Friday, February 13, 2009

Ethanol/Gasohol Problems with 2 Cycle Engines

Ethanol/Gasohol Problems with 2 Cycle Engines

2 Cycle gasoline engines have new challenges when used with gas containing Ethanol.

A 2 cycle engine gets all of its internal lubrication from a special oil mixed with the gasoline. This premix of oil and gasoline can have serious problems when Ethanol is added to the gasoline. Lubricating oil normally creates a bond with the metal components of the engines. The oil molecules create a boundary layer that protects the metal and reduces friction.

When Ethanol is present it will actually get between the oil and the metal, preventing the boundary layer from forming. This results in little or no protection for the moving components, and little or no reduction in friction forcing the engine to work harder, run hotter, and often to destroy itself.

Also many small engines have plastic carburetors, fuel tanks, and other components that Ethanol can soften or dry out which will cause them to fail. Many rubber fuel lines, o-rings, gaskets, and other parts can be delaminated or turned to a gelatin like material often failing very quickly.

Storing this type of equipment with Gasohol (Ethanol blended fuel) can lead to catastrophic failure in a relatively short time.

There are a very small number of additives that can reduce the negative characteristics of Ethanol in the gas.

We recommend that everyone operating 2 cycle engines switch to a pure synthetic two cycle oil.
The synthetic oil will provide the boundary layer lubrication in spite of the Ethanol.

Please add your comments to this post.

8 comments:

  1. does this breakdown of rubber occur only a certain temperatures or will it happen spontanoeusly at any temperature?

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  2. Local Line LLC is specialised in providing Services and supplies to oil and gas sectors. Supplies different types of chemicals used in oil sectors in the Middle East and around the world.

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  3. My experience with ethanol mixtures in 2-stroke engines has been less than favorable. Ethanol attacks many parts of the fuel system, dissolves gunk, and deposits this mess in the carb - usually killing the engine.

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  4. Én szintetikus 2ütemü olajjal e85 1-25ös arányba használok egy 25ccm fűkaszát,de rendessen felpörög és jól lehet vele dolgozni.

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  5. hi,i live in the u.k. and our petrol supplies because of eec regulations now have to contain a 5% ethanol blend.i have vintage two stroke motorcycles that use a premix in tank system and i'm worried about lubrication problems caused by the ethanol.does a synthetic oil still protect the engine components?do additives like amsoil quick shot work?
    many thanks,martin

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  6. I'm no petroleum expert, but understand that adding a double dose of "Sta-Bil" or other fuel stabilizer to the fuel will help when using ethanol blends. Yes, it's getting difficult to find straight gasoline in many markets. It reminds me of the days when lead was removed from gasoline and some of us had to find alternate solutions.

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  7. Write your states motor fuels agency and request certain stations carry special use 100% gasoline. Back your letter up with a copy going to your governors office or your letter will wind up in the garbage can.

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  8. some small engine mechanics are saying to use 93 octane gas. doe this make a difference? if so how?

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