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Old 03-17-2006, 10:42 AM   #41
Dave Holmes
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This has been good reading.

I just got an email from a friend who teaches Chemistry in high school. He is under orders to reduce the stock of all chemicals stored on school property, and dispose of everything that does not have an immediate identifiable need, or of which there is an excessive stock. Apparently he has a sealed 5 gallon container of Methanol and wants to "dispose of it" by giving it to me.

I was thinking that if I were to mix in the requisite oil (castor or synthetic) then cut it with 20% nitro fuel, I should come reasonably close to the 10% I usually run in cold weather, or even the 5% I have started using in hot weather.

Should cut my fuel costs for the season by a bit I think. The killer as I see it is keeping it capped and sealed against moisture.
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Old 03-17-2006, 10:54 AM   #42
Claude Paradis
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Methanol is easy to get.

Where does one get the nitro?

Where does one get the oil?
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Old 03-17-2006, 11:23 AM   #43
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You can probably get the nitro from a speed shop.

You can use Castrol synthetic 2 stroke oil. There are lots of Castrol dealers around.
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Old 03-18-2006, 07:41 AM   #44
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Re: cheap fuel

Originally Posted by plncrzy
Yup... likely not worth your trouble if you are going to run nitro... but when you are running asay a SUPER TIGER 3500.... these run GREAT on 0% nitro ... and so what the fellow in BC did with cheap engine oil mixed with cheap Methyl Hydrate.... it was a big saving..... especially when you look at how much fuel these big engine go through...... but when it comes to the smaller engines rewuiring nitro and needing/wanting good oil.... DONT bother
That is precisely what I'm doing. Wouldn't waste my time doing this for my smaller glow engines. Just using Castor oil too, not the drug store stuff either, but Sig AA Castor. This is what is known as FAI fuel, and the big cats like it that way.
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Old 03-19-2006, 01:52 PM   #45
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all you need is a buddy in the oil and gas industry like an operator ( thats a guy who looks after wells )
they us methanol to keep gas well compressor units from freezing and it is usualy 99% pure
they will usualy have a big tank beside the compessors
i got some frome one of those tanks and mixed up some fuel and seemed to work great
i didnt mix any nitro
i got about 20 L for free
its just who you know
getting nitro is a bit harder and the oil isnt cheep either
does anyone know of a substitute oil for castor oil
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Old 03-21-2006, 03:32 PM   #46
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I have been using Methyl Hydrate as well. The mix I havce used traditionally is

20% castor medical grade
77% Methyl Hydrate
3% acetone

I get a good run and a great idle with that mix....However, today was the coldest weather i have ever used it in, and i was bench running an older Thunder Tiger 25 that i had bought on e-bay. As it turns out, the engine ran, but with some difficulty. Starting was not a problem, but the engine was not building enough heat. If i teased the engine up to a high rpm by leaning the needle, and then setting it the usual way, it would run fine. Transition was good, but only if i ran it from WOT to idle, and then back to WOT without too much delay. After about ten seconds at idle the engine would start to sputter a bit, and then would not easily run to WOT. My theory is that a combination of my glow plug heat, and running 20% castor in the cold weather is causing excessive cooling of my engine. I also know that when i let it idle for ten secs and it starts to sputter that there is an excessive amount of unburnt fuel/oil exiting the exhaust. I think i will try a different glow plug, and reduce my castor by 2-3%.

Other than today, methyl hydrate seems to work fine. But I am interested in hearing about how i might "damage my engine"
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Old 03-21-2006, 04:19 PM   #47
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Jon_beks.....What is the purpose of the acetone? Do you consider that to be a substitute for nitro? Nitromethane is getting hard to find and I would very much like to have a substitute.
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Old 03-22-2006, 05:37 AM   #48
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There is no substitute for nitromethane, sorry to say. Or at least, none that i am aware of. Additions of acetone up to 3% seem to greatly improve idle and low end transition. It is not necessary in the mix, but I find it a worthwhile improvement.

Today I am heading to town and I'm going to pick up a few different types of synthetic lubricants. I think it will be interesting to see which ones will be compatible with our glow engines. I remember speaking with a gentleman about ten or twelve years ago, and he told me that he used to purchase bananna oil from a local health food shop for making his glow fuel. It seems that the oil was an adjunct that enabled a less expensive mix oil for common gasoline engines to stay in suspension in the methanol.

Anyhow, will let everyone know how it goes.

Jon Beks
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Old 03-22-2006, 03:32 PM   #49
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a new oil from crappie tire

Interestingly enough...I have looked at the 2 stroke oils at crappie a hundred times and never saw this one. I assume they just started carrying it, but I could be wrong. The oil is called "Red Line Synthetic Oil".. It is a polyol ester like what is used in turbines, and is supposed to be compatible with methanol. The cost is 8.00$ for 1/2 litre. And methanol at crappie is 10.00$ a gallon. Not really any cost savings, as far as i can see. I did find some castrol and Mobil 2 stroke oils that are not synthetic, but i think i should find a very crappie engine to test these on..What about it? Anyone have a sacrificial lamb they would like to donate to the cause? Was thinking that a few pics of the sleeve and piston and crank/conrod, + careful measurements of everything including compression before and aft on any old motor should provide a reasonable baseline for future testing. Maybe try mixes of all sorts of cheap oil alternatives. I don't have a motor free to do it, but i'm interested in the idea....any thoughts anyone?

BTW, will post about how the syn oil I bought today works out, tomorrow.
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Old 03-22-2006, 04:42 PM   #50
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Cheap source of methyl hydrate

Check out your local drug store they used to carry it
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