X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1063436 for flyrotary@lancaironline.net; Sun, 09 Apr 2006 20:22:19 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-025-165.carolina.res.rr.com [24.74.25.165]) by ms-smtp-02-eri0.southeast.rr.com (8.13.4/8.13.4) with SMTP id k3A0LWPu020956 for ; Sun, 9 Apr 2006 20:21:34 -0400 (EDT) Message-ID: <00fd01c65c34$c4d27720$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] FI mystery Date: Sun, 9 Apr 2006 20:21:53 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00FA_01C65C13.3D7B90C0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_00FA_01C65C13.3D7B90C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The old two steps forward, one step backward problem. Its frustrating = for sure. 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 -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 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 ------=_NextPart_000_00FA_01C65C13.3D7B90C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
The old two steps forward, one step backward=20 problem.  Its frustrating for sure.
 
1.  It sounds as if the EC2 may not be = sensing=20 manifold pressure properly.  At low rpm (2000), it sounds as if it = is too=20 rich and you are having to lean it and at higher rpm  you have to = enrichen=20 the mixture manually to keep the engine running. As you know,=20  Normally the EC2 should do this by sensing manifold pressure and = adjusting=20 injector timing - possibly it is not doing that.
 
2.  These are symptoms very like the ones I = had when=20 I left the manifold hoses off the EC2 sensors (actually, I had plugged = them in=20 through the holes in the case but had reversed the board position in the = case -=20 so they were actually stuck under components on the board)
 
Ed
 
Ed Anderson
Rv-6A N494BW Rotary = Powered
Matthews,=20 NC
eanderson@carolina.rr.com
 
 
----- Original Message -----
From:=20 Al = Gietzen=20
Sent: Sunday, April 09, 2006 = 11:27=20 AM
Subject: [FlyRotary] FI = mystery

I put about 4 - 5 = hours of time=20 on my engine installation months ago, and had everything pretty much = =93dialed=20 in=94 for proper running from 1000 rpm up to max static rpm = (~5200).  Then=20 it sat with no running for about 6 months while I did upholstery, = paint and=20 other stuff in my life.  I=92ve moved the plane to the airport, = and got it=20 all assembled.  Yesterday rolled it out for an engine=20 run-up.

 

Since the beginning it = had=20 always fired off after a few strokes, and I=92d turn off the cold = start switch=20 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=20 start switch was turned off.  Leaving the cold start =93on=94 it = runs fine=20 above about 2000 rpm with the mixture turned toward lean to about=20 9:00 = o=92clock.  Reducing rpm = lower it=20 wants to die. As I increase rpm above 2000 I need to rotate mixture = knob=20 significantly toward to richer to keep things = smooth.

 

Fuel pressure, MAP, = ignition,=20 etc. all are normal.  When I get the mixture knob adjusted it is = smooth,=20 so injectors are working on all three rotors.  I didn=92t take it = above the=20 staging point so it is running on one set of injectors.  = Haven=92t had a=20 chance yet to look at the mixture map on the EM2, and won=92t get back = to the=20 airport until Monday.

 

I=92m a bit baffled on = what could=20 have changed since last operation and what to check.  Anybody = have any=20 similar experience?  Ideas?

 

Al

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