Today's Message Index:
----------------------
1. 05:21 AM - Re: oil sucked out of my 912 (John Bickham)
2. 06:48 AM - Re: oil sucked out of my 912 (Thom Riddle)
3. 07:12 AM - Re: Re: oil sucked out of my 912 (Vic)
4. 07:29 AM - Re: Re: oil sucked out of my 912 (John Hauck)
5. 07:44 AM - Re: oil sucked out of my 912 (jerb)
6. 07:48 AM - Re: oil sucked out of my 912 (Robert Laird)
7. 04:10 PM - Re: Re: oil sucked out of my 912 (Ellery Batchelder Jr)
8. 05:59 PM - Re: oil sucked out of my 912 (Thom Riddle)
Message 1
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| Subject: | Re: oil sucked out of my 912 |
Just wanted to add this one for consideration....
John H pointed this out to me on our trip out west in May. Play with the location
and direction of your vent hose. Originally, the last foot of mine was horizontal
and terminated within about 6" of the prop. We went through some rough
stuff on the trip to MV on then to SE Oregon. I had some pretty good oil/dust
residue on my tail section.
With John H's recommendation, I turned the last 6" down and further away from my
prop. Since then things have been better. Haven't flown in that much bumpy
air since then. But prop and far aft of engine staying a bit cleaner than is
same conditions prior.
Easy and cheap experiment if you wanted to check.
--------
Thanks too much,
John Bickham
Mark III-C w/ 912UL
St. Francisville, LA
I know many pilots and a few true aviators. There is a distinct difference that
I have the greatest respect for.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=276554#276554
Message 2
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| Subject: | Re: oil sucked out of my 912 |
My Jabiru has a rather small home-made air/oil separator with a drain cock at the
bottom with a hose that extends below the bottom of the fabric in the back.
I empty that after every flight or two, usually just a few drops but what comes
out of there I would not want to route back to my engine, thought some Jabiru
operators do. That stuff is nasty. The air/oil separator also has a hose connected
to the air outlet that goes overboard too to make sure there is no back
pressure and the crankcase can still breath normally if the separator fills
up.
Once I started emptying the separator regularly and keep the oil level at the currently
recommended relatively low level (Jabiru changed their recomendation
too) I get zero oil streak on the Slingshot tail.
--------
Thom Riddle
Buffalo, NY
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x31
Consistency requires you to be as ignorant today as you were a year ago.
- Bernard Berenson
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=276561#276561
Message 3
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| Subject: | Re: oil sucked out of my 912 |
All or none,
I simply put a loop up from the oil tank. Oil drains back water vapor and
whatever else
blows out directly at prop no mess.
I've seen drawings of other craft that cut a slot in the overflow tubing
inside the cowling
and extend the tube outside. Any excess vacuum only pulls cowling air.
Vic
Xtra 912
Message 4
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| Subject: | Re: oil sucked out of my 912 |
> I simply put a loop up from the oil tank. Oil drains back water vapor and
> whatever else
> blows out directly at prop no mess.
>
> I've seen drawings of other craft that cut a slot in the overflow tubing
> inside the cowling
> and extend the tube outside. Any excess vacuum only pulls cowling air.
>
> Vic
Vic/Gang:
There is a steady stream of 3 to 5 psi air (blowby) exiting the vent tube.
I would think, in a down draft, serious negative G situation, when the oil
hits the lid of the oil tank, it will be going out the vent, loop or not.
Personally, I want the waste material that is a byproduct of gasoline engine
to be dumped overboard.
This is the way I operate my 912ULS. May not be recommended or approved by
Rotax.
The 912ULS uses crankcase pressure to push oil out of the crankcase back to
the oil tank. As long as the engine is running, there is 3 to 5 psi
pressure in the vent line.
john h
mkIII - When it gets warm enough to fly, it will be raining. ;-(
Message 5
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| Subject: | Re: oil sucked out of my 912 |
Hi Ralph,
Man you testing this old guys memory. Look at the crank case vent
tube on some small certified aircraft like a 150 or 152 Cessna. Its
a little fuzzy but on our 115 HP Lycoming powered 1973 Citabria I
believe the end of crank case vent tube was cut at an slight
angle. Can't recall if the angle faced forward or rearward. It also
had a hole of about 3/16" drilled in either the front or rear side of
the tube about an inch or so above the end. According to our A&I
this hole was there for a purpose if the normal exit should become
plugged. I would also think the hole may reduce any siphon effect.
jerb
At 08:33 AM 12/4/2009, you wrote:
>
>Guys,
>
>My 912 is low on oil occasionally and it's not because the engine is
>burning it. It's being sucked out of the vent tube. This tube runs
>down alongside the bottom of the engine and exits in front of the
>prop. I find evidence of oil on the prop if I fill the oil to the
>marks on the dipstick.
>
>Is there a better way of venting the oil canister?
>
>The tube is flat on the bottom and Mark German (builder) thinks the
>venturi effect is sucking out the oil. He told me to file the vent
>tube at about a 45 deg angle so it would have an opening towards the
>front. Then it will have a positive pressure instead of a negative one.
