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HelicopterMain Discussion › hit hold - engine runs on - too rich?
09-03-2003 09:46 AM  14 years agoPost 1
Reesy

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In the doghouse ... Nottingham UK

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Hi chaps
Just a question here .. I'm running in my 50 and decided it was time to try leaning a tad.

Tried leaning the bottom (which controls most of the mid range) and now it runs on if I hit hold...

Trouble is it has all the characteristics of an over rich engine .. poor throttling and if I put my finger on the back plate I have to press quite hard for several seconds before it becomes uncomfortably hot.

So can an overly rich engine run on (too much fuel) or am I misinterpreting what I'm seeing?

Paul

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09-03-2003 10:20 AM  14 years agoPost 2
RotarSoft

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St Leonards On Sea UK

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Reesy,

If its hanging when you go to idle chances are the bottom end is too lean. The more fuel getting through at idle the slower the engine will run.

Do this to set your engine.. Start the motor and let it settle into a steady idle, then pinch the fuel line. If the motor dies pretty well straight away its too lean, if it takes about 10 seconds or more to die then it its too rich. You want to aim for about 3 seconds before the engine starts to die. Once this is set you can tune the main needle for hovering and flying around.

Hope this helps

Cheers

Mark

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09-03-2003 11:01 AM  14 years agoPost 3
mvhf

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Antwerp, Belgium

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Reesy, what do you mean by
and now it runs on if I hit hold...
Throttle hold is suppose to mean to keep running but at a certain point, most of the time idle is chosen, but never to stop running, or am I missing something.

Fot tuning kee Mark's advice

regards

MArc

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09-03-2003 11:02 AM  14 years agoPost 4
Reesy

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In the doghouse ... Nottingham UK

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Thanks Mark
That was pretty much how I've allways set it ..

Just wondered if my hypothesis was possible .. bit dumb I guess

Paul

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09-03-2003 11:07 AM  14 years agoPost 5
Reesy

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In the doghouse ... Nottingham UK

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Hello MVHF
thanks for taking the trouble to reply, with a well set engine if you hit hold it should drop instantly to idle,

"running on" or were it takes a second or 3 to drop to idle is normally symptomatic of a too lean (possibly overheating) engine.
I just wondered if the same situaton could arise if it was too rich and sort of flooding a bit with unburnt fuel

Paul

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09-03-2003 11:10 AM  14 years agoPost 6
mvhf

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Antwerp, Belgium

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Sorry Reesy,

just if my english was better :-)

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09-03-2003 11:34 AM  14 years agoPost 7
RotarSoft

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St Leonards On Sea UK

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Reesy,

Which engine is it your are having problems with and what pipe/fuel/plug combination are you running. Tuned pipes have a habit of hanging on the pipe.

Cheers

Mark

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09-03-2003 12:03 PM  14 years agoPost 8
Reesy

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In the doghouse ... Nottingham UK

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Hi Mark
Wouldn't really describe it as a problem, Alan Greenfield has installed a new piston and liner in my West 50H ..summat to do with experimenting with exhaust port timing ..WAAAY.. too technical for me

Once I've got it run in a bit (currently using prosynth 10%) he's given me some of their competition fuel to try .. 15% nitro and 7.5% oil .. ooh er missus... evidently some Austrian chappie ran it and got awesome performance with a substantial temp drop..

knowing me I'll just knacker it ...

It was just something I observed .. as I leaned the low needle the tiniest amount the running on suddenly emerged but the engine was still pretty much stone cold by my usual standards (OS 50 and 91)

Off to fry some eggs on my TT39

Paul

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09-03-2003 12:34 PM  14 years agoPost 9
RotarSoft

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St Leonards On Sea UK

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Reesy,

Tuned pipes have a habit of causing this problem at idle. Especially the highly tuned onces, which I guess is what comes as standard with the West 50 if I remeber correctly.

To get round it richen the bottom end and try running the hottest plug you can get your hand on.

It could also be a characteristic of the engine with the new piston/liner and timing.

Cheers

Mark

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