Thread: jet fuel

3, actually. RON, MON, and AKI. US/Canada use AKI (anti-knock index) also known as (R+M)/2 method. Otherwise, RON (research octane number) is commonly used worldwide, and MON (motor octane rating) also known as aviation lean octane rating.

Because of these differences, and how they are calculated via RPM, ignition timing, preheating, and such, the same numbers can mean very different things. A basic rule, though, when comparing numbers worldwide (America's AKI versus RON worldwide), is the America's octane rating number is shown 4 or 5 points lower than similar gas used worldwide. So for the exact same gas, the RON (worldwide) could be 95, but the AKI (US/CAN) will be 90.

MON I've never really looked into, so as for the differences between the posted octane ratings versus MON I don't know. From what I remember it's similar to RON but results in a lower numbered rating. If the RON is 95, the MON will be significantly lower, somewhere in the 85 range.

Here's a quick conversion for common US to Worldwide octane ratings:

US........Worldwide
87..........91/92
90..........95
93..........97/98
97/98.....102

Thank you for the correction and the lesson.

Hey, whatever I can do to help. now if I could only figure out why we can't use the same measures for everything worldwide......frickin standard wrenches......

If we all used the same measure for everything that would make life too easy

that explains why the US 90 octane gas its better than the mexican premium suposed to be 93 octanes

Well RON and MON also use different test engines for their measure, one is biased to high power full load runs and the other is more light duty behaviour.
Even if there was only one test method each engine design responds a little bit differently to the fuel depending upon how it was blended and the base stock it was made from.

Mike

I've never used Jet Fuel before, but I know my father when he was younger used to race his 69 Camaro down at the local airport and they used to steal jet fuel, he ended up blowing up the motor (from the jet fuel) after a couple weekends. I would say, go ahead and use it but use it wisely

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