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Dirt Bike Brands - Other
Race Gas Octane Calculation
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[QUOTE="joshholmes20, post: 1064199, member: 69313"] Back to my post. Octane rating, from what I've gathered, is based on the average of Research Octane Number (calculated by CHEMISTS) and Motor Octane Number (calculated by running the fuel in a standardized engine with an adjustable compression ratio, with the engine running at a certain speed and under load the compression ratio is increased until detonation occurs). The posted "pump octane" is the average of the two, the (R+M)/2 Method. From what I've read the RON is significantly higher than the MON. I've also gathered that Octane rating is merely a rating for the resistance that a fuel has to detonation. Quoting from Marshall Brain from howstuffworks (dot) com: "The name "octane" comes from the following fact: When you take crude oil and "crack" it in a refinery, you end up getting hydrocarbon chains of different lengths. These different chain lengths can then be separated from each other and blended to form different fuels. For example, you may have heard of methane, propane and butane. All three of them are hydrocarbons. Methane has just a single carbon atom. Propane has three carbon atoms chained together. Butane has four carbon atoms chained together. Pentane has five, hexane has six, heptane has seven and octane has eight carbons chained together. It turns out that heptane handles compression very poorly. Compress it just a little and it ignites spontaneously. Octane handles compression very well -- you can compress it a lot and nothing happens. Eighty-seven-octane gasoline is gasoline that contains 87-percent octane and 13-percent heptane (or some other combination of fuels that has the same performance of the 87/13 combination of octane/heptane). It spontaneously ignites at a given compression level, and can only be used in engines that do not exceed that compression ratio." From this information is where I got the idea that I could indeed use Chemistry to calculate the octane rating (being the RON), however I have no way of calculating the MON. Rich, I found the standard distillation curve for Power 110 from their website racingfuels (dot) com: IBP: 98 10%: 155 50%: 210 90%: 240 EP: 320 (all in deg F @ % evap.) This seems to be a fairly suitable race gas if indeed these numbers are correct. [/QUOTE]
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Dirt Bike Brands - Other
Race Gas Octane Calculation
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