High Octane - Snowblower Forum : Snow Blower Forums
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post #1 of 19 Old 12-18-2014, 09:25 PM Thread Starter
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High Octane

I'm no fan of E10 and had always been told to stay with regular grade gasoline.

5 miles down the road is an airport (Sanford Maine) that offers Mogas (91-oct. ethanol free) gasoline.

So in the interest of getting it right a quick search brings me to this B&S page:

What should be the octane rating of my fuel?

It is recommended that fuel with a minimum of 87 octane / 87 AKI (91 RON) is used in our engines. For altitudes above 5,000 feet (1524 meters), a minimum 85 octane / 85 AKI (89 RON) gasoline is acceptable.
Since small engines operate at relatively low compression ratios, knocking is seldom a problem, and using gasoline with a higher octane rating is unlikely to offer any benefit.
For related information regarding fuel, please visit our Fuel Recommendations FAQ.
NOTE: We DO NOT recommend the use of gasoline which contains alcohol, such as gasohol or E85. Gasoline used MUST NOT contain more than 10 percent Ethanol and MUST be removed from the engine during storage if it is not already treated with our Advanced Formula Fuel Treatment & Stabilizer. DO NOT use gasoline containing Methanol. DO NOT use E85 fuel.


<SNIP>


So my read is that going above 87 at a normal altitude will only nick my wallet and if it's the escape route from E10 it's the best thing since sliced bread. Am I missing anything?


Pete
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post #2 of 19 Old 12-18-2014, 09:35 PM
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I would say that your appraisal is accurate. But, I would add that the lack of ethanol would be insurance against other ethanol related repairs. However, if you run it dry, no ethanol is left to do any damage.

But this is just my opinion.

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post #3 of 19 Old 12-18-2014, 10:14 PM
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Yes, it's just going to cost more. I wouldn't go too high with the octane, you'll start to lose power. Unless you increase the compression ratio!
Hmmm....now you have me thinking of another snowblower mod! haha

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post #4 of 19 Old 12-18-2014, 10:26 PM
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I use only non-ethanol gasoline in all my small engines (including my motorcycles). Around here, that usually means the highest grade at the pump. The extra money is not a significant amount since my gas cans are only 2.5 gallons.

I do small engine repair on the side and I must say that I have had to clean or replace many a carb that had residue from the ethanol clogging things up. These were from people who don't properly store their equipment.

That ethanol has generated a lot of money for me with the two stroke engines. The thin fuel lines on the trimmers, chainsaws, blowers, etc... get messed up pretty good with ethanol.

I once read it this way (and I may be wrong) - "Ethanol comes from corn. Corn is a form of sugar. Would you put sugar in your gas tank?"

My two cents.

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post #5 of 19 Old 12-19-2014, 09:27 AM
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Quote:
Originally Posted by Sblg43 View Post
I use only non-ethanol gasoline in all my small engines (including my motorcycles). Around here, that usually means the highest grade at the pump.
Not sure where you are, but most pumps that I've seen across the country have 10% ethanol in all octane grades, unless they specifically say that they are ethanol-free!

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post #6 of 19 Old 12-19-2014, 09:40 AM
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Same thing in MA, all grades of gas have 10% ethanol. 93-94 octane has the same ethanol as 87. If you have an option to buy gas with reduced ethanol consider yourself blessed.
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post #7 of 19 Old 12-19-2014, 09:43 AM
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Fuel

Quote:
Originally Posted by caddydaddy View Post
Not sure where you are, but most pumps that I've seen across the country have 10% ethanol in all octane grades, unless they specifically say that they are ethanol-free!
Either ethanol-free or nonoxygenated in my area.
Around here at least 1 station has a pump listed for classic/collector vehicles and small engines. No alcohol in that gas. You pay a premium for it but it's all I use in my small engines along with topping off the tanks in my Vette and TBird before winter hibernation.
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post #8 of 19 Old 12-19-2014, 09:43 AM
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I use non ethanol 91. 91 is as high as I can get in MT

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post #9 of 19 Old 12-19-2014, 09:57 AM
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What about using 100LL avgas?
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post #10 of 19 Old 12-19-2014, 11:09 AM
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Quote:
Originally Posted by caddydaddy View Post
Yes, it's just going to cost more. I wouldn't go too high with the octane, you'll start to lose power. Unless you increase the compression ratio!
Hmmm....now you have me thinking of another snowblower mod! haha
You couldn't be more wrong. You do not lose power with more octane, thats totally incorrect. Realistically these engines run low compression at low RPMs meaning 87 octane is more than enough. If you can find gas without enthanol at any octane above 87 run that and only that. We are lucky here in Ontario to have Shell 91 and CT 91 which are enthanol free.

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