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Old 11-19-15, 01:50AM   #1
sprint250
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Default Blending 100% ethanol with gasoline?

Today at the pump ,before the drive home ,I added 1 quart of ethanol to 5 gallons of 91 octane gasoline.

Initial SOP feel was suprisingly good.
I was surprised.
Engine ran smoother, had better power & torque throughout its operating range. It pulled harder.
Engine is at about 10.75:1 with an aluminum head.
No heat for the carbs other than ambient engine compartment temp.

I had to disconnect the cold air to the carbs last week because of the cold weather.Got to the point one cold morning where I think I acually experienced carburetor icing because of the super cooled moist air going through the carbs.
Gonna try 1/2 gallon etanol per 5 gallons gasoline to see how it reacts.
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Old 11-19-15, 02:38AM   #2
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That's interesting
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Old 11-19-15, 10:03AM   #3
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Question

When u say u added 1 quart of ethanol what exactly do u mean.
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Old 11-19-15, 11:30AM   #4
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Question is
But why?
The regular 15% in the pump piss destroyed all my rubber vacuum hose and vacuum caps
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Old 11-19-15, 03:16PM   #5
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Quote:
Originally Posted by Mb125 View Post
Question is
But why?
The regular 15% in the pump piss destroyed all my rubber vacuum hose and vacuum caps
I wanted to know what exactly he mean by only "one quart" as that wouldn't make any difference if he is using out of the general gas pump. All the new 10 or 15% does is take 89 or 87 and make it 93 octane with the corn alcohol addition the government mandated. All cars have lost 2-3 mpg with this government mandated pump gas and destroys all rubber type lines in your car. All my vehicles have lost 2 mpg and I use only non alcohol unleaded in my cars now. Except the newer cars that have been updated with the SS type lines and computers.
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Old 11-19-15, 06:16PM   #6
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Ken
I was not expecting anything either because it was such a small amount.

It smoothed out.It felt better. That's all I can tell ya.
1 qt to 5 gallons . I did not touch/adjust anything else.
I guess the 91 octane gasoline is just that poor with the compressionthe engine currently has.

It likes VP 110 race gas the best but the alcohol was free so I tried it.


I know the issues with Alky being hygroscopic,being corrosive to untreated aluminum & destroying conventional rubber parts in fuel systems.
I've not used it for those reasons.
That's why I am leary of adding/using more.
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Old 11-19-15, 10:00PM   #7
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Ken
Have you noticed any difference in performance on the same engine since they started adding the stuff as far as performance?
Straight gasoline vs 10%-15% ethanol
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Old 11-20-15, 10:14AM   #8
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Quote:
Originally Posted by Mb125 View Post
Ken
Have you noticed any difference in performance on the same engine since they started adding the stuff as far as performance?
Straight gasoline vs 10%-15% ethanol
The above statements refered to my regular drivers.
I haven't track tested the difference as trying to find 93 in both forms isn't available down here. But do know that I had to replace #10 braided line in my 76 T/A when I went from race gas to pump gas for my 9 sec street combo as the line started to weep gas on my garage floor in 6 different spots after the change to 10% ethanol pump gas. Boy, did that get expensive to replace that line. sigh.

But running 93 pump gas for 6 years and a Pro systems build carb I can't really complain as to performance as the car ran 9.70's out of the trailer. 3450lbs, hyd roller, 10.88-1 compression. Just have to drain the carb if i let it sit for any period of time and watch the braided line.
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Old 11-20-15, 10:16AM   #9
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Quote:
Originally Posted by sprint250 View Post
Ken
I was not expecting anything either because it was such a small amount.

It smoothed out.It felt better. That's all I can tell ya.
1 qt to 5 gallons . I did not touch/adjust anything else.
I guess the 91 octane gasoline is just that poor with the compression the engine currently has.

It likes VP 110 race gas the best but the alcohol was free so I tried it.


I know the issues with Alky being hygroscopic,being corrosive to untreated aluminum & destroying conventional rubber parts in fuel systems.
I've not used it for those reasons.
That's why I am leery of adding/using more.
Could have more to do with how the engine was tuned and carb set to notice an improvement with just that small amount of additive. Plus this new fuel does have a tendency to clean out tanks, lines and carbs. LOL.
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Old 07-08-16, 12:21AM   #10
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Adding the ethanol will increase the octane but will also lean the engine out if its a carb.
I have seen E98 as that's what I use to race but haven't seen 100%
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Old 07-08-16, 11:18AM   #11
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At that point it's makes more sense to run methanol with the proper set up.
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