Octane!


21 replies to this topic
  • Joe Reitman

Posted September 04, 2005 - 07:10 PM

#21

There's so much mythology here....

read up on the subject:

http://www.faqs.org/...line-faq/part3/

In short, Octane is a measure of the fuel's resistance to pressure induced detonation, nothing more. It has nothing to do with energy content, ignitability, flash point, vaporization rate, burn rate, burn temperature, or anything else whatsoever.


However, all those characteristics do vary from one fuel type to another- pump gas has entirely different characteristics than AV fueL or race gas, and among race gas there are dozens of different permutations... Same with pump gas from season to season.

My hazy memory is that the higher octane fuels, due to their greater resistance to detonation, do have less ignitability, higher flash point and less energy content. That decreased energy production is more than offset by the ability to run more compression and timing, for more hp. :D

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  • RichBaker

Posted September 06, 2005 - 11:46 AM

#22

I have not heard that before- anyone ever experience this?

Nope, prob'ly was running avgas and it leaned out on him....avgas will do that.




 
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