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Thunder Tiger 30/50 Raptor 30, Raptor 50 Helicopters


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Old 05-28-2013, 10:57 PM   #1 (permalink)
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Default Muffler spits Fuel out of the Exhaust Pipe?

Hi,

I have a Raptor 30 V2 with a TT .39 engine. The engine starts up and runs good, but I get a fuel drip (and or) spray from the exhaust pipe no matter how much I adjust the rich/lean mixture on the needle.

Does anyone have any idea what might be causing this? I just put in a brand new OS #8 Hot glow plug.

Could this be caused by a bad ring on the piston? Or am I just not burning my fuel hot enough? I'm using 30% nitro fuel.

Thanks for any advice!

Joe
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Old 05-29-2013, 02:06 PM   #2 (permalink)
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No one has any ideas?
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Old 05-29-2013, 02:14 PM   #3 (permalink)
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You should have a good amount of both fuel vapor and smoke-this is normal.

Dripping is too.

It should run at full throttle, with a bit of a two to four cycle break, if you want it to last at all. The idle should be steady, and the transition from idle to hovering and full throttle should be clean.

I hear people running model helicopter engines (glow/nitro engines) at a screaming two-cycle (sort of like running a Cox .049) and these are usually the same people that complain their engines don't last.

If you manage to run it lean enough to eliminate the spray and dripping completely, you will soon be replacing the engine.

(Thunder Tiger .39's run quite well, by the way).
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Old 05-29-2013, 03:04 PM   #4 (permalink)
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Default Re: Muffler spits Fuel out of the Exhaust Pipe?

Ditto, all symptoms of a well tuned engine. The drip you get is usually oil residue, at least that is what I get on my Nitro cars on the bench. Can't tell when they are flying by at 40mph :-) .

This is probably different for heli's but I use the spit test on my nitro models. Spit on the head after flight and if it boils off instantly you are too lean. I got bored with one of my traxxas motors with the trade in program and tried to blow it up to no avail. I REALLY wanted to see a rod or crank break and punch through the crank case. Unfortunately (lol) the air filter broke and I didn't notice it and it sucked up a piece of sand and locked the piston.

Anyway, stupid story aside, if your engine is producing the power you need and running rich then you have a happy engine that will last. You can always lean it out a bit for more power, just make sure you are always dumping good smoke because this extra oil and fuel is what is cooling your engine.



Regards,

Steve

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Old 05-30-2013, 12:58 PM   #5 (permalink)
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So a small amount of liquid coming from the exhaust is actually normal for this engine?

Thanks for your replies. This is my first nitro heli, so I guess I still have a few things to learn about nitro engines.

Thanks!
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Old 05-30-2013, 01:23 PM   #6 (permalink)
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Default Re: Muffler spits Fuel out of the Exhaust Pipe?

Quote:
Originally Posted by JDFiend View Post
So a small amount of liquid coming from the exhaust is actually normal for this engine?

Thanks for your replies. This is my first nitro heli, so I guess I still have a few things to learn about nitro engines.

Thanks!
Yup, it helps cool the engine as well as make sure it's getting properly lubricated. It's a good idea to "drain" the muffler at the end of the day as well. Just tip it so the exhaust port is on the bottom side and let the extra gunk drip out. Will save you a nasty mess to clean up at home or in the car. I usually stuff a rag into the port when I'm working to avoid any excess spillage.

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Old 05-30-2013, 03:38 PM   #7 (permalink)
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You should see the puddle a .91 leaves if you let it run in one spot very long. Keep in mind Heli fuel is generally up to 20% castor oil. It doesn't burn and has to go someplace. It's the lifeblood of the engine and what keeps it from burning down. After a whole day of flying a nitro powered plank it'll be completly covered in oil.
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Old 06-09-2013, 09:58 AM   #8 (permalink)
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You can do the three second test, not scientific but will give you an idea if your to lean, you want to be rich if anything. To lean will kill the motor. Pinch the fuel line going to the carb like a garden hose when trying to cut the water off. Count one one thousand, two one thousand ect... It should cut out at three or close to it.
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