Mileage (mpg) Using Ethanol Seen 20% Higher Than EPA Says - Bloomberg

[Bill USA]

72. your personal attack on me does not make up for your lack of an argument. You are claiming that I

equated latent heat and octane with efficiency. Your claim is patent nonsense. There is nothing in my comments which would lead one to conclude I was 'equating' octane or latent heat with engine efficiency...no matter how much you might wish it were true.

What I said was that higher latent heat cools the air fuel charge and allows for a additional combustion chamber pressure (in this case supplied by the turbo-charger).. I have stated that higher octane allows the fuel to be burned at higher combustion chamber pressures without detonating. There is nothing incorrect in these statements.

Now, as far as the efficiency claim goes, I am referring to the work of Mssrs Cohn, Bromberg, Heywood, for that... it is their claim .. which Ford Motor co. confirmed when they made a prototype of their own. Cohn, Bromberg and Heywood state in the documents I provided you links to, which I believe you referred to a 'remedial writings' that the increased turbo-boost provides higher combustion combustion chamber pressures. The directly injected ethanol enables combustion at these higher pressures without detonation .. and as they state, enabling the achievement of greater efficiency (note downsizing plays a part with lower friction).


NOte, the achievement of greater efficiency is simply based on Cohn, Bromberg and Heywood's modeling and by empirical testing by Ford Motor co.

I refer you to the source material:

[link: http://www.ethanolboost.com/LFEE-2005-01.pdf|Direct Injection Ethanol Boosted Gasoline Engines: Biofuel Leveraging For Cost Effective Reduction of Oil Dependence and CO2 Emissions]

D.R. Cohn*
L. Bromberg*
J.B. Heywood‡

http://www.ethanolboost.com/LFEE-2005-01.pdf

[font size="3"]Abstract

Ethanol biofuel could play an important role in reducing petroleum consumption by
enabling a substantial increase in the[font size="5"] fuel efficiency [/font]of gasoline engine vehicles. This ethanol boosted engine concept uses a small amount ethanol to increase the efficiency of use of a much larger amount of gasoline [font color="blue"](relative to the volume of Ethanol being used_Bill USA)[/font] by approximately 30%.

...The concept uses appropriately controlled direct injection of ethanol
into the engine cylinders. The direct injection provides suppression of engine knock at
high pressure. This allows high pressure operation of a much smaller, highly
turbocharged engine with the same performance as a larger engine. The engine can also
use a higher compression ratio. The engine downsizing and higher compression ratio[font size="5"]
results in a large increase in fuel efficiency[/font].[/font]

NOte that increase fuel efficiency is stated as the[font size="3"] result[/font] of engine downsizing and higher compression operation.

All I am doing is reporting on the claims of Cohn, Bromberg and Heywood (confirmed by Ford Motor Co.). If you think they are all wet, or confusing octane and latent heat with efficiency - why don't you scream at them.

If we are agreed that higher octane rating allows for combustion at higher pressures and that higher latent heat cools the combustion chamber - which enables greater combustion chamber pressures (by soaking up someof the heat induced by higher pressures) and if you can see that I am just reporting what the three eminent professors at MIT have said, then I don't see what the problem is.

...unless, you just have a need to have the last word....