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'Octane' the rating is a general term. In fact, what most people quote as an 'octane rating' is more specifically the Pump Octane Number PON. It is the average of the Motor Octane Rating and Research Octane Number. Two methods of determining the 'octane rating' of a fuel under different conditions. However, both these ratings are on a 0-100 scale......actually it's more of a 70 to 100 scale (due to the use of iso-octane and n-heptane as the referance fuels). So your next question of course is, how can fuel then be rated at over 100 octane. Well it's very simple. Most 100+ octane fuels cary a dual rating although in motorsports we completely ignore this fact. The first number is the PON rateing while the second (greater than 100 number) is the supercharge number. The method of determining the supercharge number is different and a rateing of 110 means that given a forced induction engine, it can make 10% more power with the 110 fuel than on 100 PON fuel (assumeing it's tuned for the 110). Of course by tuned don't think I mean 'street tuned' I mean that the engine will make 10% more power before knocking. Check this paper I wrote for a descent overview.....couple other people have pretty descent descriptions too. Fuel paper
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"I have no experience with this specific pump so don't continue reading expecting to find you answers." - ZLover4Life 07:14 3/16/04
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