M3 HP

watrob · 10-23-2008, 07:07 PM

Quote:

Originally Posted by Atny286

It is slightly different. I am not going to perform the RON vs AKI calculation, however 93AKI is about 99RON.

Shell V-power has 98-100 in Europe, that's about the 93 here.

The difference is 4 points, 93 US = 97-98 European.

Atny286 · 10-23-2008, 08:23 PM

Quote:

Originally Posted by watrob

The difference is 4 points, 93 US = 97-98 European.

http://en.wikipedia.org/wiki/Octane_rating
It depends on MON and RON octane; however this website says is 4 to 5 points, so I guess you're right!

I got my info from Shell V-power where I assumed that V-power EU = V-power US (RON 98-100 vs AKI 93)

rzm3 · 10-23-2008, 09:28 PM

There are 2 methods to determine Octane rating: RON and MON.

MON basically has more stringent testing conditions, i.e. heated fuel which contributes to more knocking, and it is usually 8-10 lower than RON.

The system usually used in the US is called "AKI", which is an average between RON and MON. AKI=(RON+MON)/2. Therefore, AKI is usually about 4-5 lower than RON.

Example:
RON=100
MON=90
AKI=95

10-23-2008, 09:28 PM	#25
rzm3 Moderator 673 Rep 4,737 Posts Drives: E92 M3 Join Date: Aug 2007 Location: USA iTrader: (18)	There are 2 methods to determine Octane rating: RON and MON. MON basically has more stringent testing conditions, i.e. heated fuel which contributes to more knocking, and it is usually 8-10 lower than RON. The system usually used in the US is called "AKI", which is an average between RON and MON. AKI=(RON+MON)/2. Therefore, AKI is usually about 4-5 lower than RON. Example: RON=100 MON=90 AKI=95
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