X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 15 Oct 2013 16:29:53 -0400 Message-ID: X-Original-Return-Path: Received: from [8.31.233.120] (HELO server209.appriver.com) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTPS id 6542050 for lml@lancaironline.net; Tue, 15 Oct 2013 16:08:42 -0400 Received-SPF: none receiver=logan.com; client-ip=8.31.233.120; envelope-from=gwbraly@gami.com X-Note-AR-ScanTimeLocal: 10/15/2013 4:02:46 PM X-Policy: GLOBAL - gami.com X-Policy: GLOBAL - gami.com X-Policy: GLOBAL - gami.com X-Primary: gwbraly@gami.com X-Note: This Email was scanned by AppRiver SecureTide X-Virus-Scan: V- X-Note-SnifferID: 0 X-Note: TCH-CT/SI:0-125/SG:5 10/15/2013 4:02:17 PM X-GBUdb-Analysis: 0, 68.89.254.181, Ugly c=0.609666 p=-0.929919 Source Normal X-Signature-Violations: 0-0-0-18386-c X-Note-419: 15.6004 ms. Fail:1 Chk:1350 of 1350 total X-Note: SCH-CT/SI:1-1350/SG:1 10/15/2013 4:02:39 PM X-Note: Spam Tests Failed: X-Country-Path: PRIVATE->UNITED STATES->LOCAL X-Note-Sending-IP: 68.89.254.181 X-Note-Reverse-DNS: 68-89-254-181.gami.com X-Note-Return-Path: gwbraly@gami.com X-Note: User Rule Hits: X-Note: Global Rule Hits: G340 G341 G342 G343 G347 G348 G457 X-Note: Encrypt Rule Hits: X-Note: Mail Class: VALID X-Note: Headers Injected Received: from [68.89.254.181] (HELO gamimail1.Gami.local) by server209.appriver.com (CommuniGate Pro SMTP 6.0.2) with ESMTPS id 65139589; Tue, 15 Oct 2013 16:02:46 -0400 Received: from gamimail1.Gami.local ([10.10.12.14]) by gamimail1.Gami.local ([10.10.12.14]) with mapi; Tue, 15 Oct 2013 15:02:44 -0500 From: George Braly X-Original-To: Steve Colwell , 'Lancair Mailing List' X-Original-CC: 'Neal George' X-Original-Date: Tue, 15 Oct 2013 15:02:43 -0500 Subject: RE: Oil Cooler Door Control on IO-550N Engine in Legacy? Thread-Topic: Oil Cooler Door Control on IO-550N Engine in Legacy? Thread-Index: Ac7Jxpm3jBZdS0q5TmqfxDBn1CyJwgABYTLgAAUpLRA= X-Original-Message-ID: References: <007101cec9dc$a48e7270$edab5750$@com> In-Reply-To: <007101cec9dc$a48e7270$edab5750$@com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_C273A1B35F3C6748B52EE0CC2FCEE96C02C2BB96D014gamimail1Ga_" MIME-Version: 1.0 --_000_C273A1B35F3C6748B52EE0CC2FCEE96C02C2BB96D014gamimail1Ga_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Steve, I have seen some hard data that pretty convincingly demonstrates that the t= emperature of the exhaust valve guide is very closely correlated with engin= e oil temperature. Since a significant portion of the heat transfer from the exhaust valve pas= ses up the stem and out through the valve guide - - keeping that temperatur= e low helps to manage the exhaust valve temperature. If you get the oil temperature hot enough so that the water boils off - - t= hat is hot enough. At altitude, water boils well below 212 d F. And = further, the oil temperature going through the various hot spots in the en= gine will be well above the average oil temperature reported by the engine= monitor. It does make some difference where you get the oil temperature= pick up. If you start to see evidence of water condensation on the dip stick - - the= n clearly the oil temperature at cruise is too low. My personal preference is to see the oil temperature go up to around 200d F= sometime during the climb and then to settle off in the 180-190dF range at= cruise. Regards, George From: Steve Colwell [mailto:mcmess1919@yahoo.com] Sent: Tuesday, October 15, 2013 2:28 PM To: 'Lancair Mailing List' Cc: 'Neal George'; George Braly Subject: Oil Cooler Door Control on IO-550N Engine in Legacy? Valin & Allyson, You will need to adjust the oil cooler door all year, on almost every fligh= t, to keep oil temps high enough. Typically we reset the door at cruise an= d on descent (and now in climb.) Prior to Neal George's Continental Forum = at Greenville, we used 175 degrees as the target. Neal recommends 200 degr= ees as the preferred setting. The door cable has enough load to require a = locking button, see: A-700 BUTTON LOCK DASH CONTROL http://www.aircraftspr= uce.com/catalog/appages/a700.php?clickkey=3D276832 An additional benefit = is reduced cooling drag. Neal also said 320 degrees is the minimum Cylinder Head Temp and the mid 20= 0's a lot of us have at cruise is too low. Steve and Claudette Colwell Legacy RG 550 Hey LML gang, Working on our IO-550N engine installation... Already have baffling done a= nd flapper door in front of oil cooler. We've heard mixed reports of wheth= er it is needed or not. We need to decide if we really need to have cockpi= t control of the door or not. We've heard some people just remove the door= or wire it open or closed depending on the season. Would appreciate hearing about your flight experience with the Legacy with = an IO-550N engine and the usefulness or not of control of the oil cooler do= or... Thanks! Valin & Allyson Thorn Legacy Project Boulder, Colorado --_000_C273A1B35F3C6748B52EE0CC2FCEE96C02C2BB96D014gamimail1Ga_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Steve,

