Come one, come all and Rob, you're welcome.
For the regulars, popcorn and tea is provided.
For tokay444 and those of you with something to learn, reading glasses are provided.
In this wonderful publication you cited:
there's some information to be learned.
Context clues for those who have a hard time interpreting titles and forgive me if the clues are repetitive.
Effective Octane And Efficiency Advantages Of Direct Injection Alcohol Engines
Key in this title are Effective
and Direct Injection
, you'll notice I've highlighted them to catch your eye. The Effective
should be read as "Look here I'm going to combine multiple effects and sound all scientific as I tell you how alcohol works in a direct injection engine" and the Direct Injection
clues you in to "This only applies to direct injection engines."
Looking a little further into the article you'll see we read the title correctly.
Methanol and ethanol have important effective octane number advantages result from the large amount of evaporative cooling that results when they are directly injected into the engine cylinders.
Here they list what qualifies this as Effective
and yet again there's alcohol and Direct Injection
In the third section you'll see the direct contradiction to what you posted in Rob's thread.
Table 1 shows the properties of gasoline, ethanol and methanol [SAEJ1297, Hunwartzen]. Ethanol is reported as having an octane rating of 129 (RON) and 102 (MON), with a combined octane rating of 115 ((R+M)/2). Methanol reported as having an octane rating of 133 (RON) and 105 (MON), with a combined octane rating of 119 ((R+M)/2). In contrast the combined octane rating of regular gasoline is 87 and that of premium gasoline is 93.
In which case you should re-evaluate your knowledge of the subject as it's clear you're not sure what RON, MON or Road Octane calculations are. Drat, let's consult Google so we know what we're talking about.
Oh look, the first link is to a Wikipedia entry conveniently titled "Octane Rating."
Lo and behold we have our answer and can further confirm we really don't know what we're talking about and should shut up or do further research.
To wrap up this post I've spent way too much time on, we have the glaringly obvious point to this paper:
In this paper, the effective octane of the alcohols is determined using a computational model for the engine and the air/fuel chemistry.
Now we realize that this paper doesn't apply to the discussion at hand and we simply don't post the information we've found to be wrong.