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Adding ethanol to petrol 2 stroke mix

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Adding ethanol to petrol 2 stroke mix

Old 05-31-2010, 03:43 PM
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Default Adding ethanol to petrol 2 stroke mix

Is there any advantages to adding ethanol to petrol, would it help power and transition, will be using on spark conversion super Tigre g90
Old 05-31-2010, 07:14 PM
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Default RE: Adding ethanol to petrol 2 stroke mix

Most people are more concerned about how to get the ethanol out of their gasoline.
Old 05-31-2010, 07:40 PM
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Default RE: Adding ethanol to petrol 2 stroke mix

Most Alcohols in Petrol are hard on diaphrams in Walbro, Tillotson and Zama carbs.
Old 05-31-2010, 07:45 PM
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Default RE: Adding ethanol to petrol 2 stroke mix

I ain't adding any Jack Daniels to my fuel.

AFAIK there is no advantages, only disadvantages, when there is ethanol mixed into gasoline (petrol). Hardening of the non-metallic bits of the Walbro and Tillotson carbs is common when there is ethanol in the fuel mix.


Old 06-18-2010, 02:13 AM
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Default RE: Adding ethanol to petrol 2 stroke mix

There can be some power gains to be had from adding Ethanol to gasoline (petrol). Also there will often a big rediction in vibrations. The Ethanol is more slow to ignite and the flame front tends to be slowwer so leading to less knock and less vibrations . Advancing the ignition is often required . Also as the Ethanol has oxegen in it molicule there is power gains up to maybe ~30% in not having to extract the oxegen from the atmosphere. This also means that the fuel consuption will rise so requiring the jet needle to be open maybe as much as ~30% to allow more fuel in and will mean leass run time per tank . Often it will require a hotter spark plug to make the ethanol ignite .The single biggest issue is the lubricating oil .
Lubricating oil from gasoline (petrol) is often ~3% (needle bearing for piston con rod )or ~6%(bush bearing for piston con rod ) as the gasoline (petrol) has a lubricating effect of its own .
Running on pure ethanol could often require up to~17% oil to lubricating oil in the same engine but ~10% synthetic is the norm for needle bearing in the piston con rod . The issue is that the glow fuel type lubricating oil wont mix with gasoline (petrol)so well. So for example a 50/50 mix of gasoline (petrol) and ethanol wouldnt be ~3% (needle bearing for piston con rod ) for the gasoline (petrol) and ~10% for the ethanol making some ~7% mix as one would think
It is probably going to be closer to a ~10% mix overall using only glow fuel lubriacting oil mix for all the 50/50/ mix using only 100% of glow lubricating fuel mix .
As glow fuel lubricating oil is often double the price for the gasoline (petrol) versions that can make running costs increase a lot .
Small amounts of Ethanol like 5% mixxed in gasoline (petrol) which is often the normal car fuel found in Europe probably wont show these issues and often most flyers just use this fuel as 100% pure gasoline (petrol) in europe probably not aware that there is 5% ethanol in the mix .
However probably once the mix has more than 10% ethanol in it there exists risks from lubrating oil falling out of suspension to issues from the fuel lines or carberator diagpfram issues starting up .

Car fuel supply forecourts also supply E85 fuel which is widly available in Europe .This is 85% ethanol and 15% gasoline (petrol) would really probably have to be treated as more similar to 100% ethanol for lubrating solutions . OS engines do supply one engine to run on this type of E85 fuel


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