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HelicopterMain Discussion › Why does my Heli keep hot starting???
04-30-2004 09:01 PM  13 years agoPost 1
mikefoy6

rrApprentice

Thief River Falls, MN

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i have been having a problem with my heli. On inital start, it fires up fine and idles great. but after refueling it has been starting at about 70% throttle.

sequence of events that cause problem:

1- land heli, spool down, kill engine w/ throttle cut
2-pinch fuel line to carb w/ fuel shut-off clip
3-refuel by pumping fuel through header tank first.
4-unclip line to carb
5- glow starter attached
6-start engine
7-jump away b/c it tries to spool up (yes, i hold on to the head- but i hate replacing clutches)
8- press the throttle cut- but no response b/c carb is already closed. runs for 10-15 seconds (at 70% or so), then quits.
9- wait a bit, repeat steps 5-6, and engine idles fine again.

my curves or ok b/c i can see the negative pitch on the blades and it idles fine on the first start

my fuel line is all less than 1 gallon old

i am positve all trims were ok and that i was not in idle up mode.

i can see that the carb is fully closed too.

please help me figure this one out.

mike

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04-30-2004 09:09 PM  13 years agoPost 2
Twobeers

rrKey Veteran

Toronto, Canada

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Possibly, perhaps, maybe when you are shutting down by pinching the fuel line closed you are introducing a air bubble in the fuel line or fuel passages at the carbourator.
Or your low needle is simply to lean.

I lost my infamous tag line.

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04-30-2004 09:19 PM  13 years agoPost 3
zapster

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Vantaa, Finland

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If you have the TT pro 50H engine the head end backplate screws might be loose!

I had the screws loose and run a gallon of 15% CP through it and you can just imagine what the engine looks like now from the inside!


-Z-
TT Raptor 50V2 SE
Futaba FF9
Futaba 601 + 9251

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04-30-2004 09:51 PM  13 years agoPost 4
Allora

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North East, NJ

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Try this.

Try stopping the engine with your throttle trim instead of pinching the fuel line, and see if that makes a difference. If it still happens it would eliminate a problem with the way you are pinching theline, such ac introducing a bubble etc.

-Lou

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04-30-2004 10:35 PM  13 years agoPost 5
comet

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Neuilly sur Seine, Fr

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your step 8 gave me a clue...

you say your carb is closed, but engine is still runing (hot even...)
so air is still getting in there (as if carb was 70% opened)

I'd check that your carb is properly fitted to the engine
in a general way, that there is NO AIR BLEED/LEAK at the carb slot


PS: when you say your carb is closed, it's not only because you are downstick; it's also because you are sure that you carb and throttle servo travel are free. (and you even saw the carb arm at the idle position at step 8)?

VT "slow&low"

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04-30-2004 10:38 PM  13 years agoPost 6
mikefoy6

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Thief River Falls, MN

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1- land heli, spool down, kill engine w/ throttle cut
i am using the throttle cut to kill the engine. not pinching the fuel line.

also, it is an OS 32


@comet- yes im sure the carb was closed b/c i saw the servo move it all the way.

mike

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04-30-2004 11:12 PM  13 years agoPost 7
rwj

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Kenosha Wi

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Is your throttle arm tight.

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04-30-2004 11:19 PM  13 years agoPost 8
mikefoy6

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Thief River Falls, MN

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yes- im sure my throttle arm is tight

in fact i just put this on the other day

http://www.heli-world.com/Merchant2...&Category_Code=

mike

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04-30-2004 11:28 PM  13 years agoPost 9
brian chan

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Hong Kong

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You use a tune pipe ??
Have you check the quality of the glow plug ?
Is the Carb firmly attached to the engine ???
Is there any minute-cracks on the body of the engine which you do not note it / them ?

High throttle start, damage glow plug per every flight, too hot engine with over heat "liquid boiling sound", engine with a very minute 1 cm crach, all the above were my previous experience of my os50 with hatroi 540 pipe.

How old is your africa grey parrot, the one shows in your gallery ?

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04-30-2004 11:50 PM  13 years agoPost 10
mikefoy6

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Thief River Falls, MN

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the glow plug that i am currently using is less that a 1/2 gallon old. i did just add the century torpedo speed muffler though. i will have to check how secure the carb is to the engine, as that sounds like it could be the problem.

@ brian chan- She is about 7 years old. still a kid when you consider
that she will live to be 80+ years old.




mike

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04-30-2004 11:54 PM  13 years agoPost 11
Bubzilla420

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Central Illinois

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sounds like an air leak to me, tear it down and permatex it .. I have done this with many car engines.. works great.

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04-30-2004 11:56 PM  13 years agoPost 12
Bubzilla420

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Central Illinois

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hey ... is that a Timney? or a Congo?... looks like a Timney..
They can talk up a storm.. but anyway... Permatex

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04-30-2004 11:57 PM  13 years agoPost 13
mikefoy6

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Thief River Falls, MN

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Permatex???

i am not familier with this

could you please elaborate....

thanks
mike

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04-30-2004 11:58 PM  13 years agoPost 14
mikefoy6

rrApprentice

Thief River Falls, MN

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@bubzilla

She is a congo...

a little bit larger than the timney.....
with a red tail too

mike

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05-01-2004 12:00 AM  13 years agoPost 15
Bubzilla420

rrNovice

Central Illinois

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you can pick it up at Auto Zone or an auto parts store ... it is Gasket Goo... comes in a tube.. you want the blue high temp stuff... put it on and let it sit for a day..


http://www.permatex.com/

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05-01-2004 12:01 AM  13 years agoPost 16
Bubzilla420

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Central Illinois

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Ya my Grandad had one for years... mean bassturd though.. but she could talk like a human

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05-01-2004 12:23 AM  13 years agoPost 17
Ninjak2k

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Centreville, VA

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Give a blip or two of your starter without the glow driver attached to get more fuel into the engine. Don't flood it, though. Should be too rich to run so high at that point.

~Dan

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05-01-2004 02:45 AM  13 years agoPost 18
mikefoy6

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Thief River Falls, MN

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well- i checked my carb, and it is very securely attached to the rest of the engine. so much for that idea . i thought that it would have been it. its the only thing i had not checked.

any other ideas appreciated

mike

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05-01-2004 02:59 AM  13 years agoPost 19
S_Owen

rrApprentice

Wichita Falls, TX.

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Is the motor smokin hot? Sometimes the fuel hitting the hot motor will vaporize and litterally push the fuel back out of the carb and up the fuel line and hold it there. It will take a high throttle to overcome it. Once the motor gets a good splash of cold fuel, it would be good to go. See it all the time in RC cars.

[b]Murphy's Constant:[/b] Matter will be damaged in direct proportion to its value.

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05-01-2004 04:05 AM  13 years agoPost 20
mikefoy6

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Thief River Falls, MN

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another good idea thanks S_Owen, but its not abnormaily hot. it does make sense though.

mike

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HelicopterMain Discussion › Why does my Heli keep hot starting???
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