X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 949963 for flyrotary@lancaironline.net; Thu, 19 May 2005 13:01:42 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-065-188-083-049.carolina.res.rr.com [65.188.83.49]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j4JH0rL5020894 for ; Thu, 19 May 2005 13:00:54 -0400 (EDT) Message-ID: <002301c55c94$5572cfb0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: More MAP measurement questions Date: Thu, 19 May 2005 13:01:00 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0020_01C55C72.CE319430" 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_0020_01C55C72.CE319430 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageAl is right, the EC2 adjusts the amount of ignition time retard = based on your initial static timing setting and the rpm and can be = further adjusted by whatever adjustment you may have made in mode 7 of = the EC2. I don 't know what relationship between rpm and timing or the = algorithm Tracy uses, but I would assume it provides more advance ( = really less retard) the higher the rpm - but just a guess on my part. Ed ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Thursday, May 19, 2005 12:12 PM Subject: [FlyRotary] Re: More MAP measurement questions Al,Rusty and All, Excuse my ignorance here, I have absolutely no knowledge about how = ECU's work. I've heard people say that it reads MAP settings - so what = is a MAP, and if it's different because the pressure is different at = different places in the inlet, how can the computer calculate the inlet = charge and timing. I'm confused! George ( down under) It is my understanding that the EC2 does not adjust timing but the = injectors pulse width only. Is this correct? Wendell It also adjusts the ignition timing. I don't know what the = formula is, but I'm sure it uses RPM. Al ------=_NextPart_000_0020_01C55C72.CE319430 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Al is right, the EC2 adjusts the amount of = ignition time=20 retard based on your initial static timing setting and the rpm and = can be=20 further adjusted by whatever adjustment you may have made in mode 7 of = the=20 EC2.  I don 't know what relationship between rpm and timing or the = algorithm Tracy uses, but I would assume it provides more advance ( = really less=20 retard) the higher the rpm - but just a guess on my part.
 
Ed
 
 
----- Original Message -----
From:=20 Al = Gietzen=20
Sent: Thursday, May 19, 2005 = 12:12=20 PM
Subject: [FlyRotary] Re: More = MAP=20 measurement questions

 

Al,Rusty and=20 All,

Excuse my ignorance = here, I have=20 absolutely no knowledge about how ECU's work. I've heard people say = that it=20 reads MAP settings - so what is a MAP, and if it's different because = the=20 pressure is different at different places in the inlet, how can the = computer=20 calculate the inlet charge and timing.

I'm=20 confused!

George ( down=20 under)

It is my=20 understanding that the EC2 does not adjust timing but the = injectors pulse=20 width only. Is this correct?

Wendell

 

It = also adjusts=20 the ignition timing.  I don=92t know what the formula is, but = I=92m sure=20 it uses RPM.

 

Al

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