Return-Path: Received: from fed1rmmtao04.cox.net ([68.230.241.35] verified) by logan.com (CommuniGate Pro SMTP 4.2.3) with ESMTP id 430081 for flyrotary@lancaironline.net; Thu, 23 Sep 2004 23:34:57 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.35; envelope-from=ALVentures@cox.net Received: from BigAl ([68.107.116.221]) by fed1rmmtao04.cox.net (InterMail vM.6.01.03.04 201-2131-111-106-20040729) with ESMTP id <20040924033425.ESCV11627.fed1rmmtao04.cox.net@BigAl> for ; Thu, 23 Sep 2004 23:34:25 -0400 From: "Al Gietzen" To: "Rotary motors in aircraft" Subject: EC2 problem Date: Thu, 23 Sep 2004 20:34:32 -0700 Message-ID: <000001c4a1e7$67f567f0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4A1AC.BB968FF0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C4A1AC.BB968FF0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Maybe I can get some help on this one.=20 =20 Engine running quite smoothly at 2000 rpm, warmed up. The mixture = setting about 4:00 - 5:00 o'clock position, which has seemed odd to me that it = need be way over there using the default MAP table, but that was where it ran = the smoothest. Manifold pressure on EM2 reading about 10" (This seems a = bit low, but that's another matter); in any case, below the injector staging point. =20 Switching off the secondary injectors results in very rough running; = much too rich, turning mixture back to about 11:00 gets it smoothed out.=20 =20 Turning off the primary injector switch results in engine faltering = badly, almost as though it's running on only one of 3 rotors, changing mixture doesn't seem to help, engine will die on 4-5 seconds. At restart with = both sets on, the mixture has to be set back to lean for a bit for the engine = to clear, and then runs fine again at the 4-5 o'clock position. Suggests = that turning primary off makes mixture way too rich, or whatever. =20 Double checked all connections, switches, staging relay - all seems = fine. This is the same wiring harness that worked fine on the dyno, so with = all the connections where they belong one would expect it to work again. = This is the first time since on the plane that I've experimented with = disabling injectors. I did this briefly the first time I started, when the engine = was cold, and had noted that it got rough turning off the secondary, and = died turning off the primary, but didn't address it further at that time, and forgot about it since (or I've been in denial about it). =20 I can't seem to come up with a scenario that fits this picture. =20 Switching to controller B resulted in similar behavior, but rougher = running, likely because it takes MAP reading from one runner only, and I have no pulse filter on that connection. =20 Somewhere in all that I noted that even when running smoothly, the = mixture bar graph on EM2 was not steady; going up and down roughly around the midpoint. =20 The worst part is that the rich running put a light coating of black = soot on my beautiful white prop:-). (Pusher, exhaust goes through prop). =20 Al ------=_NextPart_000_0001_01C4A1AC.BB968FF0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Maybe I can get some help on this one. =

Engine running quite smoothly at 2000 rpm, warmed = up. The mixture setting about 4:00 – 5:00 = o’clock position, which has seemed odd to me that it need be way over there = using the default MAP table, but that was where it ran the smoothest. = Manifold pressure on EM2 reading about 10” (This seems a bit low, but = that’s another matter); in any case, below the injector staging = point.

Switching off the secondary injectors results in = very rough running; much too rich, turning mixture back to about = 11:00 gets it smoothed out.

Turning off the primary injector switch results in = engine faltering badly, almost as though it’s running on only one of 3 = rotors, changing mixture doesn’t seem to help, engine will die on 4-5 = seconds. At restart with both sets on, the mixture has to be set back to lean for = a bit for the engine to clear, and then runs fine again at the 4-5 = o’clock position. Suggests that turning primary off makes mixture way too = rich, or whatever.

Double checked all connections, switches, staging = relay – all seems fine. This is the same wiring harness that worked fine = on the dyno, so with all the connections where they belong one would expect it to = work again. This is the first time since on the plane that I’ve experimented with disabling injectors. I did this briefly the = first time I started, when the engine was cold, and had noted that it got rough = turning off the secondary, and died turning off the primary, but didn’t = address it further at that time, and forgot about it since (or I’ve been = in denial about it).

I can’t seem to come up with a scenario that = fits this picture.

Switching to controller B resulted in similar = behavior, but rougher running, likely because it takes MAP reading from one runner = only, and I have no pulse filter on that connection.

Somewhere in all that I noted that even when = running smoothly, the mixture bar graph on EM2 was not steady; going up and down roughly around the midpoint.

The worst part is that the rich running put a light coating of black soot on my beautiful white propJ. (Pusher, exhaust goes through prop).

Al

------=_NextPart_000_0001_01C4A1AC.BB968FF0--