I have a suer tigre 2300 and i am having a problem with it. I cant get the top end to hold in vertical. I am running it on 15% nitro with a 18x8 prop it will run fine when it is level on the ground at full throttle but when i point the nose stright up it dies. I will die running rich or lean i have tried all diffrent needle positions i have checked the furl tank for air leaks and there arnt any. Anyone have an idea?

Put a smaller prop "16x8" on it until it has a few gallons thru it.

Check your settings and richen a few clicks, may want to go down to 5% or 10% at the most on nitro also (not saying this is the answer)as the big Tigers like lower nitro. Those engines want a long break-in as well so just fly until well broken in. Go to the manufacturer forum (on here) for Super Tiger and do a search for that engine and I am sure you will find that question and answer there.

Dont even think about it guys! But you have too much prop. I run 18's on 3250's

We have a CAP 232 from Hangar 9, it has a 2300 ST in it, we could not keep the engine running strong and consistently untill we used 10% fuel and it is doing much better.

If your running an aftermarket muffler such as a slimline, bisson etc, you don't have enough tank pressure. Block up one of the outlets and that should solve your problem. You are running the suggested breakin prop so I doubt thats the issue here. Make sure your running rich on the ground using the pinch test or a tach. A good test is to point the plane straight up when on the ground at full throttle if you can. should hear an increase or no change in RPM.

Also I would run 5% in that motor. Thats all it needs.

Ok i tried a 14x6 apc prop i had and the RPM note increased dramaticly. It also had a ton of power when nose was up. So should i go with a 16x8 for arobatics or should i stay with a 14... the 18x8 sounds like it is too much and it bogs down the motor

I've got 2 of these motors. An Italian and a Chinese. They both run great. They do not like a 18/8 prop. Too much. Bogs them down and they tend to go rich and lean in flight. You can't find a needle setting. I've flown them on a big Balsa Nova. On that I use a 17/10 APC. You might think that if it swings a 17/10N apc alright it should be OK with a 18/8 but all the 18/8s I've seen have way more blade area than the 17/10N APC and give up about a 1000 rpm. Even though the instructions for these engines say 15% nitro is OK both of mine run poorly on it. I run 5%. I use the stock mufflers. Every one I've seen run with an after market muffler was trouble and the owner was sure it was just a bad engine and steadfastly refused to try the stock muffler. I'm sure they can be made to run on an after market muffler with a lot of fiddling to get the back pressure right Remember back pressure has a lot more to do with how the engine runs than just pressurizing the tank.

Denis

I like the APC 17 x 8n.

turbo

I'd probably like it too if I could find one in a local hobby shop. I hate to mail order that stuff but I'll probably try to get one the next time I order Pylon props.

Denis

What prop will work for great 3D??

Try adjusting your fuel nipple on the carburator so it is pointing at the rear engine mount bolt hole. Super tigers are funny about that. Had the same problem with a 90 and that fixed it without changing fuel. I agree an 18 is wayyyyyyyyyy to much prop

17x6 or 16x8, 17x8N would be good for 3D or aerobatics. The 14x6 is for 90-sized engines and way too small for this engine.

Sounds like your in the ball park now. Don't make 50,000 changes here or you'll never know what the fix was. Fuel, plugs pump this that. Stick with the prop issue. It can come down to what type of flying your expecting from the engine plane combo.

The 2300 is a healthy engine but it's not a 160, 1.8,2.10 and many set the 2300 up as if it was. Like installing it on too large of a plane with too big a prop.

Have you noticed that nobody has asked what kind of plane this is? This would also be a big help

It is a funtana X100 it is at about 9.6lbs w/o fuel I havent flown it yet all the tests have been on the ground and pointing the nose up i want it as close to perfect as possible before putting it in the air... last time i had one that wasnt set up perfect and it went into the ground so i am trying to avoid that mistake again.

18x8 may be a bit large, but it doesn't explain the symptoms here. I think you have a fuel draw problem. The engine runs great when the tank is level with the engine/carb. Whenever you point the nose vertical, the carb now has to draw fuel straight up the distance between the carb and the tank - and it is failing. Thus your ST2300 goes lean and dies. The needles setting doesn't seem to matter probably because the suction at the carb inlet just flat out cannot draw the fuel up.

