Reg. or premium??
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=23305
Printed Date: 22 Feb 2025 at 2:58am
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Topic: Reg. or premium??
Posted By: beeman
Subject: Reg. or premium??
Date Posted: 02 Jan 2011 at 7:38pm
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I'm new to this forum. But love most anything related to Allis Chalmers. My question is should I run premium gas all the time in my 49 B. It does not seem to "mind" the regular stuff . Just curious what everyone else runs. I do add some stabil additive cause my B may sit for in its shed for months .Thanks for your advice.
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Replies:
Posted By: powertech84
Date Posted: 02 Jan 2011 at 7:41pm
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Regular should be just fine. The only reason i ever put premium in is because around here you can't get regular without ethanol in it. I don't like leaving ethanol in if its not going to get used for a while.
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Posted By: OrangePowerGA
Date Posted: 02 Jan 2011 at 8:20pm
I use 89 because it doesn't contain the ethanol like the 87 does. 93 is over kill in my opinion.
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AC - WD
JD - 650
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Posted By: firebrick43
Date Posted: 02 Jan 2011 at 10:03pm
The higher the octane, the lower the btu's per pound, although small. The only reason that you need higher octane is if you have detonation due to high compression ratio. Your B should only have about 6 to 1 compression ratio. Regular gas should be good up to a minimum of 8.5 to 1 and even higher depending on combustion chamber design, valves, piston shape, cooling, and head material.
Be careful about higher octane fuels not having ethanol. Around here in the midwest, all of it pretty much has 10 percent ethanol.
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Posted By: Coke-in-MN
Date Posted: 02 Jan 2011 at 10:32pm
Thats what i thought all gas sold in MN has 10% or greater ethonol added except for Av-gas or some racing fuel .
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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Posted By: Ron(WA)
Date Posted: 02 Jan 2011 at 11:04pm
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Actually, ethanol has a 100 0ctane rating. Ethanol will not bother the engine performance, but could dissolve some of the older rubber tubing etc in the fuel lines and literally gum up the works. I use the grade of gas between regular and premium. I believe the use of the so-called stabilizing wonder drugs is like whistling in the wind.
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Posted By: Gerald J.
Date Posted: 02 Jan 2011 at 11:42pm
Around here (near the Boondocks) 87 octane fuel is unleaded, no ethanol. 89 is E10.
Gerald J.
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Posted By: mdm1
Date Posted: 03 Jan 2011 at 6:28am
I run AV gas in all my off road stuff. A friend told me ethanol turns to acid if left to long. Don't know if that is true but everything runs better for me. I don't mind paying extra if it works.
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Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK!
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Posted By: firebrick43
Date Posted: 03 Jan 2011 at 11:01am
Ethanol doesn't turn to acid. Its hygroscopic, meaning it attracts and absorbs water, almost its entire weight which is both a good thing and a bad thing.
There is ALWAYS water in fuel. For years, people in the snowbelt have used HEET to deice fuel, its ethanol. If you use a tractor/vehicle regularly and refill the tank with some frequency, their is no harm(maybe a plus) in using fuel with ethanol. The ethonol keeps the water in suspension and allows it to be run thought the engine with very little worry of slugging the carb.
The problem comes to when you let it set. In a tractors fuel system, which is vented to air, moisture laden air is brought into the tank with every cooling cycle (at night). The alcohol absorbs it. After it absorbs so much it starts to settle and separate from the gasoline. (Phase separation) After it absorbs its own weight in water, it still attracts water but can not hold anymore and separates into a water layer on bottom, then alcohol, then gasoline. The water then slugs the fuel system(crappy running) and rust the tank if its steel. Some rubbers are affected but fuel lines made in the last 20 years are formulated to resist it so I don't think it to much of a trouble as fuel lines should have been replaced by now anyways.
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Posted By: WC Fields(N_ILL)
Date Posted: 03 Jan 2011 at 11:32am
I only use regular 87 but drain it in the spring fill up with fresh and run the old stuff through my mower.
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37 WC 49 WF 53 WD 67 D15
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Posted By: mdm1
Date Posted: 04 Jan 2011 at 5:32am
Thanks for explaining the ethanol. I am still going to run the RV fuel in my stuff because it really does seem to run better. I don't farm so I really don't use that much. I won't tell my friend as I don't need an argument!
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Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK!
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Posted By: darrel in ND
Date Posted: 04 Jan 2011 at 10:58am
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My brother manages a cenex station, and he explained it to me exactly as firebrick put it, so I guess I go with that theory-if it's going to sit in a tank for any length of time, it had better not be ethanol. Darrel
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Posted By: roscoe
Date Posted: 04 Jan 2011 at 11:56am
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Premium gas (93 octane), whether with ethanol or not, burns slower than "regular" (87 octane) gas, which is why it helps to prevent knocks in some engines, usually large V-8's.
Since these old tractors, when new, could run just fine on "tractor fuel" (~ 65 octane) after warming up on gasoline, any modern gas will be just fine today as long as it is clean and "fresh".
"The lowest grade of gasoline available today is often better than the highest grade available when these engines were built." - TractorData.com
- Roscoe
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