X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 11 Nov 2007 19:03:45 -0500 Message-ID: X-Original-Return-Path: Received: from [206.246.194.60] (HELO visi.net) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2465703 for lml@lancaironline.net; Sat, 10 Nov 2007 22:39:54 -0500 Received-SPF: none receiver=logan.com; client-ip=206.246.194.60; envelope-from=rpastusek@htii.com Received: from [69.143.130.212] (account rpastusek@htii.com HELO dlhtpax009) by visi.net (CommuniGate Pro SMTP 4.2) with ESMTP id 242266396 for lml@lancaironline.net; Sat, 10 Nov 2007 22:38:47 -0500 From: "Robert Pastusek" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: RE: [LML] #4 cylinder EGT X-Original-Date: Sat, 10 Nov 2007 22:39:07 -0500 X-Original-Message-ID: <008801c82414$6d1b2320$47516960$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0089_01C823EA.84451B20" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AcgjuamE9s0cO3gBSJKL24+Oz+S58gAWCOQQ Content-Language: en-us This is a multipart message in MIME format. ------=_NextPart_000_0089_01C823EA.84451B20 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Dan Reagan wrote: About 10 flight hours ago my #4 EGT dicided to start running about 150 degrees less than the others. This is a FADEC engine so there is a possibility of injector problems but other than that please give me some ideas what has changed. The temp shows approximate correct ambient temp when shut down overnight. Dan, Try to isolate whether this is a cylinder problem or a probe/connector problem by trading sensors and connections between cylinders if possible. If you have enough lead wire, switch EGT probes between #4 and another cylinder. Leave the probes connected to their original wires going to you monitor. Test run the engine. If #4 on your monitor still indicates 150 degrees low, you have a defective sensor or wiring. If the cold cylinder now shows to be the one that you swapped above, you have a problem with #4 cylinder. The more likely event is a defective probe or wiring. You can further isolate this by changing the probe connections so the #4 cylinder is again hooked to the wiring for #4 in your monitoring system. Use the same logic as above to decide whether you have a defective probe or bad wiring. Hope this helps. Bob P ------=_NextPart_000_0089_01C823EA.84451B20 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Dan Reagan wrote: =

About 10 flight hours ago my #4 = EGT dicided to start running about 150 degrees less than the others. = This is a FADEC engine so there is a possibility of injector problems but other = than that please give me some ideas what has changed. The temp shows approximate correct ambient temp when shut down = overnight.

Dan,

Try to isolate whether this is a cylinder problem or a probe/connector problem by trading sensors and connections between = cylinders if possible. If you have enough lead wire, switch EGT probes between #4 and = another cylinder. Leave the probes connected to their original wires going to = you monitor. Test run the engine. If #4 on your monitor still = indicates 150 degrees low, you have a defective sensor or wiring. If the cold cylinder = now shows to be the one that you swapped above, you have a problem with #4 cylinder.

The more likely event is a defective probe or = wiring. You can further isolate this by changing the probe connections so the #4 = cylinder is again hooked to the wiring for #4 in your monitoring system. = Use the same logic as above to decide whether you have a defective probe or bad = wiring.

Hope this helps.

Bob P

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