Modify fuel or not
 

Hi Guys,

My Super Tigre G3250 (32cc) loves correct fuel; 13% oil, 10% nitro. My problem is that I can't always get ST fuel.
Does anyone recommend adding alcohol to a gallon of standard glow fuel? Oil content is higher for this type fuel and makes the Super Tigre run crappy not snappy. As I undersand it, regular glow fuel for planes has oil contents of 16%17%. Any tips for fuel mods?

Regards, Scott

RE: Modify fuel or not
 

Go buy some methanol from a speed shop. It's cheap. Then see if they'll sell some nitro. Then just mix it up to get the oil and nitro content where you want it. I'm thinking of doing the same for some Omega I have. I want to add enough methanol and nitro to get the oil to 15% and keep the nitro at 25%.

RE: Modify fuel or not
 

Great advice, I know of several speed shops where I could get Methanol. I'm going to pick up some beakers and make my own fuel ; buy an RPM gauge and experiment. Might even whip up something special for my kids dirt bike.
thanks, Scott

( sorry for posting in wrong section too)

RE: Modify fuel or not
 

5 cups of methanol added to one gallon of 15% nitro/17% oil fuel should yield fuel with 13% oil and 11.45% nitro?

RE: Modify fuel or not
 

It isn't the methanol thats expensive. Thats only $2 or $3 per gallon.

Nitro isn't even all that expensive when you take into considferation that it takes just a few ounces to get 5% in a gallon of fuel.

It's the OIL that usually causes heart attacks when people start adding it up to mix their own fuel. Don't you need somewhere in the neighborhood of 16--20oz of oil to make up a batch with around 15--17% oil?

Obviously, if your only going to run 10% or 12% oil you will be using less. Somewhere around 8oz of oil?

Still--price the oil before you jump in with both feet and start mixing your own fuel. It's not as cheap as people think. Not around here anyways.

I always ran Omega 5% fuel in my big ST engines. It's 17% total oil. It's 70% synthetic and 30% castor. I like that combination in most glow engines, so I decided to run it in my big ST engines too. All I did was run 2 head shims. One .005" and one .008" I ran a generic medium to medium hot plug.

You can get away with running higher oil content if you just shim the head a bit to drop the compression. The higher oil bumps up the already high compression ratio so much, they will start to detonate a bit on long full power runs.

Just slap a couple head shims in there and make life easy on yourself. Buy some regular old stock fuel instead of making life hard and complicated. The extra oil isn't going to hurt your rod bushing. And it's not going to hurt your ring either. Bearings will love ya for it.

RE: Modify fuel or not
 

You're on the ball, I did the math, adding 49.23 oz ( close to 5 cups) to 1 gallon of stock 15% nitro fuel would cure my oil woes and at the same time give a little more punch. This works out better so I can share my fuel with others at the field too. Great tip.

RE: Modify fuel or not
 

"Ounces"? "Cups?" What other strange measurements do you guys use :D? It took me about 2 years to realise what your ounces were...now I've got to figure out cups. D cup maybe? :)

RE: Modify fuel or not
 

Hi!
Yeah! When will they ever learn... Liter, kilos...so simple the world would be...:)

RE: Modify fuel or not
 

Don't forget Teaspoons (t) and Tablespoons (T)

It's easy to remember how much is in a cup. Why it is half a pint.

Don't forget that a gallon of fuel weighs less than a hundred onces but contains 128 fluid onces

RE: Modify fuel or not
 

Don't you love it when folks (blokes) that drive on the wrong side of the road start giving us static about our measurement techniques?

RE: Modify fuel or not
 

Jan, I would like to go to the metric system, everything is ten times something or one tenth of something else. I got all excited in the mid seventys when the state of Ohio put up metric distance and speed limit signs, people whined so badly that they soon took them back down. Oh well. I've had metric tools since I was kid, we should still convert. We use a sytem that isn't related to anything (except some old English guys foot maybe) and makes no sense because of it.

RE: Modify fuel or not
 

I agree 100%!

RE: Modify fuel or not
 

1 Cup = 236.5882 Millilitre.. :)

Jens Eirik

RE: Modify fuel or not
 

OKAY

So if I have a firkin of fuel with with 7 flagons of best oil I need to add how many british gallons of methanol for my ST 3000??
when a:
Noggin = 1 Gill
Gill = 1/4 Pint
Nip = 1/4 Pint
Small = 1/2 Pint
Large = 1 Pint
Quart = 2 Pints
Flagon = 1 Quart
8 Pints = 1 Gallon
Firkin = 9 Gallons
Anker = 10 Gallons
Barrel = 36 Gallons
Tun = 216 Gallons

From the days when arithmetic was WELL HARD. Anybody know how many handles in a pipe. [ One for you DownUnder ]

RE: Modify fuel or not
 

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Ever since my first venture into the metric system via electronics, I hae felt the same way, Dave. But whatcha gonna do? <G>


Ed Cregger

RE: Modify fuel or not
 

It's folks who drive on the wrong side ot the road who invented our screwed up measurment system.
We were ahead of them when we went to a metric monetary system. I guess Ben should have tried harder, but lost credability by backing the turkey.

RE: Modify fuel or not
 

The fuel mixture calculator enclosed below will help you with calculating how much methanol and nitro to add to your fuel.
The file is an Excel fil in disguise. Right click on the link below and save it to your hard disk using the name homebrever.xls

Good luck with mixing your fuel!

/Red B.

RE: Modify fuel or not
 

LOL.

Then, to make it even more difficult, many of these units are broken down not into decimal points but fractions! "Make it 17/32nds of an inch wide"!


I agree 16/16ths!