 

= I have seen some hard data that pretty convin= cingly demonstrates that the temperature of the exhaust valve guide is very= closely correlated with engine oil temperature.

 

=

Since a significant port= ion of the heat transfer from the exhaust valve passes up the stem and out = through the valve guide - - keeping that temperature low helps to manage th= e exhaust valve temperature.

 

If you get the oil temperature hot enough so= that the water boils off - - that is hot enough.    At alti= tude,  water boils well below 212 d F.    And further,&= nbsp; the oil temperature going through the various hot spots in the engine= will be well above the average oil temperature reported by the  engin= e monitor.    It does make some difference where you get the= oil temperature pick up.

 

If you start to see evidence of water condensati= on on the dip stick - - then clearly the oil temperature at cruise is too l= ow. 

 

My personal preference is to see the oil temperature go up to a= round 200d F sometime during the climb and then to settle off in the 180-19= 0dF range at cruise.

 

Regards,  George

 

 

=

From: Steve Colwell [mailto:mcmess1919@yah= oo.com]
Sent: Tuesday, October 15, 2013 2:28 PM
To: 'L= ancair Mailing List'
Cc: 'Neal George'; George Braly
Subjec= t: Oil Cooler Door Control on IO-550N Engine in Legacy?

 

Valin & Allyson,

 

You will need to adjust th= e oil cooler door all year, on almost every flight, to keep oil temps high = enough.  Typically we reset the door at cruise and on descent (and now= in climb.)  Prior to Neal George’s Continental Forum at Greenvi= lle, we used 175 degrees as the target.  Neal recommends 200 degrees a= s the preferred setting.  The door cable has enough load to require a = locking button, see:  A-700 BUTTON LOCK DASH CONTROL = http://www.aircraftspruce.com/catalog/appages/a700.php?clickkey=3D276832   An additional benefit is reduce= d cooling drag.

 

Neal also said 320 degrees is the minimum Cylinder Head = Temp and the mid 200’s a lot of us have at cruise is too low.  <= o:p>

 

Steve and Claudette Colwell  Legacy RG 550

 

<= p class=3DMsoNormal> <= /p>

Hey LML gang,

 

Working on our IO-550N engine installation… = ; Already have baffling done and flapper door in front of oil cooler. = We’ve heard mixed reports of whether it is needed or not.  We n= eed to decide if we really need to have cockpit control of the door or not.=   We’ve heard some people just remove the door or wire it open o= r closed depending on the season.

 

Would appreciate hearing about your flight experience with the Legacy wi= th an IO-550N engine and the usefulness or not of control of the oil cooler= door…

&= nbsp;

Thanks!=

 

<= p class=3DMsoNormal>Valin & Allyson Thorn

Legacy Project

Boulder, Colorado

 

 

= --_000_C273A1B35F3C6748B52EE0CC2FCEE96C02C2BB96D014gamimail1Ga_--