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Old 09-07-2011, 06:51 PM
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Join Date: Mar 2007
Location: Waco, TX
Cobra Make, Engine: Lone Star Classics / Roush 427 SR
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Here is the method I use to check the ethanol content:

The logic is that ethanol will mix with water and separate from gasoline and you can see the separation very well, especially in a glass container.

It is first helpful to make some graduation marks on the container with a magic marker. Make them at 90 and 91 CC, and 9 and 10 cc. A tall container like an olive bottle works well.

I used a glass container and filled it with with 90 cc of water, added 10 cc of 93 octane gas, shook it up, let it settle a bit and read the numbers. With the 93 octane, I ended up with just what I put in the container....90 cc of water and 10 cc of 93 octane.

When I tried the same procedure with 91 octane....as well as 87 octane....I came up with what I think is a 10% ethanol blend.

I started off with 90 cc of water, then added 10 cc of 91 octane, shook it up and when it settled, I had 91 cc of water and 9 cc of gas or a 10% loss in the quantity of gas I put in and a corresponding gain in the water as the ethanol mixed with it.

The same 10% ethanol mix numbers showed up with 87 octane gas.

The method is very primative, but I think it works.

Jody
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