How far back is the tank behind the engine? Is it up against the firewall? If it is, and you have to use an aftermarket muffler, then you probably have to resort to using a fuel pump. Still, I would put the stock muffler back on and first see if the engine runs good with it.

I've had Italian and Chinese ST2300s and they are all great engines . I still have two, one just came off of a GP Giles 202, and the other is earmarked for a 4*120. The common problem with the ST2300 boils down to the big ol' carb ST put on it. It's the same size as on the 3250 and 4500. It's an old hotrodder's trick for making big horsepower, but transition suffer. This engine is not a 3D engine, even with the stock muffler. For 3D you need instantaneous throttle response and crips fuel metering throughout the RPM range. The ST2300 makes a good sport flyer engine where you don't need to modulate the throttle constantly.

Soundmaster, as you can see everyone has a different remedy that may or may not work, probally won't work, so I am not going to jump in here and offer any more. I will tell you I have tried my 2300 on a 18X6 and it was too much prop then I went down to 17X6 and it is just right for 3D at 9000 rpms. The APC 17X4 probally would be good also but I haven't tried it. I have used many different nitro percentages 5%,10%, 15%, and 20% they all worked about the same for me with now noticeable difference in either one. The 2300 is a hard engine to get to run properly but once you get it dialed in it is a good engine for sport flying. If you are into 3D big time it can't compete with the Saito or YS engines.

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I think that a 14x6 is a bit light for this engine, but you have demonstrated that higher air flow through the carb improves things in that department substantially. Experiment with 16x8 and 17x6 props. That should give you more thrust while maintaining the beneficial high rpms for fuel draw.

My G2300 pulled an 18x8 well, but then we're back to the problems of using a suction fed carburetor. It is time that this old fashioned way of running glow engines went the way of the dinosaurs. Good luck.

Ed Cregger

I find it incredible that this thread has mentioned nothing about the barrell issue. The #1 drawback of this engine. I just did exploritory surgery this morning on my 2300, and found that it has the dreaded "dogleg" disease. Here is a thread on the "fix" for its issues. I will be doing work on the barrel this afternoon..... Greg

http://www.rcaerobats.net/STEng/st2300_barrels.htm

ok well thanks to all for putting in information to me about the motor. I guess what i will have to do is get it running well enough for flight and start experementing with prop size and fueltank placement and all other suggestions.... i got it to run well with a 16x8 and 17x8 apc... which were a whole lot lighter then the dynathrust 18x8 i had it turned well and i wasnt getting the fuel problem anymore so its a start. Now for 3D i think this motor will do well enough to get me starterd... i agree that there is no replacement for saito and YS but for a poor college students affortable is what i was after. I will post as i begin to get it in the air... and let you all know how it is going... i will also put up a video of it when i can for all who want to see some performance with this motor on the funtana 100 and i will make sure to give to all specs as well when i get it finally weighed and all. Thanks again to all for the help i would have been lost without it!

I was hoping to avoid all that but if you must (SoundMaster) go check out the "ST2300 Testing and Experimenting" thread here somehwere. Now I don't 3D but from what I have seen around here, many who do run light on the pitch. Maybe try the 16/4 etc. I think an 8 pitch is a bit stiff

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By golly, you are correct, sir!

I thought the folks that now own this engine straightened that out pre-production? Or is this a pre Chinese engine?

Now you know why I always include the text of the original message, when I think to do it. I can't remember what was said in the original post. Gotta go back and read it. You guys wait here....<G>

Ed Cregger

I own and fly a 2300 with no problems on an 18 x 6 or an 18 X 8 prop but I also use a perry pump and a OS "f" plug. It sounds like a fuel draw problem you have. If you are running an aftermarket muffler plug one of the holes as Volfy has stated or get a pump or better yet a fuel regulator. The pre Chinese carb barrels had problems, this has been corrected.

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Go back a few years and read the posts regarding using the G2300 for pattern flying. Lots of folks were using the 18x8 prop. Most were also using a resonant exhaust system (tuned pipe).

In fact, I think that our very own Dick Hanson (sp?) was one of the leading researchers in this group.


Ed Cregger