X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from lincoln.lisco.com ([69.18.32.37] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTP id 6003120 for flyrotary@lancaironline.net; Wed, 09 Jan 2013 12:51:30 -0500 Received-SPF: none receiver=logan.com; client-ip=69.18.32.37; envelope-from=rob@mum.edu Received: from robertsdellxp (76-76-234-12.lisco.net [76.76.234.12]) by lincoln.lisco.com (Postfix) with SMTP id 2B72E2BEED for ; Wed, 9 Jan 2013 11:50:57 -0600 (CST) Message-ID: <6D8F7A8F60194692A9CB08136527A678@robertsdellxp> From: "Rob" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Aeroquip hose changed to hiccup Date: Wed, 9 Jan 2013 11:50:56 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0079_01CDEE5F.95EACFB0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 This is a multi-part message in MIME format. ------=_NextPart_000_0079_01CDEE5F.95EACFB0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Bill, Another thing you might check. I had a similer problem to yours in my fuel injected Ford V6 BD-4 with = Tracys EC2 and EM2. For about a year I was plagued, while flying, with a = brief miss with a jerk from the engine at random times even hours apart. = It would mostly happen at higher RPM's then cruise, but sometimes at = cruise. I checked everything I could think of. My problem was that one or two of my ignition wires (MSD's 8.5mm Super = Conductor wire set, brand new no less) had some intermittent connectors. = I discovered this by checking the resistance of each wire while working = the connectors a little bit to see if the resistance fluctuated = excessively or even became an open circuit. Once I fixed these = intermittents my problem was solved.=20 I know how unsettleing this can be while flying. I hope you find your = problem. Robert Bollinger ----- Original Message -----=20 From: Ernest Christley=20 To: Rotary motors in aircraft=20 Sent: Wednesday, January 09, 2013 8:38 AM Subject: [FlyRotary] Re: Aeroquip hose changed to hiccup A problem that mimics a poorly wired VR sensor, but=20 -only happens occasionally,=20 -with various levels of "response" -and is getting worse. Bill, if you haven't done so already, I would suggest changing the = wiring to the VR sensor completely. It sounds to me like a textbook = example of the worst sort of electronic malfunction you can have=85an = intermittent open. You'll never find it under normal test conditions, = and it will manifest at the most inopportune times. The only way to = completely rule it out as a failure scenario is to completely replace = the circuit path. On Jan 8, 2013, at 11:42 PM, Bill Bradburry wrote: No, I have the 2.85 gearbox. I have the MT electric prop, so I fly = WOT and use the prop to govern the engine speed. =20 I have changed the plugs with no effect. The mixture is fine when = this is happening. Fuel pressure also. I had an incident once on take = off like you describe where the plane was backfiring like crazy just = after I lifted off. I had the mixture too rich. I dialed it back and = everything smoothed out. This is different. It doesn=92t really = backfire. It is a thump and it jerks the engine and plane. You can = hear and feel it. It seems to be a single thump and it has varying = degrees of violence. Some are just a little miss and some are so bad it = shakes everything. These are less frequent, but they are bad enough = that I don=92t think they are good for the PSRU, prop, or engine mount. That is why I have been bugging Tracy about the change for the EC-2. = I have my fingers crossed that this will fix it. :>) Bill B ------=_NextPart_000_0079_01CDEE5F.95EACFB0 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Hi Bill,
Another thing you might = check.
 
I had a similer problem to yours in my = fuel=20 injected Ford V6 BD-4 with Tracys EC2 and EM2. For about a year I was = plagued,=20 while flying, with a brief miss with a jerk from the engine at = random=20 times even hours apart. It would mostly happen at higher RPM's then = cruise,=20 but sometimes at cruise. I checked everything I could think = of.
 
My problem was that one or two = of my ignition=20 wires (MSD's 8.5mm Super = Conductor wire set,=20 brand new no less) had some intermittent connectors. I discovered this = by=20 checking the resistance of each wire while working the connectors a = little bit=20 to see if the resistance fluctuated excessively or even became an open = circuit.=20 Once I fixed these intermittents my problem was solved. =
 
I know how unsettleing this can be = while flying. I=20 hope you find your problem.
 
Robert Bollinger
 
----- Original Message -----
From:=20 Ernest=20 Christley
Sent: Wednesday, January 09, = 2013 8:38=20 AM
Subject: [FlyRotary] Re: = Aeroquip hose=20 changed to hiccup

A problem that mimics a poorly wired VR sensor, but 
-only happens occasionally, 
-with various levels of "response"
-and is getting worse.

Bill, if you haven't done so already, I would suggest changing = the wiring=20 to the VR sensor completely.  It sounds to me like a textbook = example of=20 the worst sort of electronic malfunction you can have=85an = intermittent open.=20  You'll never find it under normal test conditions, and it will = manifest=20 at the most inopportune times.  The only way to completely rule = it out as=20 a failure scenario is to completely replace the circuit path.



On Jan 8, 2013, at 11:42 PM, Bill Bradburry wrote:

No, I = have the 2.85=20 gearbox.  I have the MT electric prop, so I fly WOT and use the = prop to=20 govern the engine speed. 

I have = changed the=20 plugs with no effect.  The mixture is fine when this is=20 happening.  Fuel pressure also.  I had an incident once on = take=20 off like you describe where the plane was backfiring like crazy just = after I=20 lifted off.  I had the mixture too rich.  I dialed it back = and=20 everything smoothed out.  This is different.  It doesn=92t = really=20 backfire.  It is a thump and it jerks the engine and = plane.  You=20 can hear and feel it.  It seems to be a single thump and it has = varying=20 degrees of violence.  Some are just a little miss and some are = so bad=20 it shakes everything.  These are less frequent, but they are = bad enough=20 that I don=92t think they are good for the PSRU, prop, or engine=20 mount.

That is = why I have=20 been bugging Tracy about the change for the = EC-2. =20 I have my fingers crossed that this will fix it. =20 :>)

Bill=20 B

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