E-85??
 

Has anyone tried E-85? If so what ration of it did you run, did you mix with 93 octane. If I ran it alone what would be a good start for rejetting the carb. I have 525 s.c.'s that are stock. I know I will have to go up in jet size but not sure how much. One of my main worries is buying it, there is only one station in town that has it, and I have not seen it anywhere else. Never on a lake.

You need more than just rejetting. The engine needs to be designed to run it. It takes roughly 30% more E-85 to make the same energy as regular gasoline. It has a lot higher octane rating, but has less btu's.

E85 is really corrosive. If the fuel system isn't designed for it, you're gonna have a big surprise.

you will need a special carb, and changes to the fuel system, and no you can't mix with good results..Rob

E85 is nothing more than ethanol with a splash of gas. I ran a race car on ethanol and it was a whole different world. Essentially you have to double the volume of everything, since eth has a third less the BTU's of gasoline. Alky runs much better in forced induction applications- both because it takes more oxygen content to completely burn a fuel-air charge at 20:1 and since it burns cooler it can take advantage of high boost without detonation issues. To run it in a NA motor you'll have to go up to the 12:1 range on compression.

On a boat, you're going to have to figure out how to carry an extra hundred gallons of fuel to go the same distance you do now.

Thanks for all the info, That is what I had suspected, just wondered if anyone had tried it.