X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 05 Nov 2012 16:35:08 -0500 Message-ID: X-Original-Return-Path: Received: from mail-ie0-f180.google.com ([209.85.223.180] verified) by logan.com (CommuniGate Pro SMTP 6.0c2) with ESMTPS id 5862910 for lml@lancaironline.net; Mon, 05 Nov 2012 12:01:09 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.223.180; envelope-from=bakercdb@gmail.com Received: by mail-ie0-f180.google.com with SMTP id e10so7331496iej.25 for ; Mon, 05 Nov 2012 09:00:35 -0800 (PST) MIME-Version: 1.0 Received: by 10.50.196.193 with SMTP id io1mr10135494igc.59.1352134835395; Mon, 05 Nov 2012 09:00:35 -0800 (PST) Received: by 10.64.32.234 with HTTP; Mon, 5 Nov 2012 09:00:35 -0800 (PST) In-Reply-To: References: X-Original-Date: Mon, 5 Nov 2012 17:00:35 +0000 X-Original-Message-ID: Subject: Re: [LML] Oil going overboard From: Clark Baker X-Original-To: Lancair Mailing List X-Original-Cc: dballin@gmail.com Content-Type: multipart/alternative; boundary=14dae93411f58d5bad04cdc26c2f --14dae93411f58d5bad04cdc26c2f Content-Type: text/plain; charset=ISO-8859-1 Dan, I had the same issue (and almost exact setup it sounds like). My Legacy has a 10:1 from Barrett, the Aerochia 12(+) quart pan, and breather into the exhaust. I had no separator, and I have cowl flaps. At lower altitudes during break-in (8k and below), all was fine. Then, at about 75hrs I did my first flight up high (17,500). After 2.5hrs, I landed and was shocked to have to add 3+qts (the engine had been using nominal amounts of oil down low). I took off again, straight up to 17,500. After about 3hrs at 17,500, my low oil level light illuminated (I have a level sensor). I diverted and found that I had lost 4+qts over those 3hrs. I measured the pressure in my breather tube also, and got ~+2" H2O with the cowl flaps closed. So, I moved the breather exit to the cowl exit area from the exhaust. I also added an Andair air/oil separator and catch can (to keep oil off the belly. Fred Moreno and others, much more educated than myself in the the area, have some theories about pressure differentials and engine design, but thankfully this seems to have solved the problem for me. Clark Legacy, 130hrs TT On Mon, Nov 5, 2012 at 4:39 PM, Dan Ballin wrote: > I am flying a Lancair Legacy with an IO-550 10:1 compression - > Performance engine that has been inspected and rebuilt about 60 hrs > ago. I have had a problem, which I attributed to new cylinder/rings, > with excessive oil consumption. Initially I was using about a qt an > hour and this improved at about 15 hrs. Seemed like normal break in. > Then one flight back from the coast of OR (Sea Level - I fly out of > Bend - 3500 ft), I started losing oil pressure. When I landed after > the hour flight I had about 5 qts left. I started with 9. I > attributed it to a crazy idea I had to hook the breather tube into the > exhaust. I was getting really tired of cleaning the bottom of the > plane and my hangar floor. I disconnected it and flew and problem > solved. Just recently on a trip back East the same thing happened. > Got to Rawlings, Wy 8.5 qts running grat no problems. Next stop about > 1.5 hrs, 2 added qts. On my way to Kansas City oil pressure dropping > slowly so I diverted and now I was down to 4-5 qts. After spending > the night in Kansas city and buying a case of oil, I flew back to > Bend. Used 1/2 qt in 6 hrs. > > So a few things. I have a 12 qt oil pan, I have an air/oil separator, > I checked my crank pressure by hooking a pressure gauge to the > breather (before the separator) and it is high somewhere in the 4-5 > psi. I did a compression check and. > > OK so why intermittently dumping from the oil breather? > > -- > For archives and unsub > http://mail.lancaironline.net:81/lists/lml/List.html > --14dae93411f58d5bad04cdc26c2f Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Dan,=A0
I had the same issue (and almost exact setup it sounds like).
My Legacy has a 10:1 from Barrett, the Aerochia 12(+) quart pan, a= nd breather into the exhaust. =A0I had no separator, and I have cowl flaps.=

At lower altitudes during break-in (8k and below), all = was fine. =A0Then, at about 75hrs I did my first flight up high (17,500). = =A0After 2.5hrs, I landed and was shocked to have to add 3+qts (the engine = had been using nominal amounts of oil down low). =A0I took off again, strai= ght up to 17,500. =A0After about 3hrs at 17,500, my low oil level light ill= uminated (I have a level sensor). =A0I=A0diverted=A0and found that I had lo= st 4+qts over those 3hrs.

I measured the pressure in my breather tube also, and g= ot ~+2" H2O with the cowl flaps closed.=A0So, I moved the=A0breather=A0exit = to the cowl exit area from the exhaust. =A0I=A0also added an Andair air/oiloil= =A0off=A0the belly.


Fred Moreno and others, much m= ore educated than myself in the the area, have some theories about pressure= differentials and engine design, but thankfully this seems to have solved = the problem for me.

Clark
Legacy, 130hrs TT
<= div>
On Mon, Nov 5, 2012 at 4:39 PM, Dan Ball= in <dballin@gmail.com> wrote:
I am flying a Lancair Legacy with an IO-550 = =A010:1 compression -
Performance engine that has been inspected and rebuilt about 60 hrs
ago. =A0 I have had a problem, which I attributed to new cylinder/rings, with excessive oil consumption. =A0Initially I was using about a qt an
hour and this improved at about 15 hrs. =A0Seemed like normal break in.
Then one flight back from the =A0coast of OR (Sea Level - I fly out of
Bend =A0- 3500 ft), I started losing oil pressure. =A0When I landed after the hour flight I had about 5 qts left. =A0I started with 9. =A0I
attributed it to a crazy idea I had to hook the breather tube into the
exhaust. =A0I was getting really tired of cleaning the bottom of the
plane and my hangar floor. =A0 I disconnected it and flew and problem
solved. =A0Just recently on a trip back East the same thing happened.
Got to Rawlings, Wy 8.5 qts running grat no problems. =A0Next stop about 1.5 hrs, 2 added qts. =A0On my way to Kansas City oil pressure dropping
slowly so I diverted and now I was down to 4-5 qts. =A0After spending
the night in Kansas city and buying a case of oil, I flew back to
Bend. =A0Used 1/2 qt in 6 hrs.

So a few things. =A0I have a 12 qt oil pan, I have an air/oil separator, I checked my crank pressure by hooking a pressure gauge to the
breather (before the separator) and it is high somewhere in the 4-5
psi. =A0I did a compression check and.

OK so why intermittently dumping from the oil breather?

--
For archives and unsub http://mail.lancaironline.net:81/lists/lml/L= ist.html


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