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HelicopterEngines Plugs Mufflers Fuel › Oil dripping from exhaust - Is it normal?
12-28-2008 01:05 PM  8 years agoPost 1
Hyliman

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South Africa

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I have a OS 90 HZ with Hatori 18 running my Trex 700 on 15 % Nitro mix and have run almost 18 litres of fuel through it.My High speed needle is 1.5 turns open and mid 1 turn ,idle mixture slightly off centre on lean side.I have lots of power but i am concerned that in hover mode she drops 2 to 3 drops of oil per second from exhaust and when i go into idle up 1 there is no sign of oil except a medium smoke trail.
Is this normal or can anyone advise me on how to correct the problem?

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12-28-2008 01:34 PM  8 years agoPost 2
LONEWOLF2440

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MYRTLE BEACH S.C

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sounds to me you might be a little rich on mid

MIKADO LOGO 600 TREX 550

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12-28-2008 05:40 PM  8 years agoPost 3
Jlerch

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Parrish, Florida

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At low head speed, you may not make enough heat to vaporize the oil into smoke. When I'm in normal mode hover at 1450rpm mine drips occasionally too.

Keep in mind, 18 - 23% of your fuel tank is pure oil, and that oil has to come out somehow..

James Lerch - Tampa Bay FL

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12-28-2008 07:11 PM  8 years agoPost 4
Dr.Ben

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Richmond, VA, USA

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Normal.

Don't worry about it.

Ben Minor

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12-29-2008 12:34 AM  8 years agoPost 5
Inspector Fuzz

rrKey Veteran

NLA

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Yep, normal.
One of the reasons it occurs is that your muffler is a minny "still".
It is cooler, especially in winter, than the exhaust gas coming out of the port. The atomized oil in the fuel condenses on the walls of the muffler and pools in the bottom of it where it is blown out, bit by bit.

BTW, the oil in our fuel is never really burned. Maybe a little, but the cloud of smoke you see is finely atomized oil, like the mist from a perfume bottle sprayer. If the engine were running hot enough to turn the quanitiy of oil into smoke you are seeing it wouldn't be running for long.

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12-29-2008 05:38 AM  8 years agoPost 6
buburub

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Bayside, NY

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That is normal but I agree about the mid setting.
Recommended High Needle Valve Setting: 1 - 1.5 turns out
Recommended Mid Needle Valve Setting: 5-6 click open from fully closed.

Bub

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01-03-2009 06:51 PM  8 years agoPost 7
robhurlin

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Pretoria, South​Africa

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I had the same on my 90 - set the bottom end a bit leaner to get rid of the drips and ended up too lean. Seems to me a drip now and then is a sign that the bottom end is set right!

Rob.

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