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Looking for fuel recipe for boat engine

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Looking for fuel recipe for boat engine

Old 02-07-2021, 10:44 AM
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Default Looking for fuel recipe for boat engine

Hi.Looking for a recipe for my deep vee powered by os max .77 vrm engine.I researched boat fuels seems 18% is the recommended oil percentage.i have methanol, klotz 198 synthetic oil, klotz castor oil (to protect against kean run) and nitro methane.I interested in sport boating so 25% nitro is fine.What is the proportions of ingredients and method on a per gallon basis.Any comments advice appreciated.Thanks

Old 02-11-2021, 11:58 AM
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32 oz nitromethane
20.5 oz klotz synthetic
2.5 oz castor
73 oz methanol

This will produce 1 gallon of fuel with 25% nitro and 18% oil consisting of 16% synthetic and 2% castor.
Old 02-11-2021, 12:19 PM
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Originally Posted by JPMacG
32 oz nitromethane
20.5 oz klotz synthetic
2.5 oz castor
73 oz methanol

This will produce 1 gallon of fuel with 25% nitro and 18% oil consisting of 16% synthetic and 2% castor.
Thank you.How did you arrive at these quantities? Is there a formula? What is your opinion regarding this blend for sport boating?

Old 02-12-2021, 08:05 AM
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I just multiplied the desired percentages (as a decimal, not percent) by 128, the number of ounces in a gallon. After I determined the quantity of oils and nitro I subtracted them from 128 to find the quantity of methanol.

I chose 2% castor because this is typical for an aircraft fuel blend. You wanted 18% oil and I made 2% castor, so 16% had to be synthetic.

I am not familiar with boat engines. 25% nitro is huge for airplane engines. They run just fine on 5% to 15%. Your oil content is the same as we would use in our aircraft engines.
Old 04-25-2021, 12:30 PM
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Is a person able to use regular airplane fuel in a glow or gas rc engine, and if so, what would the formula be for making a mixture of 30% ?
Old 04-30-2021, 05:56 AM
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dirkadeese- Do you mean avgas like 100LL? A gas engine for RC use will run with it, but they don't have the compression to take advantage of the high octane. You can't use gasoline in a glow engine as the carburetor calibration and ignition are wrong for it as are any orings.
Old 05-03-2021, 04:46 PM
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Boat engines should run a similar oil ratio as far engines. 70% castor/30% synthetic!! I run 20% total content at a 70/30 castor/synthetic blend and 20-30% nitro. This is the most ideal fuel I’ve used in my K&B and OS marine engines thus far. I wouldn’t run an OS on anything less than 50% castor 50% synthetic. The liner plating is very fragile. My Nova and Picco truck engines get 11% oil at a 70/30 castor/synthetic blend and I couldn’t be happier. Even a friend with Traxxas fuel noticed within 5 seconds of starting his engine on my fuel brew to notice how different it is compared to the swill he had been using.


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