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New DLE 55 always dies on taxi.

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Old 12-10-2011, 01:33 PM
  #1
P51p
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Default New DLE 55 always dies on taxi.

Hi All,
I have a new DLE 55 with about 3gallaons through it and using a 22X8 prop. The engine starts fine and has good transition to full throttle, with the lowest idle I can get is about 1900rpm (manual says 1350rpm but have never gotten it that low without it dying) but everytime its taxing out it dies. I have increased the idle to where it does not die during taxing but now the plane just runs away and is difficult to control during taxi. I have spent a lot of time adjusting the low idle mixture screw but does not really help. Not sure what to do.....

Not sure if this is related but I am using a standard futaba s3004 servo on the throttle, may be too much slop in the nylon gears during idle can cause iratic idle.....may be I should switch to a digital servo??? Not sure if that would help.



Any thoughts or suggestions would be great.

Thanks


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Old 12-10-2011, 02:23 PM
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Default RE: New DLE 55 always dies on taxi.

P51p,

Did it just start dieing on taxi or has it done it from the get go? If it just started and you have 3 gallons through the engine you might want to check your filter and the screen in the carb. If it's been doing it from the get go you need to tweak the needles.
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Old 12-10-2011, 04:15 PM
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Default RE: New DLE 55 always dies on taxi.


Quote:
ORIGINAL: Zippi

P51p,

Did it just start dieing on taxi or has it done it from the get go? If it just started and you have 3 gallons through the engine you might want to check your filter and the screen in the carb. If it's been doing it from the get go you need to tweak the needles.
Ditto that and definitely change that servo. You're going to have more than just idle problems when it lets go. It doesn't have to be a digital but metals gears are a must.

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Old 12-10-2011, 04:18 PM
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Default RE: New DLE 55 always dies on taxi.

Metal gears have more slop than nylon gears

The Hitec Carbonite gears do not seem to hold up at all on gas planes.
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Old 12-10-2011, 05:07 PM
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Default RE: New DLE 55 always dies on taxi.

It sounds like an air leak. Usually between the carb block/reed cage/engine case. Not lots of info to go on. Does it load up? Bog and die?
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Old 12-10-2011, 05:44 PM
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Default RE: New DLE 55 always dies on taxi.

Having a metal geared throttle servo is not necessary on a gasser, and any good quality analog or digital nylon geared servo will be satisfactory.

Karol
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Old 12-10-2011, 06:02 PM
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Default RE: New DLE 55 always dies on taxi.

Hi all,
Yes air leak check first or could be blocked progression holes they are tiny and easily blocked.That will effect idle to the lean side.I've had this on brand new carbs.Have to disassemble carb diaghram ,needle and all blow out gently with low pressure.
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Old 12-10-2011, 06:28 PM
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Default RE: New DLE 55 always dies on taxi.

What plug..... What gap?
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Old 12-11-2011, 02:50 PM
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Default RE: New DLE 55 always dies on taxi.

Hi All,
The engine has always done this right out of the box. I swapped the plug for the NGK CM-6, not sure of the gap. What should it be?
I have not taken the carb apart yet..I wanted to try the simplest things first.

w8ye.......I will definitely consider changing the servo to digital, but you are correct...metal gears sometime do have more slop than nylon.

Have any of you guys been able to get the idle as low at the manual says 1350rpm without it dying??

What prop's are you guys using and what idle rpm's are you getting with your DLE55?

Thanks.
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Old 12-11-2011, 03:51 PM
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Default RE: New DLE 55 always dies on taxi.

The Gap on the CM6 plug should be around .025" for best idle.

About 2200 with a 22 X 8 Zoar should be realistic for an idle and @7000 on top end.
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Old 12-11-2011, 04:00 PM
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Default RE: New DLE 55 always dies on taxi.

I am getting about 1900 with a 22 X 8 Zoar and about 6700 at full throttle. I guess it's not too bad....only if it didn't die on taxi.
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Old 12-11-2011, 05:11 PM
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Default RE: New DLE 55 always dies on taxi.

