X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost02.isp.att.net ([204.127.217.102] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTP id 6003411 for flyrotary@lancaironline.net; Wed, 09 Jan 2013 15:00:03 -0500 Received-SPF: none receiver=logan.com; client-ip=204.127.217.102; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-98-85-145-180.mco.bellsouth.net[98.85.145.180]) by isp.att.net (frfwmhc02) with SMTP id <20130109195929H02000ag8de>; Wed, 9 Jan 2013 19:59:29 +0000 X-Originating-IP: [98.85.145.180] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: Aeroquip hose changed to hiccup Date: Wed, 9 Jan 2013 14:59:30 -0500 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0057_01CDEE79.EDF21050" X-Mailer: Microsoft Office Outlook 11 Thread-Index: Ac3ukfYXSnTF5BAHSVKVlGJqeG2regADzsIg X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18463 This is a multi-part message in MIME format. ------=_NextPart_000_0057_01CDEE79.EDF21050 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Robert, I will check that the next time I am at the airport. I am using the stock Renesis wires and igniters. You just wiggled the wires with the VOM connected?? Bill _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Rob Sent: Wednesday, January 09, 2013 12:51 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Aeroquip hose changed to hiccup 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. I know how unsettleing this can be while flying. I hope you find your problem. Robert Bollinger ----- Original Message ----- From: Ernest Christley To: Rotary motors in aircraft 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 -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 to the VR sensor completely. It sounds to me like a textbook example of the worst sort of electronic malfunction you can have.an 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. 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't 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't 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_0057_01CDEE79.EDF21050 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Robert,

=

I will check that the next time I = am at the airport.  I am using the stock Renesis wires and = igniters.  You just wiggled the wires with the VOM connected??

 

Bill

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Rob
Sent: Wednesday, January = 09, 2013 12:51 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Aeroquip hose changed to hiccup

 

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.

 

I know how unsettleing this can be while flying. I = hope you find your problem.

 

Robert Bollinger

 

----- Original Message ----- =

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 

-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 to the VR sensor completely.  It sounds to me like a = textbook example of the worst sort of electronic malfunction you can = have…an 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. 

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’t 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’t 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_0057_01CDEE79.EDF21050--