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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Fuel observation/question /cgi-bin/YaBB.pl?num=1350260310 Message started by Greg on 10/14/12 at 17:18:30 |
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Title: Fuel observation/question Post by Greg on 10/14/12 at 17:18:30 I understand 87 octane is all I need for my bike. I understand E10 is poop. What I don't understand is why when I run 89 octane pure gas the backfire at shutdown is substantially reduced. It also idles better and has less shift pops. This is compared to E10 87, 89 and pure 87 octane. Why is this happening? |
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Title: Re: Fuel observation/question Post by tizzyfit on 10/14/12 at 18:20:13 Greg, I wish I could offer something meaningful. I ran 5 tank fulls of regular gas, NO ethanol, and got the same gas mileage as well as the same backfire, farting, etc as I do with the 10% ethanol crap. All it says to me is, these engines will burn just about anything and provide a degree of reliability in the process. |
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Title: Re: Fuel observation/question Post by Serowbot on 10/14/12 at 18:45:34 Octane increase increases the temperature required to ignite the fuel. Your engine don't need or want it... but maybe the temps in the pipe aren't enough to cause ignition of unspent high-octane gas... Thus,.. less pops... Alternatively,... the slower ignition rate of the high-octane fuel, may be sending more unspent fuel down the pipe, resulting in a cooler pipe... ... or.. a bit of both... ... or not... :-?... |
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Title: Re: Fuel observation/question Post by Charon on 10/14/12 at 19:23:06 Here in Central Nebraska, we don't usually have all those choices. The 87 octane is usually the "pure gasoline" and usually goes for 10 to 20 cents more per gallon. The 89 octane is the E-10, and is the bigger seller because it is a few cents less expensive. I have run both, and tried to keep at least a few notes. But I cannot tell any difference in anything I own or have owned for at least the last ten years in terms of mileage or anything else. For the last year or two I have been tagging my fuel purchases on Fuelly with "E-10" when I am reasonably sure that is what I purchased. Sometimes I don't know, as some pumps are just marked with something like "May contain up to 10% ethanol." Just remember, if you try to derive something from my Fuelly tags, the "E-10" tag applies to the present fill-up, but the mileage is from the last one. By the way, I have NEVER been able to see any damage or deterioration in any fuel system parts which I can attribute to ethanol. And I have been using it for over thirty years. |
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Title: Re: Fuel observation/question Post by Gyrobob on 10/14/12 at 19:34:51 The main damage from ethanol is the harm to the economy. |
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Title: Re: Fuel observation/question Post by Charon on 10/14/12 at 19:56:37 4A747F626F626F0D0 wrote:
I was trying to avoid that discussion, as I have rather mixed feelings about it. Bear in mind I live in Nebraska, where a lot of corn is grown. The current drought is having its effect on corn availability and prices, with resultant effects on ethanol plants and cattle feeding operations. A good time is being had by all. |
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Title: Re: Fuel observation/question Post by 07s40scotty on 10/14/12 at 21:01:22 3325322F37222F34400 wrote:
You....... rock man! That right there is profound. You answered like 5 questions that I've been wondering about & made me laugh at the same time :D |
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