One of my coworkers says his chemistry teacher told them (a long time ago) that kerosene has a higher octane value than gasoline. My understanding was always that aviation gasoline has octane value above 120, but it is really gasoline, while kerosene is more like diesel fuel. What is the truth?
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1$\begingroup$ I'm not sure what you are asking. Do you understand what octane means? I think you might be confusing avgas octane with the energy content of a fuel. E.g. diesel has a lower octane than gasoline but a higher energy density. As far as I know, kerosene is only used in jet engines, therefore the octane rating is not relevant. About the only thing answerable in your question is yes, kerosene is more like diesel. You might want to read those articles then reconsider your question. $\endgroup$– SimonCommented Apr 22, 2016 at 7:24
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$\begingroup$ No, I'm not confusing octane with energy content. If, theoretically, one uses kerosene in an internal combustion engine, will the engine suffer from knocking? $\endgroup$– DanCommented Apr 22, 2016 at 7:36
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$\begingroup$ Related: Why do jet engines use kerosene rather than gasoline? and octane rating. $\endgroup$– minsCommented Apr 22, 2016 at 8:07
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Octane rating is a measure of how well a fuel resists detonation, which is the premature explosion of fuel in an engine cylinder before the spark is applied. This is relevant for spark ignition engines which use gasoline type fuels like avgas.
Kerosene has a very low octane rating, somewhere around 15, and isn't a good fuel for spark ignition engines as it would detonate on compression. This is why kerosene and diesel are used in diesel cycle engines which rely on the spontaneous detonation of fuel under pressure. Kerosene is not typically used in internal combustion engines, however in aviation there are turbo-diesel piston engines which run on Jet-A1.
