X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao10.cox.net ([68.230.241.29] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1064876 for flyrotary@lancaironline.net; Mon, 10 Apr 2006 23:43:43 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.29; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao10.cox.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20060411034258.WTJH20441.fed1rmmtao10.cox.net@BigAl> for ; Mon, 10 Apr 2006 23:42:58 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: FI mystery Date: Mon, 10 Apr 2006 20:43:04 -0700 Message-ID: <000001c65d1a$0a18ad00$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C65CDF.5DB9D500" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C65CDF.5DB9D500 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =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_000_0001_01C65CDF.5DB9D500 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

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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