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Skillnad oktantal USA


Daniel Linde
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Hej,

Ska beställa en tune från USA.

De vill veta vilken oktan jag kör på.

Kikar man runt så har ju dom andra "oktantal" än vi.

Räknar dom annorlunda eller har vi helt enkelt högre oktan här i Sverige?

Kan ju vara bra o veta vad man ska beställa o vad som är vad här hemma.

De har ju tex 87, 91 osv... ??

Hoppas ni förstår vad jag menar :roll:

// Daniel

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En liten lesøvning :lol:

octane number

a measure used to express the ability of gasoline to reduce engine knocking. Gasoline is a complex mixture of hydrocarbons: compounds containing hydrogen and carbon. Beginning chemistry students learn that "octane" is the name of a hydrocarbon whose molecules contain 8 carbon atoms and 18 hydrogen atoms, the 8 carbons being arranged in a long chain. The compound cars need to prevent knocking is not that octane but a different compound of 8 carbon atoms and 18 hydrogen atoms called iso-octane or, in the more precise language of chemical nomenclature, 2,2,4-trimethylpentane. (In an iso-octane molecule there are only 5 carbons in the chain. Carbons 6 and 7 are attached to the sides of the chain at the #2 position, and the last carbon is hooked onto the #4 position; chemists call this a branched hydrocarbon.) To determine the octane rating of gasoline, a sample of the gasoline is compared to a laboratory mixture of iso-octane and another hydrocarbon called heptane (heptane has 7 carbons and 16 hydrogens, with the 7 carbons in a chain). The mixture is adjusted until it has the same anti-knocking characteristics as the gasoline being tested. The octane rating is the percentage of iso-octane required in the laboratory mixture to produce this equality of knocking behavior. In fact, it's even more complicated: there are two ways to do the test, producing two ratings called the research octane number (RON) and the motor octane number (MON). The MON is typically 8 or 10 points lower than the RON for the same batch of fuel. In the U.S., the number posted on the gas pump is the average of the RON and MON; this average is called the pump octane number (PON). There is a similar unit, cetane number, used for rating diesel fuel.

PUH.... :lol::lol:

Les også her;

http://www.motorcycleanchor.com/motorcy ... ctane.html

John

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