Quote:
Originally Posted by vasillalov
Well not exactly. Resistance to detonation = AKI -> Anti-knock index. So that's your unit of measurement.
Yes, E85 has additional benefits when it comes to cooling the combustion chamber, but technically, that's different than anti-knock index.
Plain and simple:
USA 91 fuel = 91 AKI
USA 93 fuel = 93 AKI
USA E85 = 94-96 AKI
PURE ETHANOL = 99.15 AKI
Source: http://en.wikipedia.org/wiki/Octane_rating
Do not confuse E85 and pure ethanol. Totally different things.
EDIT:
Take a look here:
http://en.wikipedia.org/wiki/E85
Second paragraph in Octane and Performance Section:
So guys, stop propagating a lie! E85 does NOT have such a high octane rating as you think it does. |
Accusing folks of "propagating a lie" does not encourage informed discussion of any topic, but.... the subject of ethanol's "effective octane" (which is far higher than you suggest), at least in a direct injection motor, is far more complicated.
Take a look at these articles:
http://web.mit.edu/mitei/lfee/progra...2008-01-rp.pdf
http://web.mit.edu/mitei/lfee/progra...2008-01-rp.pdf
dspace.mit.edu/bitstream/handle/1721.1/69496/775670245.pdf
Neil