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What are some advantages and disadvantages of using ethanol as a fuel instead of petrol or gasoline?
Wiki User
∙ 9y ago
- Ethanol has less energy than gasoline per unit volume, so will give reduced range between fillups
- Ethanol can dissolve seals used in some older cars, causing serious damage to them
- Ethanol burns hotter than gasoline, risking damage to exhaust valves, etc.
- Ethanol will clean deposits off cylinder walls and rings, possibly causing rings to leak more blowby gases into the crankcase
- Ethanol is currently made mostly from corn, which is fertilized with fertilizers made using petroleum
- etc.
Wiki User
∙ 9y ago
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CORNAnswer:Ethanol fuels can be made from many plant materials containing starches and sugar. This would include cellulose waste, grains, potatoes, sugar cane, or waste foods/Obviously the worst sources would be the usable food products as they can be purposed for human or animal consumption.Industrially, ethanol can be made from etylene from natural gas production, ot ethylene created as a by-product in petroleum or petrochemical manufacture.
What would cause my voltswagon jetta to stop running after using ethanol for gas?
The two biggest issues with ethanol as a fuel are:Ethanol is polar and therefore a much better solvent for some materials than gasoline is; this could result in things like seals and tubing swelling or even dissolving if ethanol is used in a fuel system that was expecting a more or less completely non-polar fuel like gasoline.Ethanol is significantly more hygroscopic (absorbs moisture from the air) than gasoline is. Moisture in the fuel is bad for lots of reasons, including potential rusting of some parts within the engine.Another thing to be aware of is that the energy density of ethanol is about 1/3 lower than that of gasoline, so using ethanol instead of gasoline will result in reduced fuel mileage.Gasoline mixed with 10% or less ethanol is generally okay to use in modern gasoline engines. (Consult your owner's manual to be sure.) Gasoline with more than 10% ethanol can cause problems in vehicles not specifically designed for it (Flex-Fuel Vehicles). FFVs generally state the maximum percentage of ethanol they're prepared to handle; this usually takes the form of a code like E85 (up to 85% ethanol, with the remainder being gasoline).I don't know specifically what your Jetta was designed to handle, but it's likely some problem related to the above.
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Cold ethanol is most likely used instead of room temperature ethanol in order to prevent the ethanol from evaporating. When the temperature of something decreases the molecules speed decreases as well making it less likely to evaporate.
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