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HelicopterEngines Plugs Mufflers Fuel › MIxture problem driving me nuts. SOLVED!! HOORAH
06-01-2010 01:09 AM  7 years agoPost 21
fung_jeff

Key Veteran

Vancouver, BC, Canada

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Hmm I smell a huge problemo. I use to have the same... I brought it to my hobby store and they fixed it.

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06-01-2010 04:01 AM  7 years agoPost 22
David Blain

Key Veteran

Mt. Dora, Florida (USA)

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freakyreef-
koppter is dead on on this his reply!

Your sucking air somewhere!
It could be the O-Ring around the carb base, it could be a loose carb mount screw, loose head bolts are common on Hypers, the only other area is the back plate, Back Plate seal, or a poor engine to muffler seal that allows it to run lean!

Each one of these conditions above will cause you to run the engine "excessively" rich enough to make up for the air draft leak in another area on the engine...

I would suggest dropping the engine and take a solid look at all the "O" rings and seal points and ensure that all the bolts are tight and not sucking air from somewhere....

The only other probables are;
-Pressure loss on the seal on the tank(s)
-Pressure blockage from the exhaust line (pinched lines, clogged exhaust nipple bung, sharp 90 bends on the pressure feed lines)

The helicopter is "telling" you whats wrong, it's sucking air, now you just got to find out where buddy!

David Blain
T.O.R.C.H.S. Orlando Member

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06-01-2010 04:13 AM  7 years agoPost 23
jschenck

rrProfessor

La Vista, NE.

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another source for air leaks is the fuel filter. I've had several different brands and type of the screw together fuel filters and they can leak air by coming unscrewed a little or the gasket gets dried out.

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06-01-2010 09:16 PM  7 years agoPost 24
Bouchah

Key Veteran

Willow Spring, N. Carolina USA

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If using exhaust pressure,

Im not sure how the nipple for exhaust pressure attaches to the MP5 pipe but I was having trouble with a GP exhaust pipe and the nipple was the problem. The nipple was too long and when screwed in all the way it bottomed out on the inner tube of the pipe. I could blow air through the exhaust port with my finger over the tail pipe and a small amount of air would flow through the pressure nipple but not nearly enough to keep the tank pressurized. I removed the nipple, took off about 1/4", reinstalled, now there is way more air flow through it.

This may be your problem because when the tank is full it is easier to pressurize it, half empty the exhaust pressure may not be able to keep up.
Hope this helps, good luck.

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06-01-2010 09:30 PM  7 years agoPost 25
helitom

Senior Heliman

Pine Grove, Calif, USA

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I think after struggling this much, I would remove the engine to a test stand and strap a prop on it. Run it with a basic tank set up and see if it responds properly to throttle settings and to needle settings throughout the fuel load in the tank. That will at least isolate the problem to either the engine or the heli installation.

The older I get, the fewer things seem worth waiting in line for.

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06-02-2010 12:11 AM  7 years agoPost 26
Jeff polisena

Elite Veteran

westpalmbeachflorida usa

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What pipe ? try a different one ? Ive had pipes cause havoc with motors

I stole it ,flew it and gave it back ;)

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06-02-2010 12:53 AM  7 years agoPost 27
Thatlumox

Senior Heliman

NY

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I had a similar issue with a Hyper 50. It ended up being that the set screw that hold the rotor in the carb had worn. The excessive end play in the rotor was causing it draw air and run lean, most noticeably around mid range. Ended up changing the carb and problem solved. I checked everything before I though to check the carb mechanically.

"I'm a dirt torpedo!"

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06-02-2010 02:45 AM  7 years agoPost 28
leejax01

Veteran

Jax. Fl.

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Had a problem with a YS 50 and I didn't realize that when I installed the engine, I also installed a new Align filtered 3 way and it wasn't 100% tight. I found it by pumping out left over fuel and seeing air bubbles. Had to tighten that little bugger down really well to get it to stop.

Perfect practice makes perfect

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06-19-2010 11:30 PM  7 years agoPost 29
freakyreef

Key Veteran

Kansas\Colorado border

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Mixture problem driving me nuts solved!!

Well, Found the problem sort of. I had tried 3 different fuel filters and had checked them for leaks so I had dismissed it as the problem, I mean, what are the odds of 3 filters being a problem. However, I tried it today with no filter and it ran perfectly from start to finish.?? Not sure if I got a bad batch of filters or what. Going to order a few new ones and try with a different style. It wasn't leaking air, rather I could not get enough fuel to pass through them. Still baffled as to why at a full tank it was allowing more fuel to pass since the tank is actually lower than the carb and the header is in line with the carb.

Thank you all for your tips and hints. Thats what you gotta love about this hobby. Lot's of helpful people.

Walk on water long enough, eventually you will get your feet wet.

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06-22-2010 02:50 AM  7 years agoPost 30
Stall_Warning

Senior Heliman

NE, Pa. - USA

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If the header tank is above the main tank, and the header tank is
full, I believe this creates a reverse siphon. The fuel wants
to go back into the main tank.

I run the header tanks lower than normal wisdom. I'm still on the rich
side at the beginning, but the variation in flight seems less.

If you have a way to lower your header, see what you think.

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06-22-2010 02:55 AM  7 years agoPost 31
ssrobzoom

Key Veteran

Tn

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What type and brand was the fuel filter?

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06-22-2010 03:02 AM  7 years agoPost 32
freakyreef

Key Veteran

Kansas\Colorado border

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It was just an inline fuel filter without the tee. Not sure what brand though. I picked them up from Hobbytown. I do recall they were the el-cheapo filters. Serves me right.
Put 4 more flights on yesterday and am SO glad the problem is gone.

Walk on water long enough, eventually you will get your feet wet.

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HelicopterEngines Plugs Mufflers Fuel › MIxture problem driving me nuts. SOLVED!! HOORAH
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