X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml Date: Sat, 23 Sep 2006 22:00:07 -0400 Message-ID: X-Original-Return-Path: Received: from wx-out-0506.google.com ([66.249.82.239] verified) by logan.com (CommuniGate Pro SMTP 5.1c.4) with ESMTP id 1416797 for lml@lancaironline.net; Sat, 23 Sep 2006 10:28:00 -0400 Received-SPF: pass receiver=logan.com; client-ip=66.249.82.239; envelope-from=akadamson@gmail.com Received: by wx-out-0506.google.com with SMTP id i29so1276001wxd for ; Sat, 23 Sep 2006 07:27:20 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:from:to:subject:date:message-id:mime-version:content-type:x-mailer:x-mimeole:thread-index:in-reply-to:sender; b=Ak5AXCg+nbuTHFPR/oZ8NNpDKbgyrSXrs/jPY9cfwiwn8sHUHVDZfFtzzORL7yzbm7JBwAoqwR6/BFjiDqeCYiNrOad5tTALrpuZEL93RYj5dOy8vPnt6uq92SFd/obgRAaF/c8HnLt+91+Zu5RU50czk+2eDBYaiGP7YCX9fVo= Received: by 10.70.34.3 with SMTP id h3mr3226244wxh; Sat, 23 Sep 2006 07:27:20 -0700 (PDT) X-Original-Return-Path: Received: from Typhoon ( [68.68.82.92]) by mx.gmail.com with ESMTP id h8sm486783wxd.2006.09.23.07.27.19; Sat, 23 Sep 2006 07:27:19 -0700 (PDT) From: "Alan K. Adamson" X-Original-To: "'Lancair Mailing List'" Subject: RE: [LML] Re: Boost pump switching X-Original-Date: Sat, 23 Sep 2006 10:27:23 -0400 X-Original-Message-ID: <00d001c6df1c$631d49e0$2201a8c0@highrf.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D1_01C6DEFA.DC0BA9E0" X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 Thread-Index: AcbfFmhfySyPz98oTIKY2wanGrWhKAABbVUg In-Reply-To: X-Original-Sender: Alan Adamson This is a multi-part message in MIME format. ------=_NextPart_000_00D1_01C6DEFA.DC0BA9E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Thanks all for continued replies. Just to complete the information set. I'm building a Legacy, and will be installing a NA IO-550. Thanks, Alan _____ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Carl La Rue Sent: Saturday, September 23, 2006 9:45 AM To: Lancair Mailing List Subject: [LML] Re: Boost pump switching Alan, I've read the posts in response to your original post. I've also reviewed your original and you don't say whether or not you are normally aspirated. Regardless, some of the answers you received conflict with my real life experience so I'll recount it for you and then retire; I don't intend to get trapped in endless conjecturing. I fly a L IVP with a TSIO 550 B2B engine. It is set up with a low boost, high boost and a push button prime, like one of your responders. Low boost is always used above 10,000 feet. On two occasions I forgot the low boost and encountered rough running and then engine surges at about 18,000 to 20,000 feet. Turning low boost on immediately corrected the problem. About five years ago my engine quit at 400 feet, immediately after takeoff from Port Columbus, OH, westbound over the city. No time to think. I turned high boost on, IAW my understanding of the engine's needs (thanks, Charlie Kohler) and it immediately recovered. I climbed out in disbelief of what happened, stayed within easy gliding range of a recovery airport and leveled off at 10,000 feet. The engine was running perfectly. I then turned the high boost off to see what would happen so I would have a more complete picture for the mechanic. It instantly quit again. For the remainder of the flight it ran normally on high boost, even at idle in the high, emergency pattern I used for landing. It ran normally taxiing in. The engine shop quickly found that the engine driven fuel pump had suffered a catastrophic failure. IMHO, the high boost pump worked as designed. Good luck on your project. Carl La Rue L IVP 1560 hrs. _____ ------=_NextPart_000_00D1_01C6DEFA.DC0BA9E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Thanks all for continued = replies.
 
Just to complete the information set. I'm = building a=20 Legacy, and will be installing a NA IO-550. 
 
Thanks,
Alan

From: Lancair Mailing List=20 [mailto:lml@lancaironline.net] On Behalf Of Carl La = Rue
Sent:=20 Saturday, September 23, 2006 9:45 AM
To: Lancair Mailing=20 List
Subject: [LML] Re: Boost pump = switching

Alan,

 

I’ve = read the posts in=20 response to your original post.  I’ve also reviewed your = original and you=20 don’t say whether or not you are normally aspirated.  = Regardless, some of=20 the answers you received conflict with my real life experience so = I’ll recount=20 it for you and then retire; I don’t intend to get trapped in = endless=20 conjecturing.

 

I fly a L IVP = with a=20 TSIO 550 B2B engine.  It is set up with a low boost, high boost and = a push=20 button prime, like one of your responders.  Low boost is always = used above=20 10,000 feet.  On two occasions I forgot the low boost and = encountered rough=20 running and then engine surges at about 18,000 to 20,000 feet.  = Turning low=20 boost on immediately corrected the problem.

 

About five = years ago my=20 engine quit at 400 feet, immediately after takeoff from Port Columbus, = OH,=20 westbound over the city.  No time to think.  I turned high = boost on,=20 IAW my understanding of the engine’s needs (thanks, = Charlie Kohler) and it immediately = recovered.  I=20 climbed out in disbelief of what happened, stayed within easy gliding = range of a=20 recovery airport and leveled off at 10,000 feet.  The engine was = running=20 perfectly. I then turned the high boost off to see what would happen so = I would=20 have a more complete picture for the mechanic.  It instantly quit=20 again.  For the remainder of the flight it ran normally on high = boost, even=20 at idle in the high, emergency pattern I used for landing.  It ran = normally=20 taxiing in.  The engine shop quickly found that the engine driven = fuel pump=20 had suffered a catastrophic failure.

 

IMHO, the = high boost=20 pump worked as designed.  Good luck on your=20 project.

 

Carl La=20 Rue

L IVP 1560=20 hrs.

 

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