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Originally Posted by Jaxonalden
High octane fuel doesn't necessarily burn hotter, it's simply more stable than lower octane fuel. That's why high compression engines (ours) and forced induction engines (turbo charged and supercharged) need high octane.
If you run 87 in the for mentioned engines, without a knock sensor retarding the timing, you'll damage the engine because of pre ignition.
The engine will be livin' the good life on 100, Europe has 98 everywhere and I can't tell you how well 1.1 and 1.8 liter cars run.
P.S. Adam, damn nice car!!
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The motor will run smoother on 100 octane, that's all.. The DME won't compensate for it because it only compensates up to 93 octane.
Euro 98 octane is equivalent to 91-92 octane in the US because of the different rating system: AKI (Ron+Mon/2) in the US and Ron in the EU.
Also, a partial or combination fill of different octanes, such as 50% 91 octane and 50% 100 octane does absolutely nothing, contrary to a common misconception! It does not average out to 95.5 or anything else.
Each octane mix has a different chemical composition. What we call gasoline can have as many as 90 different chemicals making up the mix, even for the same brand, same octane, in different regions and even different refinery batches. It's just that this combination (whatever it may be), acts the same as a certain combination of 2,2,4-trimethylpentane and n-heptane when put in a variable compression test engine - octane. More importantly, each has a different specific gravity. They do NOT mix!
Instead, one of the fuels will be heavier and sink below the other in the tank. First you'll burn one octane until the tank drains it, then you'll burn the second octane. Unless you had an agitator in the tank, or were pulling
extremely violent maneuvers (constantly) you would NOT be delivering a dose of each fuel to the cylinders at the same time.
