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post #1 of 6 Old 06-05-2008, 01:13 PM Thread Starter
Join Date: May 2008
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Flex fuel?

I have been using 10% ethanol blend (octane rating 89%) for 3 years and have had no noticeable problems has anyone gotten away with the 85% blend? Any thoughts on how it would affect our "bulletproof" thumper?
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post #2 of 6 Old 06-05-2008, 08:21 PM
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I've heard that E85 is corrosive to engines and containers. I guess this explains it better than I can..

How are flex fuel vehicles (FFV) different from a gasoline-only vehicle?

"An FFV will contain a fuel sensor that detects the ethanol/gasoline ratio. In addition, a number of other parts on the FFV's fuel delivery system are modified so that they are ethanol compatible. The fuel tank, fuel lines, fuel injectors, computer system, anti-siphon device and dashboard gauges have been modified slightly to tolerate the alcohol. This normally includes a stainless steel fuel tank and Teflon-lined fuel hoses. The use of E-85 in gasoline-only vehicles is not recommended as it may cause damage due to the incompatibility of the alcohol fuel (ethanol) with the parts in gasoline-only engines. Performance and emissions will also be compromised."ethanolrfa.org
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post #3 of 6 Old 06-05-2008, 08:34 PM
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I have a flex fuel car. I also work in the service department of a Chevrolet Dealership. You loose a minimum of 25% of your fuel efficiency. It will run on it fine. You will need to go to a larger jet to get it to run right. I have been toying with the idea but I have not figured out how to go back and forth easily. I have a somewhat steady supply of free e50 to e70 from people who put e85 in their non compatible cars. I cannot really justify running it unless I could save 30% on the price per gallon and you can afford to give up 54 miles per tank with out the reserve. I just use the free stuff in my car.
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post #4 of 6 Old 02-11-2009, 10:39 PM
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Experience here.

There is a flex fuel station really close to my house. I went to fuel it up, and they told me three stories of bikers filling up on it, and going, NOWHERE LOL.

For the fun of it, I decided to try it anyways. I filled it up, started it, and knew that I had about a block and a half before I would use up the old fuel in the float bowl, and that is how it worked out, and I had to run the choke almost full on to get it to the house. This stuff runs like a 300 octane fuel.

Before my last engine upgrade, I had a lot of pinging due to carbon biuld up, so I started using the flex fuel to bump up my octane and eliminate the ping, and it works great. The hotter it is outside, the higher the ratio of flex fuel. I have experimented with all of the ratios starting with 5 to 1. That is 5 parts of regular, and 1 part flex. The highest mix that still allowed the bike to run decent, I did in 100 degree heat, and that mix was 60/40, again, the regular fuel is the 60. The flex runs really cold, it works great as an octane booster, and it is really cheap.
But I wouldn't let it sit in your tank and fuel system over the Winter. It definately has corrosive properties on non-flex fuel vehicles, but not running it straight seems to be a no issue. After a summer of running it, I tore down the carb to look at corrosion evidence, and there was none.
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post #5 of 6 Old 02-13-2009, 04:15 PM
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It's easy enough to rejet and run on E85, but then it will be too rich for straight gas. I won't play with it until there are lots of stations that carry it, and then I will do the conversion. The effective octane number will be at least 105 and possibly more. Because it burns slower, it will also require more spark advance. But it will tolerate a compression ratio of around 12.5:1.
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post #6 of 6 Old 02-13-2009, 08:54 PM
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Join Date: May 2008
Location: Portland Oregon
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When to use.

I carry two one gallon cans of flex on the bike. The last desert ride I did was 705 miles in 18 hours. I kept topping off the bike with regular until the day heated up, and I would start to hear a little bit of ping on grades. Then I would put a gallon of flex in which eliminated the ping and brought the power back. Two gallons of flex for two full tanks, translates in to 500 miles easy, and once the day started cooling off again on the way home, I went back to straight regular. It works really well mixing to accomodate the heat as the day goes on.
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