Re: Fuel and Lube Question

[smokeonthewater]

Okay, I suppose I’ll chime in here because I’ve used the fuels you are referring to. Okay, mostly in airplanes, and camping stoves, but my antique motors too.
I am assuming you are making this custom mix of fuel because you are trying to get something close to non ethanol fuel. Ask your aviation friend if aviation MOGAS is available at his field. It’s ethanol free, lead free, and 93 octane.
I’ve used pure Coleman gas in my ruddertwin and other Elto singles and twins and 16:1 oil. Coleman fuel (naphtha) is what marine white gas was back in the day. 50-55 octane and no lead. You’ll enjoy easy starting and a long (almost indefinite) shelf life as the fuel is concerned. I have not experienced abnormal combustion and cylinder temps are cool. It’s expensive, sure, but I hardly consume much despite all of my motoring. I don’t think I would feel comfortable using this fuel in my own in anything made postwar.
I’ve used pure 100ll in my 15 horse Johnson for seasons now, true, I don’t need the octane or the lead, which is significant at .56 ml per gallon, almost five times the amount found in traditional (leaded) gasoline . But it does no harm, either. In time you would expect to see spark plug and valve fouling ., my outboards have no valves, nor do they run long enough to see any accumulations of lead on the plugs. I might have run 30 hours in each fishing season. You might see some if you run richer than me, or for longer. The only additive in 100ll besides the lead to the best of my knowledge is an oxygenator, something an outboarder will only need "when knucklebusters fly" . The main advantage for me is it is available, clean and ethanol free fuel.
To settle the price debate here, if it’s free, it is the cheapest fuel. If you paid for it, it’s more expensive. If you paid for it in FISH, there is no possible way you could have paid more. 😆