Today's Message Index:
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1. 10:16 AM - Re: Housai vents/breathers (Walter Lannon)
2. 10:55 AM - Re: Housai vents/breathers (glipaz)
3. 08:45 PM - Re: Re: Housai vents/breathers (Walter Lannon)
4. 09:53 PM - Re: Housai vents/breathers (glipaz)
Message 1
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| Subject: | Re: Housai vents/breathers |
Where is the oil getting out?
Forgetting the air/oil separator for the moment if you connect the front
case to main case vent line there is no vent outlet unless the oil tank vent
has been modified to connect with the main.
Where is the separator mounted and what is the size. If not HIGH and BIG
it probably wont do the job
The M14 as mounted in the Yk 52,etc. has all the aerobatic goodies,
effective separator, vent change-over valve, etc.
Some CJ photos attached.
m: glipaz
Sent: Saturday, July 11, 2015 9:36 PM
Subject: Yak-List: Housai vents/breathers
On the Housai, if I connect the nose case breather to the crank case
breather (and connect them to an air-oil separator), it causes lots of oil
to come out of the crank breather. Removing the connection between the
nose and crank breathers relieves the problem. On M-14's, connecting these
breathers is common practice. Any thoughts on why this is the case in the
Housai? :?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=444668#444668
Message 2
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| Subject: | Re: Housai vents/breathers |
I think all would agree that in normal operation, the case breather can dirty the
engine by producing an oily mist while the nose breather only really produces
oil in negative g maneuvers. What we discovered is that if you put anything
on the nose breather to catch oil (even a sock), the case breather will spew
oil all over the motor, not just mist, but real get out the rags and mineral
spirits oil. That tells me that the case on the Housai breathes through the
nose as well as through the case breather. It must need lots of air. Some
people put a K&N filter on the nose vent. I can't because any resistance causes
the case vent to spew oil. The case vent has a Y fitting so I connected
the nose and the case with a large hose and connected the rear outlet of the Y
to the separator. Therefore, both vents would breath through the separator.
The separator air vent was vented out the bottom of the firewall. Unlike
yours, the separator oil line had a long hose with a plug for draining after flight
rather than being connected back to the oil tank or motor. I did not expect
much oil. But, the separator threw lots of oil out of the air vent all down
the belly and the oil hose was also full of oil. Only when I removed the
large hose connecting the nose vent did it stop doing that. The same separator
works great on a friend's M-14p with the same connections.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=444676#444676
Message 3
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| Subject: | Re: Housai vents/breathers |
You did not mention how the oil tank vent works with your system. The
stock vent pipe is internal and, of course, vents the top of the tank.
However any negative "G" will fill that pipeline which then dumps overboard
with positive "G".
As you see in the photos I have de-activated the original and vented the
tank directly to the separator. Negative "G" will transfer some oil from
the tank. The nose case and main case vents are joined with a 1" hose and
the main vent pipe is modified with a 3/4" nipple attached by welding. A
3/4" hose attaches that to the separator and a 1/2" hose returns drain oil
to the crankcase. The separator vent outlet is via a 1" SCAT type hose
exiting at the lower left firewall.
I have yet to see even the slightest trace of oil exiting the vent (it is
always bone dry) or any trace of oil on the belly.
The system works so well that one is tempted to negative "G". But this is
simply an air/oil separator, not an inverted oil system. Without an
inverted oil supply to the pump oil pressure is lost in seconds with ANY
negative loading. Extreme caution is advised.
Walt
-----Original Message-----
From: glipaz
Sent: Sunday, July 12, 2015 10:52 AM
Subject: Yak-List: Re: Housai vents/breathers
I think all would agree that in normal operation, the case breather can
dirty the engine by producing an oily mist while the nose breather only
really produces oil in negative g maneuvers. What we discovered is that if
you put anything on the nose breather to catch oil (even a sock), the case
breather will spew oil all over the motor, not just mist, but real get out
the rags and mineral spirits oil. That tells me that the case on the Housai
breathes through the nose as well as through the case breather. It must
need lots of air. Some people put a K&N filter on the nose vent. I can't
because any resistance causes the case vent to spew oil. The case vent has
a Y fitting so I connected the nose and the case with a large hose and
connected the rear outlet of the Y to the separator. Therefore, both vents
would breath through the separator. The separator air vent was vented out
the bottom of the firewall. Unlike yours, the separator oil line had a
long hose with a!
plug for draining after flight rather than being connected back to the oil
tank or motor. I did not expect much oil. But, the separator threw lots of
oil out of the air vent all down the belly and the oil hose was also full of
oil. Only when I removed the large hose connecting the nose vent did it
stop doing that. The same separator works great on a friend's M-14p with
the same connections.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=444676#444676
Message 4
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| Subject: | Re: Housai vents/breathers |
Thank you Walt. This looks like a well-designed system. What brand/model is the
separator? Back to my original question, i am still wondering why closing
the nose vent or connecting it to the case vent causes the case to be over-pressurized
and start venting oil.
Gil
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=444687#444687
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