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Date: Wed, 2 Dec 2009 01:00:50 -0500
Message-ID: <1ab24f410912012200x528510ebh217b97d6e24db108@mail.gmail.com>
Subject: Oil filler cap
From: Lynn Hanover <lehanover@gmail.com>
To: flyrotary@lancaironline.net
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The engine block needs to be vented to the air from a point as high above
the oil level in the pan as is possible. The cap seals tightly but the
filler tube has a small pipe sticking out the side to provide that vent. The
stock little tube works fine in a street engine and all or part of this
breather is run back into the intake for pollution (legal) reasons.

In racing we use at least a dash 10 hose size for that venting operation. It
is the path for gasses escaping past the combustion seals in hard use (like
racing or airplanes). Not venting will pressurize the crank case and defeat
the front or rear main seals, and make a huge oil leak.

On shutdown, local air is pulled into the engine as it cools to ambient.
That air will have humidity in it. At night the water condenses out of the
air and a few drops of water will run down into the oil supply. As the
engine is used again the oil temps get to 160 or more and most of the water
is forced out of suspension and you will see a bit of water drip from
the crank case breather hose, or find some in the catch tank if you have
one. This output may be a sickly white and frightens many into thinking
something is wrong, but this is normal for all engines and not peculiar to a
rotary.

Lynn E. Hanover

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<div>The engine block needs to be vented to the air from a point as high ab=
ove the oil level in the pan as is possible. The cap seals tightly but the =
filler tube has a small pipe sticking out the side to provide that vent. Th=
e stock little tube works fine in a street engine and all or part of this b=
reather is run back into the intake for pollution (legal) reasons. </div>

<div>=A0</div>
<div>In racing we use at least a dash 10 hose size for that venting operati=
on. It is the path for gasses escaping past the combustion seals in hard us=
e (like racing or airplanes). Not venting will pressurize the crank case an=
d defeat the front or rear main seals, and make a huge oil leak.</div>

<div>=A0</div>
<div>On shutdown, local air is pulled into the engine as it cools to ambien=
t. That air will have humidity in it. At night the water condenses out of t=
he air and a few drops of water will run down into the oil supply. As the e=
ngine is used again the oil temps get to 160 or more and most of the water =
is forced out of suspension and you will see a bit of water drip from the=
=A0crank case=A0breather hose, or find some in the catch tank if you have o=
ne.=A0This output may be a sickly white and frightens many into thinking so=
mething is wrong, but this is normal for all engines and not peculiar to a =
rotary. </div>

<div>=A0</div>
<div>Lynn E. Hanover</div>

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