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E85 fuel for a 76

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Old May 21, 2007 | 08:12 AM
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Default E85 fuel for a 76

With the recent changes at the pump, I was wondering what E85 would do to an old C3 carb engine. I understand thru some general conversation that E85 burns with oxygen released at a higher concentration than previous gas mixes and thus the new computers are not conditioned for that level. I thought---the vette doesn't have a computer to go out of whack. So what other considerations should there be before putting some in the tank?
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Old May 21, 2007 | 08:35 AM
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http://forums.corvetteforum.com/show....php?t=1603168

The necessary changes have been discussed several times.
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Old May 21, 2007 | 05:02 PM
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A search will tell you not to use E85. Ethanol is highly corrosive and will attack seals and can mess up the tank too. 10% is OK , but, no 85.
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Old May 21, 2007 | 07:52 PM
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I don't know what you would gain either. I have a dual rated truck that is no cheaper to run on e85 because of the decreased gas mileage. I honestly hate it because you have to fill up so often.
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Old May 21, 2007 | 08:53 PM
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I did some more checking today and you both have it right. The fuel economy is terrible against regular gas and the tank will eat out with it in it. Thanks!!!
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Old May 21, 2007 | 10:05 PM
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E85? Made from corn, isn't it?? That sure is what my high compression engine would sound like if I used it. A friggin Popcorn Machine!!!!!
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Old May 22, 2007 | 01:23 AM
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Originally Posted by VettePower
E85? Made from corn, isn't it?? That sure is what my high compression engine would sound like if I used it. A friggin Popcorn Machine!!!!!
Why would it sound like a pop corn machine? The octane rating is 105.

BigBlockk

Later.....
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Old May 22, 2007 | 11:23 AM
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The main things you need to run E85 are different rubber hoses. It'll only eat away your tank if you let it sit in there for a LONG time. You could put an alcohol friendly lining in the tank and that'd prevent it from getting corroded. You'll also have to figure out a way to make it so you can deliver about 20% more fuel to your engine, too. The optimum a/f ratio for ethanol is like 9:1, instead of 13.7:1 for gas.

Your best bet is www.rochesterproducts.com they have a flex-jet kit for like $1000 that comes with EVERYTHING and is designed for Corvettes. Although a better bet is their flex-jection kit in either TBI or MPFI, which runs about $1500 - $1800. Again it comes with everything you need and allows you to run E85 or regular fuel. If you're really serious about wanting to use E85, give them a call and they can get ya a kit made.
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Old May 22, 2007 | 11:26 AM
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Best to leave the E85 for the systems designed to take them. It is not quite backwards compatable without extensive mods.

Even some of the newer cars are not all compatible.
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Old May 22, 2007 | 10:00 PM
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Originally Posted by BigBlockk
Why would it sound like a pop corn machine? The octane rating is 105.

BigBlockk

Later.....

No sh*t!!! Boy, learn something new on the Forum everyday!!!
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Old May 22, 2007 | 10:25 PM
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put some new primary jets in, do a quick secondary metering rod swap and you're good to go.
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Old May 23, 2007 | 12:53 AM
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Yep. Do all that changing so that you can buy fuel that costs more per gallon....and that gets 15% worse mileage. Sounds like a plan????
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Old May 23, 2007 | 03:39 PM
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You guys are getting ripped off!
Our E10 is cheaper than regular unleaded and higher octane. Yes you do use more but that is offset by the cheaper cost, and no pinging!
The ethanol in our E10 is also made from Sugar, which is abundant here. Cheaper than your corn based Ethanol.....
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Old May 23, 2007 | 10:06 PM
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Originally Posted by RHD '68 L89
You guys are getting ripped off!
Our E10 is cheaper than regular unleaded and higher octane. Yes you do use more but that is offset by the cheaper cost, and no pinging!
The ethanol in our E10 is also made from Sugar, which is abundant here. Cheaper than your corn based Ethanol.....
Well your oil is probably more heavily taxed than your ethanol, so that's part of the reason it costs more, for starters.

However you are correct about the sugar based ethanol, it is MUCH more efficient to make ethanol from sugar than it is to make it from corn. This is why Brazil is able have so many ethanol based vehicles instead of gasoline. If the USA had the climate to grow sugar, we could do similar. However, you can grow sugar in MANY places in the world and THEY could sell either the raw sugar cane or refine the ethanol themselves...

Yadda yadda yadda... It's not a 100% solution, but every little bit helps. Lower the consumption of oil and the price will go down, with the demand.
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