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post #1 of 4 Old 05-09-2011, 03:31 PM Thread Starter
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Wee and Lower Grade Fuel Question

Hi there.
This summer I'm taking a trip trough EU-STANS-MONGOLIA and back with a 0'6 650.
In many reports I've red about the stans and mongolia that many place offer only low octane fuel, like 87.
I was wondering should I need some CAT modifications in the exhaust or anything else.
Thank you for the help in advance.
Cheers

Last edited by maro; 05-09-2011 at 03:39 PM.
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post #2 of 4 Old 05-09-2011, 03:47 PM
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We need to keep in mind that there are at least two ways to calculate the octane level, Research Octane Number and Motor Octane Number...and their average.

Research Octane Number (RON)

The most common type of octane rating worldwide is the Research Octane Number (RON). RON is determined by running the fuel in a test engine with a variable compression ratio under controlled conditions, and comparing the results with those for mixtures of iso-octane and n-heptane.

Motor Octane Number (MON)

There is another type of octane rating, called Motor Octane Number (MON), or the aviation lean octane rating, which is a better measure of how the fuel behaves when under load, as it is determined at 900 rpm engine speed, instead of the 600 rpm for RON. MON testing uses a similar test engine to that used in RON testing, but with a preheated fuel mixture, higher engine speed, and variable ignition timing to further stress the fuel's knock resistance. Depending on the composition of the fuel, the MON of a modern gasoline will be about 8 to 10 points lower than the RON, however there is no direct link between RON and MON. Normally, fuel specifications require both a minimum RON and a minimum MON.

Anti-Knock Index (AKI)

In most countries, including Australia and all of those in Europe, the "headline" octane rating shown on the pump is the RON, but in Canada, the United States and some other countries, like Brazil, the headline number is the average of the RON and the MON, called the Anti-Knock Index (AKI, and often written on pumps as (R+M)/2). It may also sometimes be called the Pump Octane Number (PON).

Difference between RON and AKI

Because of the 8 to 10 point difference noted above, the octane rating shown in the United States is 4 to 5 points lower than the rating shown elsewhere in the world for the same fuel.

Octane rating - Wikipedia, the free encyclopedia

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post #3 of 4 Old 05-09-2011, 04:15 PM
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Yay, another insightful octane thread, what great value these threads offer!!
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post #4 of 4 Old 05-10-2011, 08:52 AM
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I only run the low octane stuff in my Wee, 87 or 85. It runs just fine. Granted that's in the US...don't know about the overseas stuff. I don't think it would be a problem as long as its clean (no water or debris in the fuel also).

Hope this helps.

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