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Octane render price iso#
For example, n-octane (the straight chain of 8 carbon atoms with no branching) has a -20 (negative) Research Octane Rating, whereas pure iso octane has an RON rating of 100. Different isomers of octane can contribute to a lower or higher octane rating. The anti-knock rating of this mixture would be the same as the percentage of iso octane in the mix.
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The octane rating was originally determined by mixing fuels from only normal heptane and iso octane (2,2,4-trimethylpentane, a highly branched octane), and assigning anti-knock ratings of zero for normal heptane and 100 for pure iso octane. Using gasoline of a higher octane than an engine is designed for cannot increase power output. The octane rating of gasoline is not directly related to the power output of an engine. which is a characteristic of octane's branched-chain isomers, especially iso-octane. "Octane rating" is an index of a fuel's ability to resist engine knock (pre ignition) in engines having different compression ratios.
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"Octane" is colloquially used as a short form of " octane rating," particularly in the expression "high octane".