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colin.scott.hudson(at)gma
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 Posted: Fri May 03, 2013 3:46 pm Post subject: Crankcase vent |
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| Quote: | I'm running a jabiru 2200, pusher configuration, engine exposed in a Kolb Mark 3x-tra. The engine doesn't burn any oil but I get a lot of blow by on each flight from the crankcase breather tube. I'm sure with the engine exposed the airflow over the vent is causing a vacuum and sucks it out. The vent reservoir doesn't trap the oil. Any one have a way to allow the crankcase to breath with out loosing a lot of oil? Sure get tired of cleaning oil off the tail feathers each time I fly
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Colin Hudson
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BARRY CHECK 6
Joined: 15 Mar 2011
Posts: 738
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| Posted: Fri May 03, 2013 5:41 pm Post subject: Crankcase vent |
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Colin:
I have a few tricks you can try - They are dependent on how your breather tube is configured and how the engine is mounted:
- Coming off the engine use a flexible rubber hose and put a "pigtail" in the run. A 360 Deg circle.
- Again with the flexible hose install a PCV (Positive Crankcase Ventilation) Valve as HIGH as possible in the tube above the height of the engine and make sure the check valve points down in the closed position.
- If you have say a 5/8" hose for the breather tube - Reduce it near the end tio half the size. You can use a step type fitting.
- Face the Breather Hose INTO the oncoming wind.
- And of course you can use any combination of this ideas.
Barry
On Fri, May 3, 2013 at 7:45 PM, Colin Hudson <colin.scott.hudson(at)gmail.com (colin.scott.hudson(at)gmail.com)> wrote:
[quote]--> JabiruEngine-List message posted by: Colin Hudson <colin.scott.hudson(at)gmail.com (colin.scott.hudson(at)gmail.com)>
> I'm running a jabiru 2200, pusher configuration, engine exposed in a Kolb Mark 3x-tra. The engine doesn't burn any oil but I get a lot of blow by on each flight from the crankcase breather tube. I'm sure with the engine exposed the airflow over the vent is causing a vacuum and sucks it out. The vent reservoir doesn't trap the oil. Any one have a way to allow the crankcase to breath with out loosing a lot of oil? Sure get tired of cleaning oil off the tail feathers each time I fly
Colin Hudson
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zeprep251(at)aol.com
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| Posted: Sun May 05, 2013 5:14 pm Post subject: Crankcase vent |
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C--
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pj.ladd(at)btinternet.com
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| Posted: Sat May 11, 2013 4:30 am Post subject: Crankcase vent |
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Sure get tired of cleaning oil off the tail feathers each time I fly
Hi,
I ran mine into a cut off plastic bottle mounted just behind the cabin
enclosure..
Pat
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BobHaas
Joined: 22 Mar 2013
Posts: 17
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| Posted: Sat May 11, 2013 7:48 am Post subject: Crankcase vent |
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The answer is a air-oil separator, with the vent piped back up to
the filler pipe. Spruce has small units for sale. "Old technology."
Bob Haas N330BH Lightning, N380BH, Alpi Pioneer.
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zeprep251(at)aol.com
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| Posted: Sat May 11, 2013 9:37 am Post subject: Crankcase vent |
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Bob,
Are you familiar with the Jabiru vent setup?It's a little different from most.
G.Aman
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BobHaas
Joined: 22 Mar 2013
Posts: 17
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| Posted: Sat May 11, 2013 1:17 pm Post subject: Crankcase vent |
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I believe so I fly a 3300 and a 2200. There is no oil film on the belly on either aircraft. I have the separator can plumed in to the oil drain
fitting on the sump. The crank case vent is in the normal filler tube on the top of the motor.
From: Gary Aman (zeprep251(at)aol.com)
Sent: Saturday, May 11, 2013 1:36 PM
To: jabiruengine-list(at)matronics.com (jabiruengine-list(at)matronics.com)
Subject: Re: Crankcase vent
Bob,
Are you familiar with the Jabiru vent setup?It's a little different from most.
G.Aman
-----Original Message-----
From: Bob Haas <checkpoint2(at)centurylink.net>
To: jabiruengine-list <jabiruengine-list(at)matronics.com>
Sent: Sat, May 11, 2013 11:48 am
Subject: Re: Crankcase vent
[quote]--> JabiruEngine-List message posted by: "Bob Haas" <checkpoint2(at)centurylink.net (checkpoint2(at)centurylink.net)> The answer is a air-oil separator, with the vent piped back up to the filler pipe. Spruce has small units for sale. "Old technology." Bob Haas N330BH Lightning, N380BH, Alpi Pioneer. --
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zeprep251(at)aol.com
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| Posted: Sun May 12, 2013 6:15 am Post subject: Crankcase vent |
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Bob,
Now I see what you have there.The line in your post that said (piped back up to the filler pipe) gave me the wrong impression.Your under the cowl installation is much neater.Mine requires no plumbing and is just as effective but it is not handsome hanging out in the breeze with the rest of the engine.
Thanks,G.Aman
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