106 almost cuts out in knife edge??

[cloudshaker]

	Quote: Originally Posted by Jcarte
	The sweetest spot for my 3W was in someone elses airplane, sold it for just that reason.

I would never sell my engine because I couldn't set the carb, besides this thread is about someone asking for help not why you sold your engine or what your next engine will be.
Baxternick, I had the same prob and I followed razr's advice and removed the velocity stack and ran a fuel line from the vent to the fuselage then the problem went away. Good luck

[adrian]

I still have to find a really bad engine and I still have to tune 46fx's for many people weekly - lol - should tell you something??

ditto dudes - lets help the bro rather than talk..........!!!!

[baxternick]

Thanks for all the help guys. I will lean it out to see what happens. Now as for the smart remarks..... My rich 3w that has never cut off or given me any other problems outpulls the da's at our field on the same am yak with the same prop like its nobodys business, and the other guys have no problem admitting that my motor does this. I find it sad someone would sell such a strong motor just becasue they lack the patience to turn a needle a few times becaues the end reward is so nice!

That was not the title of the thread though so thank you everyone for helping me out.

[adrian]

bax - welcome!!! enjoy your power house!!

[Borries]

	Quote: Originally Posted by Jcarte
	The sweetest spot for my 3W was in someone elses airplane, sold it for just that reason.

The same here ! tried all of the above and it was still a problem !!!

[Flyinrazrback]

	Quote: Originally Posted by Borries
	The same here ! tried all of the above and it was still a problem !!!

Did you ever get any 3W knowledgeable folks to help you out?

[3dubya]

Bllahahah farq me, sold my powerful 3W engine cause it was too rich on idle, my favorite joke of the day. 3W test run and sell the engine on run in settings which do make them load up rich half throttle inverted and on knife edge (think knife loading is cause RPM is bogged down half throttle due to huge drag and the jets are spraying in to much fuel for scenario), its not a car you don't turn the key go. The 3W motors especially the CS are very powerful cause they are tight new and need to bed in they say up to 20hrs in manual. Yes alternates are easier for the user first up cause the probably could run on factory needles forever. Not lean for them is probably very lean for a bedding in 3W just different tolerances. Performance motors usually don't come performance ready. I'm no expert, just still learning but common sense rules here..

If 3W come out with a electronic fuel injection system that runs off exhaust gas temps or unused oxygen levels the world will change. They will be a turn key and go system then. They could map the system to run at a lower temp richer mixture for 20 hours then they lean themselves out, or stay rich for poorer cooling setups in planes. How good are the turbine systems these days like that. I got news they are working on it now, germans never sleep when it comes to these things.

[Borries]

	Quote: Originally Posted by Flyinrazrback
	Did you ever get any 3W knowledgeable folks to help you out?

Yes ! as well as every man and his dog !! Don,t get me wrong I am not saying it is a bad motor (3W 106 QS) it had heaps of power, after trying all the tricks still could not get rid of the problem !

[3dubya]

	Quote: Originally Posted by Flyinrazorback
	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.

Yer I think your right Flyinrazorback, i notice same thing, my final settings after run in the engine needs to fill the carby reservoir 20sec running before you can throttle up. If i go to full slowly warm it right up, then idle, then slam it open it wont die on pick up with big gulp of air. When I pinch fuel line on idle it revs up a fair bit as well, but takes a while.
Ive been tuning full throttle with engine going lately (very dangerous I know, scarey **** with 32" blade) i fine peak very quickly and gingerly then richen up top so i hear it drop a audible amount approx 200 revs. I got sick of turning motor off having it cool make adjustment, start then loose where i am. unfortunately pinching fuel line on full don't work well for it don't ping the revs like a little glow engine, must be carby reservoir.

[Flyinrazrback]

Cool deal, I typically tune the high end by ear and double check the temps.

[3dubya]

where and what were the temps you are looking for on the 157CS you had. I'm half tempted to hook a servo up to the top needle on my next plane with 1/8 max swing, we get 15°C days then 40°C the next friggin top end can be too lean when cooling gets to hot. Tune it on the hot day and have it rich on the cold I reckon if it don't bug ya. Some say motors get rich on hot days, but I ant seeing that, the motors vaporise the fuel when they heat up to much maybe making them leaner. Baffling is a must too on a friggin hot day, the dry drought temps we get here in Aus are extreme..

[Flyinrazrback]

Around 220-250 with the painted heads, depending on the plane (cowling size) and what kind of baffling it has.