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Cobra Forums
2013-14 Shelby GT500
E85 Questions. Yes, I did a search before anyone gets their panties in a bunch.
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<blockquote data-quote="Bad Company" data-source="post: 17024470" data-attributes="member: 141815"><p>E85 has a higher octane rating, plus the alcohol has a cooling effect. Ethanol evaporates at 172*F if I remember correctly. The octane rating for 100% ethanol is around 106 if I'm remembering correctly. The downside is if you live in cold climate. The government allows the producers of pump E85 you buy at the local station to be as low as E51. 51% ethanol. This is why the minimum octane rating is much lower than what true 85% ethanol would test at. Why do they allow E85 to be as low as E51? In the winter months it becomes harder to start a cold car engine on a high ethanol percentage because of the much lower evaporation temperature of the ethanol. The raise the gasoline. The ethanol being sprayed by the injectors into an engine that is sitting outside on a cold 10*F day tries to puddle instead of being an atomized and fume mixture. The engine tries to flood </p><p></p><p></p><p>Pump E85 has less energy per gallon by 35% and usually a minimum octane rating of 95, but is usually higher than this as the percentage of the ethanol rises. So to maintain the Hp you need inject 35% more fuel by volume. This requires bigger injectors and fuel pumps. I'm not sure I'd try the BAP systems for the pumps. With the cooling effects and higher octane ratings of E85 you can advance ignition timing for more Hp. </p><p></p><p>The fuel also wants to absorb moisture out of the air, so you have to drive the car to keep the fuel fresh and you need to install a high quality fuel filter and check it or replace it regularly.</p></blockquote><p></p>
[QUOTE="Bad Company, post: 17024470, member: 141815"] E85 has a higher octane rating, plus the alcohol has a cooling effect. Ethanol evaporates at 172*F if I remember correctly. The octane rating for 100% ethanol is around 106 if I'm remembering correctly. The downside is if you live in cold climate. The government allows the producers of pump E85 you buy at the local station to be as low as E51. 51% ethanol. This is why the minimum octane rating is much lower than what true 85% ethanol would test at. Why do they allow E85 to be as low as E51? In the winter months it becomes harder to start a cold car engine on a high ethanol percentage because of the much lower evaporation temperature of the ethanol. The raise the gasoline. The ethanol being sprayed by the injectors into an engine that is sitting outside on a cold 10*F day tries to puddle instead of being an atomized and fume mixture. The engine tries to flood Pump E85 has less energy per gallon by 35% and usually a minimum octane rating of 95, but is usually higher than this as the percentage of the ethanol rises. So to maintain the Hp you need inject 35% more fuel by volume. This requires bigger injectors and fuel pumps. I'm not sure I'd try the BAP systems for the pumps. With the cooling effects and higher octane ratings of E85 you can advance ignition timing for more Hp. The fuel also wants to absorb moisture out of the air, so you have to drive the car to keep the fuel fresh and you need to install a high quality fuel filter and check it or replace it regularly. [/QUOTE]
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2013-14 Shelby GT500
E85 Questions. Yes, I did a search before anyone gets their panties in a bunch.
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