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glipaz
Joined: 11 Jan 2011
Posts: 110
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 Posted: Sat Jul 11, 2015 8:36 pm Post subject: Housai vents/breathers |
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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? 
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wlannon(at)shaw.ca
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| Posted: Sun Jul 12, 2015 9:16 am Post subject: Housai vents/breathers |
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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
To: yak-list(at)matronics.com
Subject: 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
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wlannon(at)shaw.ca
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| Posted: Sun Jul 12, 2015 7:45 pm Post subject: Housai vents/breathers |
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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
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glipaz
Joined: 11 Jan 2011
Posts: 110
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| Posted: Sun Jul 12, 2015 8:50 pm Post subject: Re: Housai vents/breathers |
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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
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jblake207(at)comcast.net
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| Posted: Mon Jul 13, 2015 5:55 am Post subject: Housai vents/breathers |
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Cleanest engine compartment I've ever seen! Looks like a museum restoration that never flies... Beautiful! JB
From: "Walter Lannon" <wlannon(at)shaw.ca>
To: yak-list(at)matronics.com
Sent: Sunday, July 12, 2015 12:12:18 PM
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
To: yak-list(at)matronics.com
Subject: Housai vents/breathers
--> Yak-List message posted by: "glipaz" <glipaz(at)yahoo.com>
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
[quote][b]
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wlannon(at)shaw.ca
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| Posted: Mon Jul 13, 2015 8:43 am Post subject: Housai vents/breathers |
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Gil;
In the stock system the large, fwd. facing tube is the main case vent
outlet. Connecting the nose case vent to that means there is no longer a
vent unless you have provided another outlet. At minimum that would be a
connection to the oil tank allowing it's separate vent to handle the whole
system.
The separator is my own design. There are other good ones on the market
but location is very important (High & Hot) and the connections must be in
the right places.
Walt
--
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dougsappllc(at)gmail.com
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| Posted: Mon Jul 13, 2015 9:12 am Post subject: Housai vents/breathers |
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Walt,Not really the direct topic of this thread but:
Am I incorrect to assume that if you have the front and rear vents connected with a line which DOES NOT tee into the oil cooler (as it should), the only source of air to pressurize the case and expel oil would have to come from one of two sources, either cylinder valve or ring blow by or a leaking super charger seal. How else would it be possible to pressurize the case?
Doug
On Mon, Jul 13, 2015 at 9:40 AM, Walter Lannon <wlannon(at)shaw.ca (wlannon(at)shaw.ca)> wrote:
[quote]--> Yak-List message posted by: "Walter Lannon" <wlannon(at)shaw.ca (wlannon(at)shaw.ca)>
Gil;
In the stock system the large, fwd. facing tube is the main case vent outlet. Connecting the nose case vent to that means there is no longer a vent unless you have provided another outlet. At minimum that would be a connection to the oil tank allowing it's separate vent to handle the whole system.
The separator is my own design. There are other good ones on the market but location is very important (High & Hot) and the connections must be in the right places.
Walt
--
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