The Katana has the 23.6cc Echo that I did all the hop up mods to, including the stroker crank mod. Turns an APC 16 x 8 at over 9000 rpms. I don't think it will hover with that much pitch in the prop in this combo, but when I pull it to vertical it gets really small, very quickly...

The first post at the beginning of the previous page has info on the Super Tiger .90. It had been modified by Keith at BME to run on a regular gas/oil mix with roller bearings. I chose to run it on Gas/Glow. It runs and handles super, but see the post above for more info.

48cc twin? See here: http://www.rcuniverse.com/forum/m_5422664/tm.htm

AV8TOR

Wait Wait Wait, you can't do that.

You have the twin all set up and you not going to mention the numbers.

At least talk about it a little.

Just finished making the mufflers and bolting it onto the test stand last evening. Might take it outside and start breaking it in today if I have the time.... Cool looking engine huh?

AV8TOR

I can't wait until I get mine going.
I am also going to run mine on gas glow.

I have found that not all 23.6 Echo’s are created equal.

I have one off a string trimmer and one off a hedge trimmer, the ports are smaller on the hedge trimmer.
So the search goes on.

Keep us informed.

The older 23.6cc Echos had the larger ports. I believe they were made in the mid 90's.

Here's my new twin 23.6cc engine running 10 minutes ago.

Started on the third flip. Runs so smooth you can't even see the gasoline in the tank jiggle or feel any vibration at all on the test stand. It's only got 10 minutes on it, and no fine tuning, but already turns a big old 20 x 10 wide blade APC at 6500 rpms... After about 25 minutes of easy running, I shut it off, and it restarted on the second flip of the prop. Yep, I think I'm going to like this one!

I think I'm going to build another one with 25cc crankshafts, some port work..... oh boy, here we go again!

AV8TOR

Any other place besides Wacker engines that sells the spark to glow plug adapter? Trying to decide if I want to just buy that or attempt to convert a spark plug and tape for glow.

Horizon Hobby has them also. It's a Zenoah part. I've made a few, and for the 10 bucks they cost it's just not worth the time.

AV8TOR

Thanks for the tip.

One last question: Do these engines run on regular gas fuel tanks and fuel lines? Not sure if the glow in there would harm or destroy gas equipment.

Nope. Can't use silicone and other "glow" materials for gasoline. The hobby suppliers sell a rubber stopper for your fuel tank, and the lines need to be either rubber, plastic/vinyl, or Tygon tubing. Gasoline turns silicone to jelly. Tygon is the best. Next best is rubber. Plastic/vinyl works but will stiffen after a while exposed to gasoline.

AV8TOR

AV8TOR,

Oh, man, that is sweet. What a marvelous design. Totally symetrical and professional in all respects. Carb on top in the center of the case. Opposed cylinders with the plugs up top. Mufflers pointing down. Please, can we see this thing run on YouTube or RCU video?

Hi,

I'd love to but sorry, don't have a video camera. [] It sure sounds sweet and runs smooth.

AV8TOR

Awwwww,

Guess I'm gonnna have to build my own.

Go for it! It's a neat engine.

AV8TOR

Hi Bob!!!
I envy you buddy, that sure is a sweet looking machine.
Are you running this beauty on gas/glow? with the same proportions?
how much do you think I would cost to build one, I know that is difficult to say but a ballpark figure, I would like to build one but dint have the technical skills or knowledge to do so, I'mm thinking on purchasing a Smithshop mill/late and start learning to do machine work with the help of my flying buddy he knows how to work the equipment, but that's another story. so congratulations on your project it sure is "SWEET" where it's it going to go on?
Bill.

Hi,

If Keith at BME still has any, he was selling the crankcases for $40.00. Really cheap! The rest of the engine is based on two Echo 23.6cc egnines. So whatever you could scrounge a couple of those up for....

Yes, I'm running it on the standard Gas/Glow setup we came up with, just like my other engines. At least for now, I think I'm going to put it on my Giant Big Stik. Later, who knows? Maybe on an Extra, or my SR Batteries giant Eindekker. (How's that for a spread?)

Thanks for the compliments. I am proud of it and happy to have it.

AV8TOR

Check BME for the echo crankcases but didn't find them. How can I find out if Keith? has anymore. I would really like to get one of them.

Oh, I was sure it wouldn't work with glow stuff, I mean regular gas fittings Didn't know if there was something else out there special to get, thanks for the clearing up.

By the way, I want an Eindecker more than just about any other plane that has ever existed. My vote: Do the E.III! Just imagine the sound and the honkin' big prop. Chilling.

