Ethanol - 15-20%? - Toyota Yaris Forums

Zaphod · 05-06-2010, 03:35 PM

Quote:

Originally Posted by 127.0.0.1

never will happen. requires too much surface area and time.

technology will solve the problem another way

Wait until oil demand reaches it's peak in China alone.

Yaris Hilton · 05-06-2010, 03:46 PM

Ethanol in gasoline both reduces miles per gallon, because it contains less energy per gallon than gasoline, AND raises octane. By the cockamamie system we use in the U.S. to post octane numbers on the gas pump, (Research Octane Number + Motor Octane Number)/2, blending 10% ethanol by volume raises the octane number by approximately 2-3 over the base gasoline's value. Not a huge boost, but noticeable.

In many other countries the Research Octane Number is posted. That's obtained in a special variable compression low speed engine breathing cool air. The Motor Octane Number is measured using a higher intake air and coolant temperature, with the engine running at a higher speed, and is more representative of conditions in a car engine. It's a good bit lower than the Research Octane Number, and the spread between them is a rather variable number called the fuel's "sensitivity."

Hershey · 05-07-2010, 12:08 AM

Quote:

Originally Posted by Zaphod

Wait until oil demand reaches it's peak in China alone.

large vehicles are a hot commodity in CHINA . More need for roads . The race is on .

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05-06-2010, 03:46 PM	#2
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	Ethanol in gasoline both reduces miles per gallon, because it contains less energy per gallon than gasoline, AND raises octane. By the cockamamie system we use in the U.S. to post octane numbers on the gas pump, (Research Octane Number + Motor Octane Number)/2, blending 10% ethanol by volume raises the octane number by approximately 2-3 over the base gasoline's value. Not a huge boost, but noticeable. In many other countries the Research Octane Number is posted. That's obtained in a special variable compression low speed engine breathing cool air. The Motor Octane Number is measured using a higher intake air and coolant temperature, with the engine running at a higher speed, and is more representative of conditions in a car engine. It's a good bit lower than the Research Octane Number, and the spread between them is a rather variable number called the fuel's "sensitivity."