Return-Path: Received: from [65.54.169.94] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3138771 for flyrotary@lancaironline.net; Wed, 31 Mar 2004 12:21:58 -0500 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 31 Mar 2004 09:21:57 -0800 Received: from 64.159.105.160 by BAY3-DAV64.phx.gbl with DAV; Wed, 31 Mar 2004 17:21:57 +0000 X-Originating-IP: [64.159.105.160] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] One more question : EC2 operation Date: Wed, 31 Mar 2004 12:21:55 -0500 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0003_01C4171A.C123BD70" Message-ID: X-OriginalArrivalTime: 31 Mar 2004 17:21:57.0998 (UTC) FILETIME=[ABC0F0E0:01C41744] ------=_NextPart_001_0003_01C4171A.C123BD70 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message ----- From: Ed Anderson Sent: Wednesday, March 31, 2004 7:57 AM To: Rotary motors in aircraft Subject: [FlyRotary] One more question (Tracy, see comments inred) Good explanation and I agree with everything except the part about RPM no= t being used by the EC2. Engine speed is a primary input to the system, = hence the term "speed - density system". =20 Ok, if I understand you correctly, Tracy, then RPM IS a computational v= ariable in determining fuel injector pulse duration and not just the "fre= quency of injection" factor. Is RPM an adjustment for "Volumetric Effici= ency" at different rpms or used for a different purpose?? Ed Guess a little more detail is needed to explain this. The EC2 re-compute= s the injection requirements in real time. Just before the intake cycle = starts, it computes the required fuel for this individual intake cycle. = You can't get any more closely tied to RPM than this. The volumetric efficiency is very much affected by the design of the inta= ke system. Since there are no two alike out there (at this time), it is = not possible to take VE into consideration as a function of RPM. Detroit= has it much easier in this respect because they can control every detail= of the engine. Tracy ------=_NextPart_001_0003_01C4171A.C123BD70 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
 
----- Original Message -----
From: Ed Anderson
Sent: Wednesday, March 31, 2004 7:57 AM
To: Rotary motors in aircraft=
Subject: [FlyRotary] One mo= re question (Tracy, see comments inred)
 
 
 

Goo= d explanation and I agree with everything except the part about RPM not b= eing used by the EC2.  Engine speed is a primary input to the system= , hence the term "speed - density system".  
 
= Ok, if I understand you correctly, Tracy,  then RPM IS a  = computational variable in determining fuel injector pulse duration and no= t just the "frequency of injection" factor.  Is RPM an adjustme= nt for "Volumetric Efficiency" at different rpms or used for a different = purpose??
 
<= FONT face=3DArial color=3D#0000ff>Ed
 
Guess a little more detail is n= eeded to explain this.  The EC2 re-computes the injection requiremen= ts in real time.  Just before the intake cycle starts, it compu= tes the required fuel for this individual intake cycle.  You ca= n't get any more closely tied to RPM than this.
 
<= DIV>The volumetric efficiency is very much affected by the= design of the intake system.  Since there are no two alike out ther= e (at this time), it is not possible to take VE into consideration a= s a function of RPM.  Detroit has it much easier in this respect bec= ause they can control every detail of the engine.
 
=
Tracy
 
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