Yeah, but I've got a Honda GX-31 four stroke engine set aside for the Eindekker.... With a straight pipe on that four stroke, I'm thinking that will sound great too. The problem is, being the "power hungry dog" that I am, I'm afraid it's not going to have enough power for me.

So, maybe the twin... we'll see....

AV8TOR

Ahh, well, the lower power engine would be more scale flight wise. In lieu of this new information, I change my vote to save the E.III for the Honda I want a video, when you make it. Love that sound!

Hi Bob!
Well finally decided to run the MAGNUM 1.80 on gas/glow with 10% oil with is normal glow carb
It ran very well but the setting point was very sensitive, the other thing I've noticed was that it ran hotter tan with glow, do you have any idea? maybe more oil, my buddy is making an adapting plate for a walbro carb then I can try it again and see hot it works, it ran very good but if you go over just a nick on the needle valve it will stop (overheat). any input.
Thanks.
Your Buddy down in Baja.
Aero Nut.

Well, the Walbro carb will cure the sensitive needle issue, but the overheating could be a problem. Gasoline burns hotter than alcohol and the Magnum is designed with that in mind and has less cooling area. A little more oil will help, and a richer carb setting. If it persists, you might add some head shims to lower the compression. See how it goes. Really, if you are going to run an engine that needs a lot of oil anyway, you might just as well run straight methanol and oil. No advantage to "Gas/Glow" in that case really, except for the small percentage of nitro. Alcohol costs about the same as gas now anyway.

Good luck,
AV8TOR

okay.... so if some one could simplify it for me, i have a poulan 46, and some 20/20 fuel. so all i need to do is mix the two in a 75/25% gas /nitro mix,(some tweaking aside) get a plug adapter, and run the stock carb and i'm good to go?? getting the heavy flywheel off and freeing up the space would really boost the potential.. ive had a truck idea in mind for a long time but couldnt get past the flywheel getting in the way... so maybe somebody could steer me? yes? no? almost? i cant read a monitor for more than a page or so or i get sick....(really)[:'(]

The correct blend is 33 1/3, 10/10 glow fuel 66 2/3 Premium gas.

The 46 Poulan I believe is out of a Chain saw.
It is a high performance engine and the extra Nitro would not be good.
The extra oil shouldn't be a huge problem, just messy.

I bought my 10/10 mix from Tower Hobbies. You can buy just a quart and there is no hasmat fees.
That will give you enough fuel to play with to see if this is for you. And it should be.

I found this guy, http://www.genebarton.com/. He has adapters for $6 or $8.
I just ordered from him the other day and have not seen his product yet.

For me the switch to Gas / Glow was very easy.
Tuning was very simple and most people think it's simply a glow engine.
No problems with Walbro carbs breaking down. I guess there isn't enough Alcohol to mess with the diaphragms.

Good Luck

My Poulan 42cc works great on our standard mix of 1 part 10% oil & 10% nitro glow fuel to two parts high test gasoline. However, it does have a slight drop in rpms when removing the glow plug heat, (battery), which indicates it actually could use a touch more nitro in the mix for this particular engine. Since I don't want to run more than one mix in the five planes I have flying on Gas/Glow, I just don't worry about it. It has plenty of power!

The Poulan is on my Giant Big Stik. It rolls about 30 feet on take off, and I then pull it to a 45 degree climb. Once I get about 30 feet high, I pull it vertical and it just keeps going.

AV8TOR

Finally have my private pilot license done and this week in Kansas will be the last one for some time, so I will have more time to put my ideas to work.
What I'm thinkng is getting back to original subject in this thread - see the first post: "running gas engine on the regular gas fuel with the glow plug". I mean no methanol at all. To remind everybody, who didn't read this whole thread, the only reason to mix methanol with gas is to keep glow plug hot during compression (catalytic reaction). The same effect we can achieve by running current through the glow plug (glow starter). However the problem is, that gasoline is burning so hot it overheats the glow plug's coil and break it (often after less than few hours of flying time).

So here is my new idea. To keep the glow hot all the time I'm going to use on-board glow starter. However most of known starters use just on-off switch based on the throttle position. I want the circuit that would regulate the temperature of the glow plug all the time (by measuring the resistance) keeping it at the desired level. This way I should be able to use much less power during the run and not overheat the glow plug at the same time. My previous experiments proved that the remperature can not be used for controling ignition timing (it is more like on-off), so the temperature range is not very critical. Just to keep enough temperature to have engine running but low enough to prolonge the life of the coil.