X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 13 Jul 2010 20:35:01 -0400 Message-ID: X-Original-Return-Path: Received: from crystalvlin1.inetu.net ([209.235.254.29] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with ESMTPS id 4391309 for lml@lancaironline.net; Tue, 13 Jul 2010 12:36:02 -0400 Received-SPF: none receiver=logan.com; client-ip=209.235.254.29; envelope-from=ronr@advanceddesign.com Received: (qmail 7160 invoked by uid 89); 13 Jul 2010 16:35:24 -0000 Received: from unknown (HELO HP68182789221) (64.140.206.227) by crystalvlin1.inetu.net with SMTP; 13 Jul 2010 16:35:24 -0000 X-Original-Message-ID: <9E90111E6C3F454787C9F9D0092A025C@adm2k.local> From: "Ron Raby" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Fuel Control problem X-Original-Date: Tue, 13 Jul 2010 12:29:32 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0033_01CB2287.0BAB5BE0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5931 This is a multi-part message in MIME format. ------=_NextPart_000_0033_01CB2287.0BAB5BE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Steve I thought 27-28 was the right fuel flow for the IO550N? Ron Raby ES ----- Original Message -----=20 From: Steve Colwell=20 To: lml@lancaironline.net=20 Sent: Tuesday, July 13, 2010 5:51 AM Subject: [LML] Fuel Control problem On another point - you say you lean to 1300 degrees on climb out. I = am surprised by 1300 degrees. (Although I know that EGTs can differ = according to installation, and since I have a 10:1 compression engine my = EGTs should be lower.)=20 I arrived at 1300 degrees as recommended at the Advanced Pilot Seminar = after Sun n Fun last year. Assuming you have a fuel flow of at least 29 = gallons per hour (they say 30 is better) on a stock IO550-N, look for = the hottest EGT on the hottest cylinder (mine is #6) during takeoff to = about 150' agl on a near sea level runway. They say this is a safe = number to continue to lean to during the climb. =20 =20 How much ROP are you when you climb? I'll have to check. =20 Steve Colwell Legacy almost stock IO550-N with stock pistons =20 =20 =20 =20 From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of = Douglas Brunner Sent: Monday, July 12, 2010 2:53 PM To: lml@lancaironline.net Subject: [LML] Re: Fuel Control problem =20 Steve, =20 I always put on low boost above 10,000 for "vapor suppression". On = several occasions, I have experienced fluctuating decreases in RPM that = I attributed to "vapor in the lines". Putting on the low boost seemed = to solve the problem. =20 From what I remember of the Advanced Pilots Course (I took it in Jan = of '06), they suggested that the problem occurs with hot fuel at high = altitudes - and your story seems to be just that. Suggest you try using = low boost over 10,000. =20 On another point - you say you lean to 1300 degrees on climb out. I = am surprised by 1300 degrees. (Although I know that EGTs can differ = according to installation, and since I have a 10:1 compression engine my = EGTs should be lower.) I lean to 1100 in the climb until I reach 70% = power at which time I lean to 1200. Since my peak EGTs are around 1325 = (when I lean at 70% - probably higher at higher power settings), I = figure I am at least 250 ROP when above 70% in the climb. =20 If you lean to 1300 in the climb, what do you think your peak EGTs = are? How much ROP are you when you climb? =20 If there are any "lurkers" from APS, what do you think of 1300? =20 ------=_NextPart_000_0033_01CB2287.0BAB5BE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Steve
 
I thought 27-28 was the right fuel flow = for the=20 IO550N?
 
Ron Raby
 
ES
----- Original Message -----
From:=20 Steve=20 Colwell
Sent: Tuesday, July 13, 2010 = 5:51=20 AM
Subject: [LML] Fuel Control = problem

On another point = =96 you say you=20 lean to 1300 degrees on climb out.  I am surprised by 1300 = degrees. =20 (Although I know that EGTs can differ according to installation, and = since I=20 have a 10:1 compression engine my EGTs should be lower.)=20

I arrived at = 1300=20 degrees as recommended at the Advanced Pilot Seminar after Sun n Fun = last=20 year.  Assuming you have a fuel flow of at least 29 gallons per = hour=20 (they say 30 is better) on a stock IO550-N, look for the hottest EGT = on the=20 hottest cylinder (mine is #6) during takeoff to about 150=92 agl on = a near=20 sea level runway.  They say this is a safe number to continue = to lean=20 to during the climb. =20

 

How much ROP are = you when you=20 climb?

I=92ll have = to=20 check.

 

Steve=20 Colwell   Legacy  almost stock IO550-N  with stock = pistons

 

 

 

 

From: Lancair = Mailing=20 List [mailto:lml@lancaironline.net] On Behalf Of Douglas=20 Brunner
Sent: Monday, July 12, 2010 2:53 PM
To:=20 lml@lancaironline.net
Subject: [LML] Re: Fuel Control=20 problem

 

Steve,

 

I always put on = low boost=20 above 10,000 for =93vapor suppression=94.  On several occasions, = I have=20 experienced fluctuating decreases in RPM that I attributed to =93vapor = in the=20 lines=94.  Putting on the low boost seemed to solve the=20 problem.

 

From what I = remember of the=20 Advanced Pilots Course (I took it in Jan of =9206), they suggested = that the=20 problem occurs with hot fuel at high altitudes =96 and your = story seems=20 to be just that.  Suggest you try using low boost over=20 10,000.

 

On another point = =96 you say you=20 lean to 1300 degrees on climb out.  I am surprised by 1300 = degrees. =20 (Although I know that EGTs can differ according to installation, and = since I=20 have a 10:1 compression engine my EGTs should be lower.)   I = lean to=20 1100 in the climb until I reach 70% power at which time I lean to = 1200. =20 Since my peak EGTs are around 1325 (when I lean at 70% - probably = higher at=20 higher power settings), I figure I am at least 250 ROP when above 70% = in the=20 climb.

 

If you lean to = 1300 in the=20 climb, what do you think your peak EGTs are?

How much ROP are = you when you=20 climb?

 

If there are any = =93lurkers=94=20 from APS, what do you think of 1300?

 

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