X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-iy0-f180.google.com ([209.85.210.180] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with ESMTPS id 5040924 for flyrotary@lancaironline.net; Sun, 03 Jul 2011 01:02:31 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.210.180; envelope-from=rwstracy@gmail.com Received: by iyh42 with SMTP id 42so6320530iyh.25 for ; Sat, 02 Jul 2011 22:01:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=subject:references:from:content-type:x-mailer:in-reply-to :message-id:date:to:content-transfer-encoding:mime-version; bh=UhhlGxHyol4QXozOTMNvMqXr59qMhCskXs4cgd2nqkI=; b=l505iQhRHCfcoCGX6rWzsOOmyGnGnhF8vHf8MqMTc9WHpnTaNY80lc50ea0mIAmZ/G X4FArdVy6SK/IwRnwqf6KRw/nw7Lhn71DH0gCrg9EJ4Pfwj4BwUoW2g8Ytti5uPMZyTF 5JBv46iDoRe2jaFYl1rRz0SgFVq28ZGpYizlg= Received: by 10.42.168.2 with SMTP id u2mr5588208icy.317.1309669316702; Sat, 02 Jul 2011 22:01:56 -0700 (PDT) Return-Path: Received: from [10.0.1.3] (99-197-145-127.cust.wildblue.net [99.197.145.127]) by mx.google.com with ESMTPS id s2sm5065130icw.17.2011.07.02.22.01.48 (version=TLSv1/SSLv3 cipher=OTHER); Sat, 02 Jul 2011 22:01:55 -0700 (PDT) Subject: Re: [FlyRotary] Re: EGT and EM2 References: From: Tracy Content-Type: multipart/alternative; boundary=Apple-Mail-2-649625326 X-Mailer: iPad Mail (8F191) In-Reply-To: Message-Id: <2803E633-38E9-4CA3-B1AC-84FB3EC90757@gmail.com> Date: Sun, 3 Jul 2011 01:01:32 -0400 To: Rotary motors in aircraft Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (iPad Mail 8F191) --Apple-Mail-2-649625326 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Shielded probes do help. Most EGT probes have shields but the same thing ap= plies to any extension wire used. Tracy Sent from my iPad On Jul 2, 2011, at 10:58 PM, Thomas Mann wrote: > Tracy ..... does shielded wiring help avoid this issue? >=20 >=20 > On Sat, Jul 2, 2011 at 9:49 PM, Tracy wrote: > Thought I had commented on this before. This symptom is most likely caus= ed by impulse noise from routing the EGT lines too close to ignition leads o= r other high noise Sources. The thermocouples generate low level signals in= the millivolt range so it doesn't take much to spike the reading. =20 >=20 > Tracy >=20 > Sent from my iPad >=20 > On Jul 2, 2011, at 9:22 PM, Chris Barber wrote= : >=20 >> I have written about this before but continue to have issues.=20 >>=20 >> =20 >>=20 >> My EGT readings are inconsitant. They seem to give what would seem to be= a correct reading but then seem to cycles to much higher readings. So, it m= ay show 1500 but then jump to 3000, then 6500 then 7200 (or whatever) and th= en start from what seems to be low to high. >>=20 >> =20 >>=20 >> I have not been sitting on my hands fretting. I had sent the unit back t= o Tracy and mentioned it and he found nothing amiss. Since then I have repl= aced all connections to the EM2, new thermalwire, new connectors and now new= sensors from "thesensorconnnection" all to no avail. While not flight esse= ntial, I hate that I can't solve the problem. I tire of throwing money and t= ime at it. I have looked at grounds, redid connections and tried a few diff= erent connections methods (where I connect the thermal wire from the EM2 to t= he thermalwire from the actual EGT connector. >>=20 >> =20 >>=20 >> This is becomeing a real annoyance. I am currently finishing up my A/C i= nstall (95% done) and them I am back to my first squawk list...quite short n= ow) before I have a squawk "party...yeah, yall are all invited....not time, j= ust show up, I will do what I can to make it a party ;-)) before I pay a DAR= . >>=20 >> =20 >>=20 >> Ya'll's input is appreciated. >>=20 >> =20 >>=20 >> Chris Barber >>=20 >> Velocity N17010 >>=20 >> Houston, Texas >>=20 >> 13b Turbo/Mistral Intake >>=20 >=20 --Apple-Mail-2-649625326 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=utf-8
Shielded probes do help.  Most EGT probes have shields but the same thing applies to any extension wire used.

Tracy

Sent from my iPad

On Jul 2, 2011, at 10:58 PM, Thomas Mann <thomasmann51@gmail.com> wrote:

Tracy ..... does shielded wiring help avoid this issue?


On Sat, Jul 2, 2011 at 9:49 PM, Tracy <rwstracy@gmail.com> wrote:
Thought I had commented on this before.   This symptom is most likely caused by impulse noise from routing the EGT lines too close to ignition leads or other high noise Sources.  The thermocouples generate low level signals in the millivolt range so it doesn't take much to spike the reading.   

Tracy

Sent from my iPad

On Jul 2, 2011, at 9:22 PM, Chris Barber <cbarber@texasattorney.net> wrote:

I have written about this before but continue to have issues. 

 

My EGT readings are inconsitant.  They seem to give what would seem to be a correct reading but then seem to cycles to much higher readings.  So, it may show 1500 but then jump to 3000, then 6500 then 7200 (or whatever) and then start from what seems to be low to high.

 

I have not been sitting on my hands fretting.  I had sent the unit back to Tracy and mentioned it and he found nothing amiss.  Since then I have replaced all connections to the EM2, new thermalwire, new connectors and now new sensors from "thesensorconnnection" all to no avail.  While not flight essential, I hate that I can't solve the problem.  I tire of throwing money and time at it.  I have looked at grounds, redid connections and tried a few different connections methods (where I connect the thermal wire from the EM2 to the thermalwire from the actual EGT connector.

 

This is becomeing a real annoyance.  I am currently finishing up my A/C install (95% done) and them I am back to my first squawk list...quite short now) before I have a squawk "party...yeah, yall are all invited....not time, just show up, I will do what I can to make it a party ;-)) before I pay a DAR.

 

Ya'll's input is appreciated.

 

Chris Barber

Velocity N17010

Houston, Texas

13b Turbo/Mistral Intake


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