X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 64 [XX] (100%) BODY: contains text similar to "low payment" Return-Path: Received: from ms-smtp-03.southeast.rr.com ([24.25.9.102] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTP id 1914194 for flyrotary@lancaironline.net; Sat, 10 Mar 2007 23:35:19 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-03.southeast.rr.com (8.13.6/8.13.6) with SMTP id l2B4YSOY015249 for ; Sat, 10 Mar 2007 23:34:29 -0500 (EST) Message-ID: <000901c76396$915ec5a0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: The truth??? / Injector flow rate mystery solved Date: Sat, 10 Mar 2007 23:34:33 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C7636C.A83A0160" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C7636C.A83A0160 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageI follow that, Steve. That sounds like a possible reason why my idle is so "sloppy" below 2000 = rpm. It acts like its overly rich but when I attempt to reduce the fuel = ratio by reducing the mixture control the engine dies. So when I reduce = the mixture and it drops the pulse duration below 2 milliseconds the = engine dies - but 2 milliseconds provides too much fuel at idle. =20 I wonder if Tracy now flying with a Renesis engine does not have this = problem because I believe the primary injectors on it are around 250 = cc/min compared to my 460 cc/min. So nearly 1/2 the fuel flow per = millisecond than my injectors. So two milliseconds on the 250 cc/min = injectors may be OK at idle but 2 milliseconds on 460 cc/min is just too = much. Thanks for pointing that out Steve. All is becoming much clearer. Ed ----- Original Message -----=20 From: Steven Boese=20 To: Rotary motors in aircraft=20 Sent: Saturday, March 10, 2007 10:44 PM Subject: [FlyRotary] Re: The truth??? / Injector flow rate mystery = solved Ed and George, =20 In my plane, at least, injector open times need to be less than 2 ms = at idle and just above the staging point. This is not possible with a = minimum open time of 2 ms due to the delay on closing. You can program = the EC2 for less than 2 ms but the hardware is unable to do this. That = means that the problem can't be fixed with software or programming = different values in the map table. A shorter close delay time is = required unless you lower the flow rate of the injectors by changing the = injector itself or lower the fuel pressure. The injector open time is = at least 2 ms or it doesn't open at all. =20 Steve Boese ------=_NextPart_000_0006_01C7636C.A83A0160 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
I follow that, Steve.
 
That sounds like a possible reason why my idle = is so=20 "sloppy" below 2000 rpm.  It acts like its overly rich but when I = attempt=20 to reduce the fuel ratio by reducing the mixture control the engine=20 dies. So when I reduce the mixture and it drops the pulse duration = below 2=20 milliseconds the engine dies - but 2 milliseconds provides too much fuel = at=20 idle. 
 
I wonder if Tracy now flying with a Renesis = engine does=20 not have this problem because I believe the primary injectors on it are = around=20 250 cc/min compared to my 460 cc/min.  So nearly 1/2 the fuel flow = per=20 millisecond than my injectors.  So two milliseconds on the 250 = cc/min=20 injectors may be OK at idle but 2 milliseconds on 460 cc/min is just too = much.
 
Thanks for pointing that out Steve.  All is = becoming=20 much clearer.
 
Ed
 
 
----- Original Message -----
From:=20 Steven = Boese
Sent: Saturday, March 10, 2007 = 10:44=20 PM
Subject: [FlyRotary] Re: The = truth??? /=20 Injector flow rate mystery solved

Ed and=20 George,

 

In my = plane, at=20 least, injector open times need to be less than 2 ms at idle and just = above=20 the staging point.  This = is not=20 possible with a minimum open time of 2 ms due to the delay on = closing.  You can program the EC2 for = less than=20 2 ms but the hardware is unable to do this.  That means that the problem = can=92t be=20 fixed with software or programming different values in the map = table.  A shorter close delay time = is required=20 unless you lower the flow rate of the injectors by changing the = injector=20 itself or lower the fuel pressure. =20 The injector open time is at least 2 ms or it doesn=92t open at = all.

 

Steve Boese

------=_NextPart_000_0006_01C7636C.A83A0160--