>
>What kind of oil canister venting do some of you guys have on your 912's?
>
>Ralph B
>
>--------
>Ralph B
>Original Firestar 447
>N91493 E-AB
>970 hours
>23 years flying it
>Kolbra 912UL
>N20386
>1 year flying it
>110 hrs
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=276174#276174
>
>
Message 6
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| Subject: | Re: oil sucked out of my 912 |
(How can I NOT jump in... this is getting almost as good as SeaFoam! ;-)
The angle cut and backup holes are nice touches... however..... if you get
a kink in the tube somewhere between any backup holes and the vent at the
top of the tank, then the 912ULS will have trouble circulating the oil
through the engine. Ask me how I know! :-p
-- Robert
On Mon, Dec 7, 2009 at 9:42 AM, jerb <ulflyer@verizon.net> wrote:
>
> Hi Ralph,
> Man you testing this old guys memory. Look at the crank case vent tube on
> some small certified aircraft like a 150 or 152 Cessna. Its a little fuzzy
> but on our 115 HP Lycoming powered 1973 Citabria I believe the end of crank
> case vent tube was cut at an slight angle. Can't recall if the angle faced
> forward or rearward. It also had a hole of about 3/16" drilled in either
> the front or rear side of the tube about an inch or so above the end.
> According to our A&I this hole was there for a purpose if the normal exit
> should become plugged. I would also think the hole may reduce any siphon
> effect.
> jerb
>
>
> At 08:33 AM 12/4/2009, you wrote:
>
>>
>> Guys,
>>
>> My 912 is low on oil occasionally and it's not because the engine is
>> burning it. It's being sucked out of the vent tube. This tube runs down
>> alongside the bottom of the engine and exits in front of the prop. I find
>> evidence of oil on the prop if I fill the oil to the marks on the dipstick.
>>
>> Is there a better way of venting the oil canister?
>>
>> The tube is flat on the bottom and Mark German (builder) thinks the
>> venturi effect is sucking out the oil. He told me to file the vent tube at
>> about a 45 deg angle so it would have an opening towards the front. Then it
>> will have a positive pressure instead of a negative one.
>>
>> What kind of oil canister venting do some of you guys have on your 912's?
>>
>> Ralph B
>>
>> --------
>> Ralph B
>> Original Firestar 447
>> N91493 E-AB
>> 970 hours
>> 23 years flying it
>> Kolbra 912UL
>> N20386
>> 1 year flying it
>> 110 hrs
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=276174#276174
>>
>>
>>
>>
>>
>>
>>
>>
>
>
Message 7
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| Subject: | Re: oil sucked out of my 912 |
Thom Riddle
have you got a print of how that is made ? I know a friend that needs one
Ellery in Maine
Making skis for the Mk3C
-----Original Message-----
From: Thom Riddle <riddletr@gmail.com>
Sent: Mon, Dec 7, 2009 9:46 am
Subject: Kolb-List: Re: oil sucked out of my 912
My Jabiru has a rather small home-made air/oil separator with a drain cock
at
he bottom with a hose that extends below the bottom of the fabric in the
back.
empty that after every flight or two, usually just a few drops but what
comes
ut of there I would not want to route back to my engine, thought some Jabi
ru
perators do. That stuff is nasty. The air/oil separator also has a hose
onnected to the air outlet that goes overboard too to make sure there is
no
ack pressure and the crankcase can still breath normally if the separator
fills
p.
Once I started emptying the separator regularly and keep the oil level at
the
urrently recommended relatively low level (Jabiru changed their recomendat
ion
oo) I get zero oil streak on the Slingshot tail.
--------
hom Riddle
uffalo, NY
olb Slingshot SS-021
abiru 2200A #1574
ennessee Prop 64x31
Consistency requires you to be as ignorant today as you were a year ago.
- Bernard Berenson
ead this topic online here:
http://forums.matronics.com/viewtopic.php?p=276561#276561
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Message 8
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| Subject: | Re: oil sucked out of my 912 |
Ellery,
I didn't build the airplane but it is a simple device. The breather hose goes into
the top. A fitting in the bottom has a shut-off valve with a hose to the bottom
of the airplane so you can drain it at your convenience. Near the top but
coming out the side is another fitting with a hose attached going overboard
also. This last one allows the breather to work and the container just catches
the oil and condensation at the bottom. Actually both in inlet and outlet (not
the drain) fittings can be in the top or near the top if that is easier to configure.
The container can be made of anything that will stand high oil temperature. To
work effectively the container should be more tall than squat but of any volume
from a 4-6 oz or so as a minimum. The smaller it is the more often you'll have
to drain it. Go to any of the aircraft suppliers and look at their air/oll
separators. Mine has the bottom fitting with shut-off valve that most do not.
The valve allowing me to decide when to dump it into a waste container instead
of dripping all over the airplane.
I hope this description helps.
--------
Thom Riddle
Buffalo, NY
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x31
Consistency requires you to be as ignorant today as you were a year ago.
- Bernard Berenson
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=276655#276655
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