|
|
Canada
Joined Jan 2006
78 Posts
|
3W 60 running inverted (Out of ideas)
3W 60 running inverted (Out of ideas)
I have a 3W 60 long that I have had since 93 with a side induction card. Its has had very little running since I brought it all those years ago. I am having problems with flying my new Yak 54 inverted. As soon as I roll I lose my power. I have tried a number of ideas to fix the problem without success. 1) Fitted a carb plate over the diaphragm vent. 2) tapped a nipple and vent line from the diaphragm to the radio bay. 3) fitted a velocity stack within cowl. 4) Added air intake ducted from face of cowl to carb (tried with and with out velocity stack). 5) (Fuel tank sits about 4 in higher then the carb) So I tried a hopper tank right behind the carb. 6) Enlarged air exit holes for air within the cowl to exit 7) tried both 40-1 lawboy and 80-1 AMS oil mixes. I am now simply about of ideas. Can anyone help? |
|
|
|
|
Re: 3W 60 running inverted (Out of ideas)
Lean the low end needle out. This happens at a reduced power setting, half throttle???
|
|
|
Canada
Joined Jan 2006
78 Posts
|
Re: 3W 60 running inverted (Out of ideas)
I can hear the power change at full power but I notice it more at the mid range.
|
|
|
|
Re: 3W 60 running inverted (Out of ideas)
Lean the low end some. Go 1/8 turn at a time. You want the engine to just barely sag in a rapid transition.
It will kinda sound like a BUUUUUUUUUUUUUUUUUUHHHHHHHHHHHHHHHHHHHH. If you go too far, just open it 1/8 turn and should be happy. Or fly it and tweek the needles that way. That is usually how I do it. Fly, and do a series of half rolls. If the engine burbles in the mid, then I know I can lean it more. You are looking for a constant RPM thru the midrange. The low needle operates the carb up to about 67% opening. Then after that, the high needle takes over. I think once you get mid range set, the high needle might be ok......... |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |
Similar Threads | |||||
Category | Thread | Thread Starter | Forum | Replies | Last Post |
need help with a 3W 60 engine | P40 | Australia | 3 | 01-29-2007 06:54 AM | |
2007 IMAC sequences (written descriptions) | Wayne | General IMAC Discussions | 60 | 01-17-2007 09:25 PM | |
Airframe for old 3W 60 (long) | rc technics | Airframes and Kits | 1 | 12-30-2006 06:06 PM | |
3W 100 leaning when inverted | Breakstuff5050 | Gas Engines | 41 | 09-24-2006 06:47 PM |