hi guys,
i am new to this hobby and i am trying to find out technical tips.
you are using this fuel :
1 part 10% nitro, 10% oil glow fuel to 2 parts of pure high test gasoline. (Not Premix; no oil)

you are using this fuel to glow engines that you want to convert OR to gas engines ?
can i use it to a glow engine?


i tried to read all the forum but i am not a pro and i am a bit lost.
thanks very much

The 10/10 glow fuel is only good in engines that have real bearings not bushings.

You can still run gas-glow in glow engines but you must maintain the manufactors recommended
gas oil ratio.

In other words you would need to add more oil to the mix.

That was the 1st fuel I ran. Worked great. you can get it in 10% too. I got mine from my lhs. I did not have any probs with the castor mixing.

Paul

Well, I’m thinking of trying the gas/glow setup on my Poulan 42cc. I have a few questions though:
1. Will my Hot Shot 2 glow igniter that I use for all of my glow engines work? It twists and locks on to the glow plug. I want to make sure that I get a glow plug adapter that will allow the igniter to fit and lock on the plug properly. Is there any difference in the adapter from Horizon or from genebarton?
2. I’ll use an OS F plug. Should I expect it to foul out during the first break-in/tuning runs? If so, I can dig up some used plugs, mostly OS A3 plugs that still work, but don’t give optimal performance anymore. Would this be OK? I would hate to quickly foul several OS F plugs as that would be costly.
3. This engine currently runs great on magneto ignition with the stock 11.11mm carb and stock muffler. It tachs around 7700 rpm with an APC 18x8 wide prop. Should I open the needles any before trying to crank it on the gas/glow mix? I’ll try to find the 10/10 glow fuel and mix it 1/3glow to 2/3high test gas like AV8TOR and others keep recommending.

plasticmaster -- I ran a Poulan 42cc on Gas/Glow with very good results. You will need to open the needles a to richen the mixture for Gas/Glow. Try one full turn open on both needles. This will likely be very rich, but it should run and then you can start tuning. Yes, I have found that a new or rebuilt engine will often "use up" a glow plug while breaking in. (First tank or two of fuel). I also use a cheap or old plug to break in my engines. I believe your glow connector will work. I use a Dubro connector on mine. You will probably see a small gain in power. I generally see from 150 to 300 rpm gain when switching to Gas/Glow.

I had a gutted, free flowing stock muffler on mine, and a 13.5mm carb, and it turned the same prop you are running at 8400 rpms.

MikenLapaz-- I don't think the added nitro you mention will lower the methanol content enough to be a problem. The only caveat is if the added nitro would cause detonation. It all depends on the given engine and one wouldn't know without testing. Nitro generally gives more power and better idle and throttle response, IF the engine can run it without detonation. If you run into detonation, you might try a colder glow plug, like a two stroke plug. If you have the normal mix, here's one way to get an idea if the motor might support more nitro without problems. When the engine is all properly tuned, warmed up, and the mixtures set just right, see what it does when you remove the glow plug power. If the engine drops in rpms, it can probably take more nitro to good effect.

AV8TOR

Hey all an update on the 4 cycle. A change to a WT (miserable WY!!) got things rocking and rolling. Turns a 18x8 7400+, cranks easily and idles very nicely @ 16-1800rpm. It does need the plug lit at idle. It is a smooth runner, now I need something to put it on.

What is the total weight of your Ryobi? Dumping magneto, coil and spark plug must loose at least 1 lb, right?

Hey RysiuM, yeah it has lost a pound, the engine, carb, exhaust and prop hub (basic engine) weigh 57 oz. Ready to fly weight is 68 oz. That is with a MS Classic prop (heavy) Hangar-9 metal motor mounts and large metal spinner nut. With the mag it weighed over 5.5 lbs. The 25cc Homeys make as much power with much less weight, but the 4cy. is pretty cool! The sound is great! suprisingly not very loud with a straight pipe. I think it has the torque to probably turn a 20" prop, that would be cool for 25cc!

I think you can....but if the engine does not have needle bearings on rod...you may need more oil. Check with AV8TOR....he is da man!!!! Capt,n

!!Just finished reading the entire 84 pages of this thread!! A pat on the back to all you experimenters for fine tuning the mixture and solving all the problems.

I have a question for you engine experts out there. Disregarding the cooling effects of the high percentage of oil and the oil needed for the bushed con rods, how much oil is really needed for the piston and rings on the smaller (40 - 120) glow engines?

The recommened amount of oil must be maintained.
Some large Super Tigre only need 10% other engines need 18%.

If anything the extra heat from the gasoline would require more oil in a bushed engine.

I understand that I need the 10/10 glow fuel. I went to my local hobby shop yesterday and they don’t have this fuel and refuse to order it. However, they have Powermaster 20/20 fuel for YS/Saito engines. I have access to methanol from a go kart shop and can mix it 1:1 to obtain my 10/10 mix.

