106 almost cuts out in knife edge??

[baxternick]

Ok I have a 106 that is mounted on the front of a AM 35% yak. I am running the 90 degree intake, and the intake in no way hangs out of the bottom of the cowl. Heres my deal. When I am doing inverted harriers, or slow knife edges my motor bogs down so much it almost cuts off! In any other manuever such as hovering, waterfalls, uplines, or elevators it runs like a top! Gerhart told me it was a air issue over the intake because it was hanging out of the cowl. I have since built a baffle much like a hood bubble on a Mittsubishi Eclipse for it. Still does it though. Could this just be a needle setting or do I need to baffle my cowl to change the direction of the air flow? I would hate to go through that much trouble because my engine is running cool and smooth already!

[Jcarte]

Purchase the diaphram cover that has a fuel tube nipple installed on it and run the fuel line into the fuse. Gerhart sells them.

[DKnippen]

	Quote: Originally Posted by Jcarte
	Purchase the diaphram cover that has a fuel tube nipple installed on it and run the fuel line into the fuse. Gerhart sells them.

I agree with this solution too. The diaphram is subject to all kinds of turbulence and some carbs need a better environment to operate in. (I used to have the same problem with knife edge.
Dan

[baxternick]

I have the fuel tube going from the diaphram to the intake manifold that is designed for the engine. So can I take a large hose from the intake back into the fuse to calm it down? Or is there another better solution?

[zivbit]

Hi,

Known bug.
you are too rich on the low needle. for sure.
start leaning it out litlle bit at the time until you feel improvement.

We had this issue on few models, and when leaned out the low needle - all problems were gone.

Jan - feel free to bug in, you know this issue well.

Ziv

[baxternick]

Thats what I thought might be the problem. The engine ran so perfect otherwise though so I was scared to turn that low end in anymore. I will slowly work it in until the problem goes away then! Thanks...

[wifpwcf]

	Quote: Originally Posted by zivbit
	Hi, Known bug. you are too rich on the low needle. for sure. start leaning it out litlle bit at the time until you feel improvement. We had this issue on few models, and when leaned out the low needle - all problems were gone. Jan - feel free to bug in, you know this issue well. Ziv

yeh ziv is right i had that problem & rang our agent in oz & he said to lean the bottom & bingo only dose it on the first few rolls on my first flight from fuel siting in the trumpet from chokeing it then its fine all day.if not run a long tygon tube into the fuse & thet will stop it
dont be scared to lean the bottom end of it wont hurt it the top end to lean means ouch,,lean the low of till it nearly stops runnig then go back a little & bingo
hope this helps
cg

[adrian]

yup - Zivo is spot on - the low is rich and you need to lean it out slowly until it goes - this came directly from QQ when he was still 3w - on all the 3w's the first thing we do is to slow roll inverted and if the rpm drops we know the low is to rich - thats it

[Flyinrazrback]

I found the sweet spot on all my 3W’s on the low end was this: When you start it up for the first time of the day (or after sitting a while after running), the engine will stumble and die if when you try to transition it right after started, but after about 30 seconds of warming up it transitions just fine (that is the ideal setting for the low end). But, if it will take a transition right after starting while the motor is cold, you are too rich. Also, 99% of the time I end up removing the 90 degree intake and just running the line back into the fuse, suggest you give that a try as well.

[Jcarte]

The sweetest spot for my 3W was in someone elses airplane, sold it for just that reason.

[jongurley]

HAAHAHHAA< that is what I was thinking Jeff,,, I currently have a new BME110x but my next purchase will of course be a DA100,,,, ,

[Flyinrazrback]

Hopefully a Moderator will delete posts #10 and #11 as they arent helping this guy in any way to tune his motor.