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sandbag23(at)msn.com
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 Posted: Sat Feb 18, 2012 6:09 pm Post subject: Oil consumption has increased...maybe |
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I've been losing more oil than usual so am now both tracking consumption more closely and looking for ways to decrease it.
Research had dissuaded me from considering air-oil separators. I'm going to do the trick of rerouting the breather hose in a higher arc under Gary's cowl. I'm wondering if there's a venturi effect going on too. The 'whistle' slot is way up inside. My question is how far should the tube extend from the Jaguar cowl? Same 1inch +/- 1/2inch? Gary is probably the only one who knows the pressures and flows enough to say.
So what happened? Maybe just normal engine wear on a mid-time engine, or maybe I'm running it harder because I can with the new cowl. By the way, I'm consistently seeing roughly 5-10 KTAS better than book with about .5 gph less than book for the given rpm (tach is accurate) leaned aggressively by ear (from just rough back to smooth) and backed up by a JPI EDM-700. So that's a reliable 135KTAS at around 9.0gph in the mid altitudes (2500rpm). Besides the steps off, K&N air filter, and powerflow (as required by the STC) my airplane is mostly stock and a bit bent.
-Brian
119ST (at) 2W6
[quote][b]
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teamgrumman(at)yahoo.com
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| Posted: Sat Feb 18, 2012 7:04 pm Post subject: Oil consumption has increased...maybe |
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Brian,
When I fly at high rpm (>2700), I always burn more oil. I don't think I've ever flown at 2500 rpm (smile).
Where do you keep the oil level?
On my plane, I have the breather out about 1 to 1 1/2 inches.
Check compressions for blow-by. An air-oil separator will only cost you money. I have 3 of the M-20 air-oil separators. I'd sell you one. (smile)
From: brian sandberg <sandbag23(at)msn.com>
To: Team Grumman <teamgrumman-list(at)matronics.com>
Sent: Saturday, February 18, 2012 6:09 PM
Subject: Oil consumption has increased...maybe
I've been losing more oil than usual so am now both tracking consumption more closely and looking for ways to decrease it.
Research had dissuaded me from considering air-oil separators. I'm going to do the trick of rerouting the breather hose in a higher arc under Gary's cowl. I'm wondering if there's a venturi effect going on too. The 'whistle' slot is way up inside. My question is how far should the tube extend from the Jaguar cowl? Same 1inch +/- 1/2inch? Gary is probably the only one who knows the pressures and flows enough to say.
So what happened? Maybe just normal engine wear on a mid-time engine, or maybe I'm running it harder because I can with the new cowl. By the way, I'm consistently seeing roughly 5-10 KTAS better than book with about .5 gph less than book for the given rpm (tach is accurate) leaned aggressively by ear (from just rough back to smooth) and backed up by a JPI EDM-700. So that's a reliable 135KTAS at around 9.0gph in the mid altitudes (2500rpm). Besides the steps off, K&N air filter, and powerflow (as required by the STC) my airplane is mostly stock and a bit bent.
-Brian
119ST (at) 2W6
[quote][b]
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flyv35b(at)minetfiber.com
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| Posted: Sun Feb 19, 2012 2:42 pm Post subject: Oil consumption has increased...maybe |
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On 2/18/2012 7:02 PM, Gary Vogt wrote:
| Quote: | Check compressions for blow-by. An air-oil separator will only cost you
money. I have 3 of the M-20 air-oil separators. I'd sell you one. (smile)
|
The M-20 is almost worthless!
Cliff
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BARRY CHECK 6
Joined: 15 Mar 2011
Posts: 738
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| Posted: Sun Feb 19, 2012 5:07 pm Post subject: Oil consumption has increased...maybe |
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No it's not Cliff...
It made a lot of money for the guy that holds the STC.
Barry
On Sun, Feb 19, 2012 at 5:42 PM, flyv35b <flyv35b(at)minetfiber.com (flyv35b(at)minetfiber.com)> wrote:
[quote]--> TeamGrumman-List message posted by: flyv35b <flyv35b(at)minetfiber.com (flyv35b(at)minetfiber.com)>
On 2/18/2012 7:02 PM, Gary Vogt wrote:
| Quote: | Check compressions for blow-by. An air-oil separator will only cost you
money. I have 3 of the M-20 air-oil separators. I'd sell you one. (smile)
|
The M-20 is almost worthless!
Cliff
====================================
List" target="_blank">http://www.matronics.com/Navigator?TeamGrumman-List
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le, List Admin.
="_blank">http://www.matronics.com/contribution
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[b]
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flyv35b(at)minetfiber.com
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| Posted: Mon Feb 20, 2012 6:04 am Post subject: Oil consumption has increased...maybe |
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On 2/19/2012 5:06 PM, FLYaDIVE wrote:
| Quote: | No it's not Cliff...
It made a lot of money for the guy that holds the STC.
Barry
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Duh! But still worthless (almost) at taking oil vapor out of the
crankcase breather and returning the oil back to the engine.
If you saw the oil (and water) that is being returned to the engine I
don't think you would want the air-oil separator. Heck, run it in to a
container and at least that way you can empty it once in awhile.
Cliff
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slacktide
Joined: 26 Jun 2010
Posts: 14
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| Posted: Mon Feb 20, 2012 5:49 pm Post subject: Oil consumption has increased...maybe |
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It can also be an effective tool to remove crank nose seals. Take an M20 out of service, put it in the freezer overnight, then cut it in half with a bandsaw. Tell me how it is supposed to function as a breather then...
DWB
On Mon, Feb 20, 2012 at 6:04 AM, flyv35b <flyv35b(at)minetfiber.com (flyv35b(at)minetfiber.com)> wrote:
[quote] --> TeamGrumman-List message posted by: flyv35b <flyv35b(at)minetfiber.com (flyv35b(at)minetfiber.com)>
On 2/19/2012 5:06 PM, FLYaDIVE wrote:
| Quote: | No it's not Cliff...
It made a lot of money for the guy that holds the STC.
Barry
|
Duh! But still worthless (almost) at taking oil vapor out of the crankcase breather and returning the oil back to the engine.
If you saw the oil (and water) that is being returned to the engine I don't think you would want the air-oil separator. Heck, run it in to a container and at least that way you can empty it once in awhile.
Cliff
====================================
List" target="_blank">http://www.matronics.com/Navigator?TeamGrumman-List
====================================
http://forums.matronics.com
====================================
le, List Admin.
="_blank">http://www.matronics.com/contribution
====================================
[b]
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teamgrumman(at)yahoo.com
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| Posted: Mon Feb 20, 2012 6:58 pm Post subject: Oil consumption has increased...maybe |
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you give it too much credit
From: flyv35b <flyv35b(at)minetfiber.com>
To: teamgrumman-list(at)matronics.com
Sent: Sunday, February 19, 2012 2:42 PM
Subject: Re: Oil consumption has increased...maybe
--> TeamGrumman-List message posted by: flyv35b <flyv35b(at)minetfiber.com (flyv35b(at)minetfiber.com)>
On 2/18/2012 7:02 PM, Gary Vogt wrote:
| Quote: | Check compressions for blow-by. An air-oil separator will only cost you
money. I have 3 of the M-20 air-oil separators. I'd sell you one. (smile)
|
The M-20 is a= - The TeamGrumman-List Email Forum -http://www.matronics.com/Navigator?TeamGrumman-List<========================
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