X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 22 Oct 2013 11:14:43 -0400 Message-ID: X-Original-Return-Path: Received: from mail.carneal.com ([174.129.224.69] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTPS id 6550477 for lml@lancaironline.net; Tue, 22 Oct 2013 10:11:35 -0400 Received-SPF: none receiver=logan.com; client-ip=174.129.224.69; envelope-from=walter@advancedpilot.com Received: (qmail 18083 invoked from network); 22 Oct 2013 14:11:11 -0000 Received: from 174-24-113-57.clsp.qwest.net (HELO ?192.168.182.27?) (walter@advancedpilot.com@174.24.113.57) by mail.carneal.com with ESMTPA; 22 Oct 2013 14:11:11 -0000 From: Walter Atkinson Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: multipart/alternative; boundary="Apple-Mail=_9213E0BF-CAE4-4DAA-8B34-79F869935882" Subject: Re: [LML] Hot TITs on X country leg. LIVP X-Original-Date: Tue, 22 Oct 2013 08:11:00 -0600 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <022C9FF4-A37A-4541-B069-31781DD156D9@advancedpilot.com> X-Mailer: Apple Mail (2.1283) --Apple-Mail=_9213E0BF-CAE4-4DAA-8B34-79F869935882 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 Gary: I was going to guess that. Honest, I was :-). But just one correction: = The high exhaust temperature with one ignition off isn't due to = "incomplete fuel burn." The burn is virtually complete whether running = on one spark plug or two. But the burn RATE is much different. With = two plugs there are two flame fronts and the burn completes sooner. =20 True The slower burn rate on one plug means that a significant portion of the = burn happens during the expansion stroke and less heat is converted to = power. =20 Uh, not really. You can actually end up with MORE power, depending on = where the thetaPP started. Further, when the mixture is leaned past the best power (or maybe peak = EGT) the flame travel is even slower and consequently the exhaust = temperature will likely just continue to go up when leaning, not peak = and go down. NO! EGT will always rise to peak, then fall when LOP. ALWAYS. Unless, = of course, Sir Isaac Newton was wrong. --Apple-Mail=_9213E0BF-CAE4-4DAA-8B34-79F869935882 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=iso-8859-1

True

The slower burn rate on one plug means that a significant portion of = the burn happens during the expansion stroke and less heat is converted = to power.

Uh, not really. You can = actually end up with MORE power, depending on where the thetaPP = started.

Further, when the = mixture is leaned past the best power (or maybe peak EGT) the flame = travel is even slower and consequently the exhaust temperature will = likely just continue to go up when leaning, not peak and go down.

NO! EGT will always rise to peak, = then fall when LOP. ALWAYS. Unless, of course, Sir Isaac = Newton was = wrong.

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