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Home✈️Aircraft🚁HelicopterBeginners Corner › Help plz:: Where does exhaust/muffler tube go ???
09-14-2009 08:57 PM  11 years ago
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jaima

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Scotland. uk

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Help plz:: Where does exhaust/muffler tube go ???
Hi all,
Could someone please tell me which of the 2 tube connections on the fueltank connects to the exhaust/muffler ?
Thank you
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09-14-2009 09:01 PM  11 years ago
Anthony.L

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Seattle, WA

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Well without seeing the inside of the tank it's impossible to tell. However I can say this, the one that connects to the engine should have a clunk line and pickup attached to it inside the tank. The other one should have no clunk and basically is just a nipple venting the tank. The second in that scenario one attaches to the muffler to pressurize the tank.
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09-14-2009 09:03 PM  11 years ago
airdodger

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Johnston USA

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The exhaust pressure will go to the fitting with no fuel line connected. The one that goes to carb has a line connected in the tank with a weight on the end.Chris
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09-14-2009 09:37 PM  11 years ago
jaima

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Scotland. uk

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Thanks very much for the replies guys !!
The line with the clunk is on the other side of the tank, both the fittings in the pic have "no" internal tubes fitted to them, one tube connects to the muffler and the other tube is blocked off at the end of it with a "phillips screw" ??
I have found that the muffler will tend to get blocked with thick oily stuff (castor at a guess) depending on which way the tubes are connected to a certain nipple valve (A or B) and i have to take the muffler off and empty it before i can get the engine to run ?
also:
If an engine is running too fast at idle does it need leaned out (ie: too much fuel running through the carb) ??
Once again thank you
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09-16-2009 02:10 AM  11 years ago
dkshema

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Cedar Rapids, IA

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Too fast at idle is either you don't have the motor throttled down to idle, or you idle mixture is too lean. Perhaps a combination of both.

After you have run the motor for about 30 seconds, throttle down to idle, let the motor sit for about 30 seconds, idling. Then, pinch the fuel line as it goes into the carb. The motor should run on about 3 - 5 seconds before it speeds up and dies. If it takes much longer, the idle is too rich. If it dies much sooner, the idle is too lean.

If the motor spits, coughs, sputters, gurgles as you open it up from idle, then the idle is too rich.

If it hesitates and/or just flat out dies, the idle is probably too lean.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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09-16-2009 02:37 AM  11 years ago
GREYEAGLE

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Flat Land's

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Tank and Line's and Idle
One of the lines is definitley just a fill line, the other is a pressure tap comming off the pipe - bird must be equipped with a third line directley to the carb.

This bird is equipped with a tuned pipe " barely out of the picture " and not a muffler. TP's - can make the motor a bit peaky on it's carb setting's. Big difference in performance. A slightly high idle may be normal.

What type of bird is it ?? Look's a bit different on mechanic's ??
greyeagle
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09-16-2009 03:16 AM  11 years ago
dkshema

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Cedar Rapids, IA

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I'll take a stab and say it's a Robbe/Schluter Moskito with that side slung motor.

Tuned pipes were the rage in helis for a while, but as better mufflers evolved, you rarely see them used any more. As noted, tuned pipes can be finicky. The motor's great "when on the pipe", but outside of the pipe's power band, performance just plain sucks and the motor runs erratically.

That third spigot on your tank, if truly just an extra vent line, should be plugged with something more secure than a phillips screw. The screw with its threads can leak pressure, giving you uneven engine behavior.

I use a plastic plug made by Fourmost Products, they work and are cheap.

http://www3.towerhobbies.com/cgi-bi...p?&I=LXG848&P=7

If you're rebuilding that heli, getting it ready to fly after some years of neglect, you'd be wise to replace ALL of the fuel tubing, inside and outside the tank, give the motor a thorough inspection inside and out (cleaning as necessary, repairing or replacing as necessary), get rid of the tuned pipe in favor of a more user friendly exhaust system, and in general, make sure it's airworthy.

Same goes for the radio, if it's older and hasn't been used for awhile. Batteries are especially questionable in any used radio system.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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09-16-2009 02:35 PM  11 years ago
curbina36

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mcallen tx

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as every one says
engine to the clunk
muffler the one with no line
have to see the inside the tank
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Home✈️Aircraft🚁HelicopterBeginners Corner › Help plz:: Where does exhaust/muffler tube go ???
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