolutions. If something happens once per turn and causes a very minute bit of damage on 1 turn, after 60 seconds it adds to several thousand times that minute damage - and kaboom
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  10. #24
    Registered User Piratemosh666's Avatar
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    ^^That. Yes....that too. Forgot to mention it. Leads to bad things, man.
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