X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 24 May 2007 16:19:28 -0400 Message-ID: X-Original-Return-Path: Received: from [65.13.226.109] (HELO lucky.dts.local) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2065703 for lml@lancaironline.net; Thu, 24 May 2007 15:03:04 -0400 Received-SPF: none receiver=logan.com; client-ip=65.13.226.109; envelope-from=cjensen@dts9000.com Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C79E36.1C94BEA2" X-MimeOLE: Produced By Microsoft Exchange V6.5.6944.0 Subject: RE: [LML] LIVP Oil Pressure Question (TSIO550E)...Fluctuations Noted X-Original-Date: Thu, 24 May 2007 15:02:44 -0400 X-Original-Message-ID: <8984A39879F2F5418251CBEEC9C689B33E7883@lucky.dts.local> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] LIVP Oil Pressure Question (TSIO550E)...Fluctuations Noted Thread-Index: AceeMo4G06POXBS+TZG0Fe9SMfjYygAAxApw From: "Chuck Jensen" X-Original-To: "Lancair Mailing List" This is a multi-part message in MIME format. ------_=_NextPart_001_01C79E36.1C94BEA2 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Craig, =20 I agree that the presence of air in the line should not affect pulsing or the accuracy of the reading. This is counter-intuitive but air in an instrument line will often cause faulty pressure readings and can sometimes cause pulsing. =20 Rather than being a parts-replacing to fix this problem, perhaps Jeff should ensure there is no air in the line; then if the problem persists, start replacing parts, including the transducer. I'm unaware if pressure fluctuation is a failure mode for a transducer---others may pipe up. Chuck Jensen=20 -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Craig Berland Sent: Thursday, May 24, 2007 2:37 PM To: lml@lancaironline.net Subject: [LML] LIVP Oil Pressure Question (TSIO550E)...Fluctuations Noted Jeff, =20 I did not get the data plot in your email. However, here is my input. If the oil pressure fluctuates at idle with a warm engine, then I would say the VERY high odds are the transducer is sending out bad data. Reason...at warm idle the oil pressure relief is out of the picture. I would dismiss the trapped air theory because I can't think of a reason the air pressure would fluctuate rapidly. I would change the transducer. =20 Craig Berland ------_=_NextPart_001_01C79E36.1C94BEA2 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Craig,
 
I = agree that the=20 presence of air in the line should not affect pulsing or the accuracy of = the=20 reading.  This is counter-intuitive but air in an = instrument line will=20 often cause faulty pressure readings and can sometimes cause=20 pulsing.
 
Rather = than being a=20 parts-replacing to fix this problem, perhaps Jeff should ensure there is = no air=20 in the line; then if the problem persists, start replacing parts, = including the=20 transducer.  I'm unaware if pressure fluctuation is a failure mode = for a=20 transducer---others may pipe up.

Chuck Jensen

-----Original Message-----
From: Lancair Mailing List = [mailto:lml@lancaironline.net] On Behalf Of Craig = Berland
Sent:=20 Thursday, May 24, 2007 2:37 PM
To:=20 lml@lancaironline.net
Subject: [LML] LIVP Oil Pressure = Question=20 (TSIO550E)...Fluctuations Noted

Jeff,
 
I did=20 not get the data plot in your email.  However, here is my = input.  If=20 the oil pressure fluctuates at idle with a warm engine, then I would say = the=20 VERY high odds are the transducer is sending out bad data.  = Reason...at=20 warm idle the oil pressure relief is out of the picture.  I would = dismiss=20 the trapped air theory because I can't think of a reason the air = pressure would=20 fluctuate rapidly.  I would change the=20 transducer.
 
Craig=20 Berland
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