Return-Path: Received: from fed1rmmtao08.cox.net ([68.230.241.31] verified) by logan.com (CommuniGate Pro SMTP 4.2.4) with ESMTP id 450956 for flyrotary@lancaironline.net; Sun, 03 Oct 2004 01:38:48 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.31; envelope-from=ALVentures@cox.net Received: from BigAl ([68.107.116.221]) by fed1rmmtao08.cox.net (InterMail vM.6.01.03.04 201-2131-111-106-20040729) with ESMTP id <20041003053818.BUVC4089.fed1rmmtao08.cox.net@BigAl> for ; Sun, 3 Oct 2004 01:38:18 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: MAP pulses (20B) Date: Sat, 2 Oct 2004 22:38:30 -0700 Message-ID: <000001c4a90b$37014120$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4A8D0.8AA26920" 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_01C4A8D0.8AA26920 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit What surprised me was that with the engine running at 2000, the pointer was swinging very rapidly over a range of over a pretty wide range; from about 27 to 37 psi. It is an undamped bourdon-tube gauge, responding to a lot of pulsing. I had no pulse filtering between the manifold and the fuel pressure regulator. Was the engine running smoothly at 2000? Did all the improvements you made actually allow you to run a smooth idle down around 1000 or so? Yes it was; so I can't say the pulsing in the fuel pressure was interfering with the operation at lower rpm; it was, at the least, indicative of uneven MAP and likely very hard on the FP regulator. I haven't run lower than about 1500 yet since that is where the idle stop is set; and I am pursuing other issues. But it does now run smoothly at that speed - secondary injectors only. The other issues are that the "staging" is not working; it does not run completely smoothly with both sets on; less smooth on primary only; and very smooth with secondary only (primary turned off). If you can figure those things out for me, you win the cigar. Still waiting on a new chip for the EM2, but the next time I run I'll slow it down further. Al ------=_NextPart_000_0001_01C4A8D0.8AA26920 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

What surprised me was that with the engine running at 2000, the pointer was = swinging very rapidly over a range of over a pretty wide range; from about 27 to = 37 psi.  It is an undamped bourdon-tube gauge, responding to a lot of pulsing.  I had no pulse filtering between the manifold and the = fuel pressure regulator.

Was the engine = running smoothly at 2000?  Did all the improvements you made actually allow = you to run a smooth idle down around 1000 or so? 

Yes it was; so I can’t say the = pulsing in the fuel pressure was interfering with the operation at lower rpm; it = was, at the least, indicative of uneven MAP and likely very hard on the FP regulator.  I haven’t run lower than about 1500 yet since = that is where the idle stop is set; and I am pursuing other issues. But it does = now run smoothly at that speed – secondary injectors only.  The other = issues are that the “staging” is not working; it does not run = completely smoothly with both sets on; less smooth on primary only; and very smooth with = secondary only (primary turned off).  If you can figure those things out for = me, you win the cigar.  Still waiting on a new chip for the EM2, but the = next time I run I’ll slow it down further.

Al

------=_NextPart_000_0001_01C4A8D0.8AA26920--