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MGB,
I just do not see acetone as a viable additive because of the under the hood temperatures no matter how short the run to the intake, but it is your experiment.
Water/methanol blends add to the mass of the expansion gasses as well as cooling things down. How big a tank you have determines how frequently you need to fill up.
Nitro, in addition to being expensive, takes a pretty good ignition source to get a reliable burn. You may recall that top fuel dragsters (running mostly nitro, with a little alcohol blended in when they need to tone it down) usually run dual magnetos and still have ignition problems more often than they would like. I realize that you will be running a lot less of it, but still....
What indications do you have of improved fuel economy, if that is the objective? I am glad that you have an EGT gauge. At least that way you have a hope of "catching it" if things start to run too lean.
I must confess that I find your experiment interesting as it is not something that readily suggested itself to me as a means of improving fuel economy.
Please keep us informed of your results.
Cheers
P.S. The question I would ask about the plugs is whether you think the combustion chamber has a similar buildup of fouling? Are you using a capacitive discharge ignition system such as MSD? If not and you experience a difficult to ignite lean charge you might want to talk with their tech support people.
I recently spoke with the tech support guy at NGK/USA about some posts on a Canadian web site which had suggested opening up the plug gap and going a step colder. He said that was only recommended in Canada as they run a lot more alcohol in the gas up there. I do not know what change, if any, in the plugs might be suggested by the continuous use of the water/methanol mixture, but you might ask someone in the industry. Anyway, best of luck in your endeavors.
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