Engine Problem...no clue

[patrickvdb]

Hello,

I'm a beginner with Nitro (now, ok that's out of the way, so I can start to ask stupid questions)


I have a Raptor 50V2 with the stock TT 50 Pro engine in it.

I have some very strange problems:

1) in order for my engine to start I must set the low speed screw (inside throttle barel) to 3.5 turns !!! Less then that the engine simply won't start.
Although in raptortechnique it is stated that initially this should be set to 1.5 turns
My high speed thumb screw is set to 2 turns.

When I bought the engine (new from a friend who never finished assembling it)
it ran fine for a while without overheating (temps max 80degr C)
But yesterday I could not make it start anymore.
The low speed screw was even set to 6 turns. Shouldn't that be way to rich???

Anyway, 3.5 turns is the minimum I need to even start the engine now.

The engine is smoking, so it is not to lean (I guess). However, now I think the engine temp is getting high even when on idle (90degr C).

The trick on raptortechnique to setup the initial low speed screw by blowing into it until you hear a hissing sound I did and it comes up to 1.5 turn when I hear the hissing (as it should logically), but the engine does not start until 3.5 turns.

So, I totally confused on the tuning part now :shock:

2) If I unplug the glowplug electrical feed, the engine stops.... even after long time warming up.
Totally confused again???

Jesus, my other Heli is an electrical one (TT Titan E325), never had such problems with that one... Just switch on and fly.

Help, help.... I can't fly..... I need to fly.... If I don't fly.....I...I....:arggg::arggg:
I also fly paragliders, but the weathers to bad now....so then I fly heli's because I need to fly,

So please please help a totally frustrated, slightly going crazy belgian guy !!

[LAMAR COOLEY]

Hey patrickvdb
What up ?
Here are some things to try, It may resolve your problem.
Sounds as though you may have a air leak somewhere causing fuel flow problems
1.) Install new glow plug. When you remove your glow starter and the engine dies. It's time for a new plug.
2.) Also if you remove your glow driver and the engine dies it could a indicater that you are way to rich on idle setting.
3.) you could have an air leak, maybe in one of your fuel system lines, small unseen split or hole or cloged or deteriorated line some where.
4.) check the main tank and header tank ( if used) fuel pick-up line. It may have disconnected.
5.) your carb. could be cloged or restrickted.
6.) check and tighten up your engine head bolts and back plate bolts.
7.) check your carb. retainer bolt to the engine. If loose reseat the carb assureing the carb. "O" ring is seated to the engine.
8.) check your exhaust pressure line. It could be cloged at the muffler nipple.
9.) try setting your high speed needle to 2-1/2 turns open or maybe 3
With your current setting of 1-1/2 turns open on idle it should atleast start.
That's about all I came come up right now.
Perhaps one of the Helifreak engine professors may chime in with more or better suggestions.
I hope this may help in some small way
Regards

[moneypitvictim]

All engines are a little different. My TT50 needed close to 2 3/4 turns on the high end to run. About 3 turns on the low end.

Also sounds like you could habe a bad plug, or one that is not suitable. Either way, try a fresh OS no.8, or an Enya 3. I know no other plugs that work as well es the OS 8 for the TT50.

[WayneBrown]

No kidding, drop the engine and tighten the head bolts back up.
have had theis happen on three TT 50's in the past few months.
It just won't run with the compression leaking out.....

[im sparticus]

with the main @ 2-3 out the low will be pretty spot on between 3-4.5 turns out (the low isnt very sensitive) ps. for the tt50 rt recomends 4.5 turns out @ 300ft check his actually personal heli specs the one with the tt50 the blow thing is just to help you get it started its by no means a tuning aid.
just set your low with the pinch test and then your main with the 50% throttle hover and confirm it by checking the backplate temp after a hover and afew power climb outs (also paying attension to the usual smoke/responsiveness etc) and then repeat bet you will end up somewhere between the paramiters i posted above ps your mid will probably be to lean and you may need run the main and low a little rich to compensate or do the needle mod.
my specs before the needle mod were 3.75 on the low and 2.75 on the main, now after the needle mod im .9 on the low and 2.25 on the main 25% nitro @ sea level

[cobaltltblue]

I have a totally different route, How much fuel has run through the motor? I have noticed with my nitro experience super rich settings and still getting hot, combined with hard starting, the motor might be worn out. The needle settings need to be so rich to form a seal around the piston so it will fire. Just another thought.

[iher]

LAMAR COOLEY´s list is right. here are other possibilities:

1-Have you over heated the engine? by quiting in mid flight, emptying your tank while flying ( this leans the engine mixture) or setting it up too lean?

This might have overheated the engine and damaged , warped, scratched, or miss aligned the piston.
Depends on the engine, fuel oils, and temp. But you can permanently damage your engine with only one lean run.

2-Have you changed recently fuel type, nitro % or oil content?
This may loosen carbon deposits that may lodge somewhere else creating problems.

3-How old is your fuel? fuel absorbs moisture from the air and changes the fuel ignition properties.