X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 25 Aug 2009 15:49:24 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-curtail.atl.sa.earthlink.net ([209.86.89.64] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3824199 for lml@lancaironline.net; Tue, 25 Aug 2009 14:51:54 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.64; envelope-from=douglasbrunner@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=UyA/E2wYFoBBAKhRGJZHvrtA8bk++nTevHXt5UbAc7eUCqfyLIodIbJCraLGiwb6; h=Received:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-ELNK-Trace:X-Originating-IP; Received: from [74.93.196.178] (helo=DougsLaptop) by elasmtp-curtail.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1Mg16z-0001YO-GN; Tue, 25 Aug 2009 14:51:17 -0400 X-Original-Message-ID: <72BFD8DE20C94E77B94EEBEA5BBA2DD2@DougsLaptop> From: "Douglas Brunner" X-Original-To: "Lancair Mailing List" References: In-Reply-To: Subject: Re: [LML] Re: Plenum pressure and Injector performance LOP X-Original-Date: Tue, 25 Aug 2009 14:51:14 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00EF_01CA2593.7E2E6370" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6001.18000 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 X-ELNK-Trace: ad85a799c4f5de37c2eb1477c196d22294f5150ab1c16ac0d64a9adbca5b3d7c39df30e03d68395993fe1c6a7e6d91c1350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 74.93.196.178 This is a multi-part message in MIME format. ------=_NextPart_000_00EF_01CA2593.7E2E6370 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable This topic is very well covered by the GAMI boys in their seminars. As you approach peak from the rich side (they actually recommend = approaching peak from the lean side but that is another story) the CHTs = will peak about 50 ROP (rich of peak) and EGTs will peak at peak (by = definition) "how do you know you didn't go through peak already?" a.. If you are on the "rich side" as you lean your engine EGTs go UP b.. If you are on the "lean side" as you lean your engine EGTs go DOWN "ignition timing could also be a factor" Ignitition timing is one of the factors that determines how and when the = mixture burns, however peak intra-cylinder pressure is also determined = by the mixture. Since 50 ROP mixtures burn the fastest but richer or = leaner mixture burn slower, the effective timing is the most advanced at = 50 ROP even in a (dual mag) fixed timing engine. Therefore since = mixture affects peak intracylinder pressure, you don't know your = effective timing unless you take into account where you timing is set = and what your mixture is. D. Brunner P.S. Yes, I have drunk the KoolAid ----- Original Message -----=20 From: Colyn Case at earthlink=20 To: lml@lancaironline.net=20 Sent: Tuesday, August 25, 2009 6:17 AM Subject: [LML] Re: Plenum pressure and Injector performance LOP what do the egt's and cht's do as you approach peak from the rich = side? how doyou know you didn't go through peak already? ignition timing could also be a factor. Colyn ------=_NextPart_000_00EF_01CA2593.7E2E6370 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
This topic is very well covered by the GAMI boys in their = seminars.
 
As you approach peak from the rich side  (they actually = recommend=20 approaching peak from the lean side but that is another story) the CHTs = will=20 peak about 50 ROP (rich of peak) and EGTs will peak at peak (by=20 definition)
 
"how do you know you didn't go through peak=20 already?"
  • If you are on the "rich side" as you lean your engine EGTs go = UP
  • If you are on the "lean side" as you lean your engine EGTs go = DOWN
"ignition timing could also be a factor"
 
Ignitition timing is one of the factors = that=20 determines how and when the mixture burns, however peak intra-cylinder = pressure=20 is also determined by the mixture.  Since 50 ROP mixtures burn the = fastest=20 but richer or leaner mixture burn slower, the = effective=20 timing is the most advanced at 50 ROP even in a (dual mag) fixed = timing=20 engine.  Therefore since mixture affects peak intracylinder=20 pressure, you don't know your effective timing unless you take = into=20 account where you timing is set and what your = mixture=20 is.
 
D. Brunner
 
P.S. Yes, I have drunk the KoolAid
----- Original Message -----
From:=20 Colyn=20 Case at earthlink
Sent: Tuesday, August 25, 2009 = 6:17=20 AM
Subject: [LML] Re: Plenum = pressure and=20 Injector performance LOP

what do the egt's and cht's do as you approach peak from the rich = side?
how doyou know you didn't go through peak already?
 
ignition timing could also be a factor.
 
Colyn
 
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