X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 14 Sep 2006 09:42:19 -0400 Message-ID: X-Original-Return-Path: Received: from imo-d21.mx.aol.com ([205.188.144.207] verified) by logan.com (CommuniGate Pro SMTP 5.1c.4) with ESMTP id 1402021 for lml@lancaironline.net; Wed, 13 Sep 2006 20:27:43 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.144.207; envelope-from=JIMRHER@aol.com Received: from JIMRHER@aol.com by imo-d21.mx.aol.com (mail_out_v38_r7.6.) id q.c31.3052946 (57365) for ; Wed, 13 Sep 2006 20:26:58 -0400 (EDT) From: JIMRHER@aol.com X-Original-Message-ID: X-Original-Date: Wed, 13 Sep 2006 20:26:58 EDT Subject: Backfires LOP X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1158193618" X-Mailer: 9.0 Security Edition for Windows sub 5324 X-Spam-Flag: NO -------------------------------1158193618 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Phil wrote; Anyone had experience with this? Pilot flying our IVP (TSIO550E3B with 4 blade MT) and reports: "Had backfires(?) couple of nights back. Was running lean of peak with temps 1590 at FL150, around -15C, light rain, 29Hg 2500rpm . Happened twice so went rich of peak for remainder of flight with no problems. Any reason come to mind?" Be grateful for any thoughts Phil Sexton Melbourne Phil; I have had one backfire (afterfire) that got my attention while going LOP. I have a 4P with TISO 550E. I had about 30 hrs on a new overhaul and was just going to test it LOP. Previously, I had 300 hrs on the 4P with about 50 of those hours LOP. So when I tried it, just like in the past, it gave one big pop. I didn't try that again. But while looking for why I had a strange vibration in this new engine I found that one injector had a piece of dirt in it and it caused the EGT for that cylinder to run slightly higher than the others while ROP. After cleaning the injectors the vibration was gone and the LOP works correctly again. Without GAMI's, which I should have anyway. The engine will pop if too lean, and in this case one cylinder got too lean. I wouldn't just accept that this would not do any harm. I have heard of very bad things happening if it blows off a hose from the Turbo. Like loss of pressurization, engine stopping and won't start at that high altitude, etc. As a side bar, I don't run LOP anymore unless I need to stretch the range. This after replacing all 6 cylinders at 215 hrs from new and then the second set after only 82 hrs. Both times the exhaust valve stems and guides were out of serviceable tolerance. This could be a very long thread but will have to wait. Also, I lost one Mag, from water in the cap from pressurization moisture, just like Carl Cadwell said. But mine didn't show up in the air, it just wouldn't work on the next flight Mag, check. I have since Inspected the Mag. every 100 hrs. There is a very small weeping drain hole in the high voltage cavity that can and did get plugged. For what it's worth, Jim Hergert L4P, N6XE (An Sexy) 408 hrs. -------------------------------1158193618 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
Phil wrote;

Anyone had experience with this?
Pilot flying our IVP (TSIO550E3= B=20 with 4 blade MT) and reports:
"Had backfires(?) couple of nights back. Wa= s=20 running lean of peak with  
temps 1590 at FL150, around -15C, light=20 rain,  29Hg 2500rpm .
Happened twice so went rich of peak for remain= der=20 of flight with no  
problems. Any reason come to mind?"
Be gratef= ul=20 for any thoughts

Phil Sexton
Melbourne
 
Phil;
 
I have had one backfire=20 (afterfire) that got my attention while going LOP. I have a 4P with TIS= O=20 550E. I had about 30 hrs on a new overhaul and was just going to test it LOP= .=20 Previously, I had 300 hrs on the 4P with about 50 of those hours LOP. So whe= n I=20 tried it, just like in the past, it gave one big pop. I didn't try that agai= n.=20 But while looking for why I had a strange vibration in this new engine I fou= nd=20 that one injector had a piece of dirt in it and it caused the EGT for that=20 cylinder to run slightly higher than the others while ROP. After cleaning th= e=20 injectors the vibration was gone and the LOP works correctly again. Without=20 GAMI's, which I should have anyway. The engine will pop if too lea= n,=20 and in this case one cylinder got too lean. I wouldn't just accept that this= =20 would not do any harm. I have heard of very bad things happening if it blows= off=20 a hose from the Turbo. Like loss of pressurization, engine stopping and won'= t=20 start at that high altitude, etc.
 
As a side bar, I don't r= un LOP=20 anymore unless I need to stretch the range. This after replacing all 6 cylin= ders=20 at 215 hrs from new and then the second set after only 82 hrs. Both times th= e=20 exhaust valve stems and guides were out of serviceable tolerance. This could= be=20 a very long thread but will have to wait.
 
Also, I lost one Mag, fr= om water=20 in the cap from pressurization moisture, just like Carl Cadwell said. But mi= ne=20 didn't show up in the air, it just wouldn't work on the next flight Mag, che= ck.=20 I have since Inspected the Mag. every 100 hrs. There is a very small weeping= =20 drain hole in the high voltage cavity that can and did get plugged.
 
For what it's worth,
Jim Hergert
L4P, N6XE
(An Sexy)
408=20 hrs.
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