X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 15 Mar 2009 18:54:10 -0400 Message-ID: X-Original-Return-Path: Received: from QMTA02.emeryville.ca.mail.comcast.net ([76.96.30.24] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with ESMTP id 3548277 for lml@lancaironline.net; Sun, 15 Mar 2009 15:21:42 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.24; envelope-from=j.hafen@comcast.net Received: from OMTA06.emeryville.ca.mail.comcast.net ([76.96.30.51]) by QMTA02.emeryville.ca.mail.comcast.net with comcast id TRwM1b00316AWCUA2XM8xK; Sun, 15 Mar 2009 19:21:08 +0000 Received: from [10.0.1.200] ([98.247.31.160]) by OMTA06.emeryville.ca.mail.comcast.net with comcast id TXM51b00Y3THFyS8SXM6if; Sun, 15 Mar 2009 19:21:08 +0000 User-Agent: Microsoft-Entourage/12.15.0.081119 X-Original-Date: Sun, 15 Mar 2009 12:21:04 -0700 Subject: Re: [LML] Re: Reduced Fuel Flow From: John Hafen X-Original-To: Lancair Mailing List X-Original-Message-ID: Thread-Topic: [LML] Re: Reduced Fuel Flow Thread-Index: Acmloy7JvInC1CIKd0mBIGI0fXsnLQ== In-Reply-To: Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3319964466_3555097" > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3319964466_3555097 Content-type: text/plain; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable Walter: Thanks for this. You say leave the boost pump on for at least 30 minutes after reaching cruise altitude. After 30 minutes, at 21k feet, would you then turn the boost pump off? John Hafen IVP 110 hours On 3/14/09 4:32 AM, "Walter Atkinson" wrote: > Vapor lock in a fast climb to altitude is a common problem in TC'd aircra= ft > and can even be a problem in high performance NA aircraft. That's why we > recommend turning on the boost pump in most of these applications as one > passes through 10,000 feet in a climb. We also recommend leaving the boo= st > pump on for at least 30 min. after reaching cruise altitude so the fuel i= n the > tanks can cool off and will no longer be subject to vapor lock. Vapor lo= ck > essentially leans the mixture and will be noted by a rising EGT/TIT in th= e > climb--even wit the mixture remaining full rich. >=20 > Walter >=20 >=20 >=20 > On Mar 13, 2009, at 5:07 AM, farnsworth wrote: >=20 > =20 > Dr Katz, > =20 > About a year ago I had a similar problem with fuel flow reduction during > climb. It would cause increased temperature problems at the same altitude= s (14 > to 15,000=B9). > =20 > It turned out that I needed to have my fuel pump recalibrated by TCM in > Mobile. During this period I found I could increase the fuel flow about 5= GPH > by turning on the high boost pump. You might want to turn on the high boo= st > pump around 12,000=B9 and see if this doesn=B9t allow you to climb above 14,0= 00=B9 > without the CHTs going up. > =20 > Lynn Farnsworth > Super Legacy #235 > TSIO-550 Powered > Race #44 >=20 >=20 --B_3319964466_3555097 Content-type: text/html; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable Re: [LML] Re: Reduced Fuel Flow Walter:

Thanks for this.  You say leave the boost pump on for at least 30 &nbs= p;minutes after reaching cruise altitude.  After 30 minutes, at 21k fee= t, would you then turn the boost pump off?

John Hafen
IVP 110 hours


On 3/14/09 4:32 AM, "Walter Atkinson" <walter@advancedpilot.com> wrote:

<= SPAN STYLE=3D'font-size:11pt'>Vapor lock in a fast climb to altitude is a comm= on problem in TC'd aircraft and can even be a problem in high performance NA= aircraft.  That's why we recommend turning on the boost pump in most o= f these applications as one passes through 10,000 feet in a climb.  We = also recommend leaving the boost pump on for at least 30 min. after reaching= cruise altitude so the fuel in the tanks can cool off and will no longer be= subject to vapor lock.  Vapor lock essentially leans the mixture and w= ill be noted by a rising EGT/TIT in the climb--even wit the mixture remainin= g full rich.

Walter



On Mar 13, 2009, at 5:07 AM, farnsworth wrote:
Dr Katz,
 
About a year ago I had a similar problem with fuel flow reduction during cl= imb. It would cause increased temperature problems at the same altitudes (14= to 15,000’).
 
It turned out that I needed to have my fuel pump recalibrated by TCM in Mob= ile. During this period I found I could increase the fuel flow about 5 GPH b= y turning on the high boost pump. You might want to turn on the high boost p= ump around 12,000’ and see if this doesn’t allow you to climb ab= ove 14,000’ without the CHTs going up.
 
Lynn Farnsworth
Super Legacy #235
TSIO-550 Powered
Race #44


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