X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [129.116.87.142] (HELO MAIL01.austin.utexas.edu) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1065138 for flyrotary@lancaironline.net; Tue, 11 Apr 2006 08:22:37 -0400 Received-SPF: none receiver=logan.com; client-ip=129.116.87.142; envelope-from=mark.steitle@austin.utexas.edu X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C65D62.83EBDAC6" Subject: RE: [FlyRotary] Re: FI mystery Date: Tue, 11 Apr 2006 07:21:52 -0500 Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E043AE096@MAIL01.austin.utexas.edu> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: FI mystery thread-index: AcZdGiOb4sqiyfzJQbKaSRuG+eFYnAASB7zg From: "Mark R Steitle" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C65D62.83EBDAC6 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Al, Just guessing here, but have you checked that the EC-2 has a good ground, and that the injector grounds are good and solid? =20 =20 Mark S. =20 ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen Sent: Monday, April 10, 2006 10:43 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: FI mystery =20 =20 Since we are looking for something obscure here I would check the voltage to the fuel injectors. Low voltage would make for a lean mixture. Other items are: 2. vacuum line disconnected 3. air leak 4. fuel pressure =20 Haven't checked the voltage to the injectors yet; so I can do that. =20 Checked - No vacuum line leaks; no lines out of place. Leak in MAP line would give a higher MAP reading and too rich a mixture. =20 Checked - No air leaks - would take a major leak downstream from the injectors to give these symptoms. =20 Fuel pressure is normal. =20 Did you try both controllers?=20 =20 Tried both controllers - same behavior. Looked at the mixture correction table on the EM-2; things look normal. The mixture "map" would have to be WAY off to require 'cold start' switch on. =20 The only thing I noted as abnormal was that the EGT on rotor one was not stable; seemed to be 'hunting' around the values of the other two. Since the engine was running smooth and steady, I attributed this to something related to the TC, like poor connection, TC going bad, etc. I can find no connection between this and a way to lean mixture w/o cold start switch on. =20 Al (still baffled) ------_=_NextPart_001_01C65D62.83EBDAC6 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Al,

Just guessing here, but have you = checked that the EC-2 has a good ground, and that the injector grounds are good = and solid? 

 

Mark = S.

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen
Sent: Monday, April 10, = 2006 10:43 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = FI mystery

 

 

Since we are looking for something obscure = here I would check the voltage to the fuel injectors.  Low voltage would = make for a lean mixture.  Other items are:

2.  vacuum line = disconnected

3.  air = leak

4.  fuel = pressure

 

=

Haven’t checked the voltage = to the injectors yet; so I can do that.

 

Checked - No vacuum line leaks; = no lines out of place. Leak in MAP line would give a higher MAP reading and too = rich a mixture.

 

Checked - No air leaks – = would take a major leak = downstream from the injectors to give these symptoms.

 

Fuel pressure is = normal.

 

Did you try both = controllers? 

 

Tried both controllers – same behavior.  Looked at the mixture correction table on the EM-2; = things look normal.  The mixture “map” would have to be WAY off to = require ‘cold start’ switch on.

 

The only thing I noted as = abnormal was that the EGT on rotor one was not stable; seemed to be = ‘hunting’ around the values of the other two.  Since the engine was running = smooth and steady, I attributed this to something related to the TC, like poor connection, TC going bad, etc.  I can find no connection between = this and a way to lean mixture w/o cold start switch = on.

 

Al (still = baffled)

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