X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao12.cox.net ([68.230.241.27] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1063794 for flyrotary@lancaironline.net; Mon, 10 Apr 2006 01:56:07 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.27; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao12.cox.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20060410055518.XBOJ17437.fed1rmmtao12.cox.net@BigAl> for ; Mon, 10 Apr 2006 01:55:18 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: FI mystery Date: Sun, 9 Apr 2006 22:55:22 -0700 Message-ID: <000001c65c63$5b682f30$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C65C28.AF0BC830" 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_01C65C28.AF0BC830 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Not too rich, much too lean - I have to leave the cold start switch on = to keep it running; IIRC the cold start switch doubles the pulse width. =20 1. It sounds as if the EC2 may not be sensing manifold pressure = properly. At low rpm (2000), it sounds as if it is too rich and you are having to = lean it and at higher rpm you have to enrichen the mixture manually to keep = the engine running. As you know, Normally the EC2 should do this by sensing manifold pressure and adjusting injector timing - possibly it is not = doing that. =20 2. These are symptoms very like the ones I had when I left the manifold hoses off the EC2 sensors (actually, I had plugged them in through the = holes in the case but had reversed the board position in the case - so they = were actually stuck under components on the board) =20 Ed =20 Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com =20 =20 ----- Original Message -----=20 From: Al Gietzen =20 To: Rotary motors in aircraft=20 Sent: Sunday, April 09, 2006 11:27 AM Subject: [FlyRotary] FI mystery =20 I put about 4 - 5 hours of time on my engine installation months ago, = and had everything pretty much "dialed in" for proper running from 1000 rpm = up to max static rpm (~5200). Then it sat with no running for about 6 = months while I did upholstery, paint and other stuff in my life. I've moved = the plane to the airport, and got it all assembled. Yesterday rolled it out = for an engine run-up. =20 Since the beginning it had always fired off after a few strokes, and I'd turn off the cold start switch seconds after it was running. This time I = had difficulty in getting it started. Once I got it running, it would quit immediately when the cold start switch was turned off. Leaving the cold start "on" it runs fine above about 2000 rpm with the mixture turned = toward lean to about 9:00 o'clock. Reducing rpm lower it wants to die. As I increase rpm above 2000 I need to rotate mixture knob significantly = toward to richer to keep things smooth. =20 Fuel pressure, MAP, ignition, etc. all are normal. When I get the = mixture knob adjusted it is smooth, so injectors are working on all three = rotors. I didn't take it above the staging point so it is running on one set of injectors. Haven't had a chance yet to look at the mixture map on the = EM2, and won't get back to the airport until Monday. =20 I'm a bit baffled on what could have changed since last operation and = what to check. Anybody have any similar experience? Ideas? =20 Al ------=_NextPart_000_0001_01C65C28.AF0BC830 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Not too rich, much too lean = – I have to leave the cold start switch on to keep it running; IIRC the cold = start switch doubles the pulse width.

 

1.  It sounds as if = the EC2 may not be sensing manifold pressure properly.  At low rpm (2000), it = sounds as if it is too rich and you are having to lean it and at higher rpm =  you have to enrichen the mixture manually to keep the engine = running. As you know,  Normally the EC2 should do this by sensing manifold pressure = and adjusting injector timing - possibly it is not doing = that.

 

2.  These are symptoms = very like the ones I had when I left the manifold hoses off the EC2 sensors (actually, I had plugged them in through the holes in the case but had = reversed the board position in the case - so they were actually stuck under = components on the board)

 

Ed

 

Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com

 

 

=

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

From: Al = Gietzen

Sent: Sunday, April 09, 2006 11:27 AM

Subject: [FlyRotary] FI mystery

 

I put about 4 - 5 hours = of time on my engine installation months ago, and had everything pretty much = “dialed in” for proper running from 1000 rpm up to max static rpm = (~5200).  Then it sat with no running for about 6 months while I did upholstery, = paint and other stuff in my life.  I’ve moved the plane to the = airport, and got it all assembled.  Yesterday rolled it out for an engine = run-up.

 

Since the beginning it = had always fired off after a few strokes, and I’d turn off the cold start = switch seconds after it was running. This time I had difficulty in getting it started.  Once I got it running, it would quit immediately when the = cold start switch was turned off.  Leaving the cold start = “on” it runs fine above about 2000 rpm with the mixture turned toward lean to = about 9:00 o’clock.  Reducing rpm lower it wants to die. As I = increase rpm above 2000 I need to rotate mixture knob significantly toward to richer = to keep things smooth.

 

Fuel pressure, MAP, = ignition, etc. all are normal.  When I get the mixture knob adjusted it is smooth, = so injectors are working on all three rotors.  I didn’t take it = above the staging point so it is running on one set of injectors.  = Haven’t had a chance yet to look at the mixture map on the EM2, and won’t = get back to the airport until Monday.

 

I’m a bit baffled = on what could have changed since last operation and what to check.  Anybody = have any similar experience?  Ideas?

 

Al

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