They also have a quart size bottle of car fuel that is 20% nitro and 10% oil. I have 4 gallons of Omega fuel at my house that is 15% nitro and 17% oil. If I take 100 units of the Omega and add 70 units of straight methanol, I get a mix of 8.82% nitro and 10% oil. If I then add 20 units of the car fuel, this gives me 190 total units of 10/10 mix.

Could someone check my math and make sure I’m calculating the mix correctly? Also, is one method better than the other since they both arrive at a 10/10 mix? I’d like to make use of the fuel that I already have to keep my cost down. Thanks.

The car fuel is 20 / 10 I you add to it you will bring your oil down. You can get the car fuel at 10/10. That is what I run in my planes

Paul

Just mix your 15/17 omega with methanol as you propose 100 units of glow fuel and 70 units methanol and mix this fuel with gasoline at 2 parts gasoline 1 part your mix this should give you a 2.9% nitro and 3.3 % oil mixture which is close to the 3.3%nitro and 3.3% oil obtained with the 10/10 fuel and forget adding the 20/10 car fuel.
This should work great with the conversions because we dont need alot on nitro in them because of detonation.

Aero Nut, if I loose rpm with this mixture when I remove the glow power, would I benefit by then adding the 20/10 car fuel to the glow portion of the mixture to bring my nitro level up? This should keep the oil of the glow part of the mix at 10%, right? I'm thinking back on AV8TOR's experience with his Poulan 42 and his reports of loosing rpm with glow power off. I'll try it as you say first, since all I have to do is purchase some straight methanol and high test gas. For the gas, do you use the highest octane you can find? The highest I can get is BP93 (93 octane). Thanks for all the help.

Aero Nut or AV8TOR, have either one of you Guys tried a no Nitro mix? Maybe the kick back and running back-words thing would go away! Just wondering? Capt,n

That doesn't answer my question. I am asking about the piston rings and cylinder. I understand about the bushed bearings on the con rod and the cooling effects of the oil. I am curious about the lubrication required by the piston, rings and the cylinder.

Hey all, tried the 4 stroke on 50/50 gas/glow really runs well with that ratio. Concerning glow motors with bushing. I just converted a ST-3000 to gas with EI. I have been running 25:1 mix with Klotz. It has several hrs. on the stand with no problems. ST oil is 10% (12.8 oz/gal) 25:1 is 5.12 oz/gal. It so far has had no problems. I did open the original 2 oil holes 1 drill size and added a 3rd on the side of the rod that is opposite rotation (leading side). Gas is a lubricating fuel. methanol is a "dry" fuel. maybe the lubricity of gas offsets the reduced oil. I am going to put the 3000 on gas glow, now I have to make a glow plug adapter since I drilled the head for a 10mm spark plug. Jokes on me!

The piston ring and liner will be OK at 50:1. Ken Lambert at Lamberts RC and Keith Baker at BME have converted SuperTigre 90's to needle bearing rods and they are fine at 50:1.

The bushing rods are the only thing that need the extra oil although with straight gasoline I have cut that down to 16:1 which is about 6.2%. I have been planning to cut it back further to 20:1 but it is running so good I hate to mess with it. My current project that I am refering to is a SuperTigre 51 on spark ignition.

Guys I hated to talk about sparkers on your gas/glow thread but I felt it would help him understand where my answer was coming from.

Thank you. That is exactly the information that I was looking for. To explain what I need this information for, I am experimenting wit using gas/glow on a 4S engine. i am experimenting with a sealed crankcase with oil injection for bearing lubrication. I have already run gas\fuel in an old Saito 45 with success and hand injecting oil into the crankcase.

I was just wondering the other day why they don't make the four stroke model engines with an oil control ring, and a crankcase with oil in it lubricating by the old splash method. Is there a reason I'm not thinking of??

AV8TOR

Inverted flight??

hamaoki: Is it best to inject the oil into the bearings and let it fly off and then lube the rest of engine or is it best to inject oil right into intake passage way? Just kinda wondering what you have found out so far. I suppose a lot could be learned from motorcycle and boat motors that used oil injection! I was too thinking of using oil injection...but never tried to do it yet! Best Regards Capt,n

I have a ST-3250 I been thinking about selling.
What kind of numbers are you getting with your 3000?

I tried the ST-3250 on gas glow with the extra oil and a walbro carb,
but was not impressed with the way it ran.

Actually I was never impressed with this engine on glow, diesel or gas-glow.

most planes run what they call a dry sump. The oil is in a tank and pumped in and out of the engine. That way when you are in a climb the engine will have oil. and if it is up side down. To do it with a RC it would be a pain in the butt.
Paul