Are you flying from a hard surface or grass? As stated above I would gap to .024 or .025. I have several DLE55s and set my idle speed close to 2000 to 2100. If I fly from pavement mine will roll also. I won't put brakes of any kind on my planes, so they roll. But, they don't die in flight or while being taxied.

I have tried the low/high idle thing and don't like it either. I guess I'm blessed flying off grass at my home field.
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Old 12-11-2011, 05:22 PM
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Default RE: New DLE 55 always dies on taxi.

NM
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Old 12-11-2011, 06:13 PM
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Default RE: New DLE 55 always dies on taxi.

bgw45......i am flying from a paved runway....have been considering putting brakes on the wheels to slow it down during taxi.

I will definitely check the gap.

Once I am up in the air the engine is very reliable...she has never died on me yet.

But my feeling is that during taxi the rpm drops below 1900 and thats when it dies. When I start the engine and hold the plane it seems to be fine.
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Old 12-11-2011, 06:31 PM
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Default RE: New DLE 55 always dies on taxi.

maybe low end could be leaned out a bit.....youll know if its too lean when it hesitates or bogs when you gun the throttle
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Old 12-11-2011, 07:37 PM
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Default RE: New DLE 55 always dies on taxi.

One old trick is to stuff some foam up into the wheel pants above the tires, so that the foam is pushing down on the tires. This gives just enough friction if done properly, to prevent the model from "running away" on you during taxi on paved runways and taxi ways, but is really an insignificant drag when you go to full throttle for take off.

AV8TOR
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Old 12-11-2011, 07:46 PM
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Default RE: New DLE 55 always dies on taxi.

I have leaned it out and got good transition from idle to full throttle without any hesitation. But then it dies on the taxi way....
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Old 12-11-2011, 08:01 PM
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Default RE: New DLE 55 always dies on taxi.

One thing that gets your goat this time of year is the temperature.

Up in the air, and then when coming in for a landing the engine really cools down.
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Old 12-12-2011, 05:28 AM
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Default RE: New DLE 55 always dies on taxi.

P51p, MetallicaJunkie may have a good point. Try going lean enough on the low end to cause the engine to die in transition. Then go rich a little at a time till the engine does not hesitate on transition ( going either way ). That might help?...
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Old 12-12-2011, 08:05 AM
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Default RE: New DLE 55 always dies on taxi.

You may be idling at too low a speed in an effort to prevent it rolling on the hard surface, try increasing the idle RPM a bit and put some drag on the wheels and see if it keeps running.
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Old 12-12-2011, 03:21 PM
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Default RE: New DLE 55 always dies on taxi.

wrk.....Yea probably right, got the idle too low because it does want to roll away. Will try some silicone tubing on the wheel shaft to slow it down.
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Old 12-12-2011, 08:48 PM
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Default RE: New DLE 55 always dies on taxi.

I took the carburetor apart tonight besides for a little crap in the filter it looked pretty clean. The high and low speed needle channels looked clean but the three small holes in the barrel that appear to be connected to the low speed needle channel are difficult to tell wether they are clear or not. I think these small holes may be responsible for the idle gas/air mixture input to the engine, but not sure will have to do a little research on that.
I used compressed air to blow (gently) all the air and fuel channels.

Truly amazing how very simply that carburetor is, but very effective.
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Old 12-12-2011, 09:50 PM
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Default RE: New DLE 55 always dies on taxi.

You are correct
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Old 12-12-2011, 11:36 PM
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Default RE: New DLE 55 always dies on taxi.

My DLE 55 runs 23 x 8 @ 1800 - 7400rpm no problems.
First question, have you removed the idle stop screw that comes with all these generic purpose carbs (this screw is for weedwackers, blowers and the like)?
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Old 12-13-2011, 09:38 AM
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Default RE: New DLE 55 always dies on taxi.

kmeyers.....I did not replace the idle screw. What should I replace it with? And where do I get one?
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