X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao102.cox.net ([68.230.241.44] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTP id 2736030 for flyrotary@lancaironline.net; Mon, 18 Feb 2008 23:22:46 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.44; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao102.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20080219042205.GKBQ20092.fed1rmmtao102.cox.net@fed1rmimpo02.cox.net> for ; Mon, 18 Feb 2008 23:22:05 -0500 Received: from BigAl ([72.192.137.74]) by fed1rmimpo02.cox.net with bizsmtp id rGN61Y00Q1cVYgg0000000; Mon, 18 Feb 2008 23:22:07 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: staging1 Date: Mon, 18 Feb 2008 20:23:43 -0800 Message-ID: <000001c872af$3688d700$6401a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C8726C.28659700" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C8726C.28659700 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I think??? things just get heat soaked once there is no air flowing Don; Are the pumps at the lowest point of the fuel system before the pumps? = Are they at or near the bottom of the firewall. If the first answer is yes, = it is likely heat soaking after shutdown. The coolest place in the cowl = after shutdown is at bottom. I have the pumps near the bottom the firewall = and gravity fed from the supply. Did lots of tuning on the ground to high coolant and oil temps and never had a cavitation problem. =20 For all of you that have successfully tuned your engine and are = flying, did you do all or most of your mixture tuning in mode 1. I may be = making this too hard. =20 Before changing the default table entries you'll want to work with = manual mixture adjustment and try to set modes 3 and 6. Run it up to just below staging and adjust mode 3 to get the mixture about right. Anticipating = the big difference in injector size; maybe do that mode 3 adjustment with = the mixture knob at about 3 o'clock. Then go to mode 6 and try to adjust to = get it to just cross the stage point smoothly. You'd expect it to go too = rich, so be ready to swing the mixture knob toward lean to keep it running. Re-adjust mode 3 later when you can run the range if it seems = appropriate.=20 =20 Then do rough tuning of the correction table values with mode 1. Unless = the corrections are way off, you may find it easier using mode 9 at each increment of manifold pressure; or go directly to auto-tune. In any = case you need an O2 sensor display, and you'll want the mixture correction = table display working on the EM2. =20 These are just my thoughts. Tracy is the expert, so his comments would = take precedence. =20 Remember - tenacity and patience. =20 Al ------=_NextPart_000_0001_01C8726C.28659700 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I think??? things just get = heat soaked once there is no air flowing

Don;

Are the pumps at the lowest point = of the fuel system before the pumps? Are they at or near the bottom of the = firewall. If the first answer is yes, it is likely heat soaking after = shutdown. The coolest place in the cowl after shutdown is at bottom. I have the = pumps near the bottom the firewall and gravity fed from the supply. Did lots = of tuning on the ground to high coolant and oil temps and never had a cavitation = problem.

For all = of you that have successfully tuned your engine and are flying, did you do all = or most of your mixture tuning in mode 1. I may be making this too = hard.

Before changing the default table entries you’ll want to work with manual mixture adjustment and try = to set modes 3 and 6. Run it up to just below staging and adjust mode 3 to get = the mixture about right. Anticipating the big difference in injector = size; maybe do that mode 3 adjustment with the mixture knob at about = 3 o’clock. Then = go to mode 6 and try to adjust to get it to just cross the stage point = smoothly. You’d expect it to go too rich, so be ready to swing the mixture knob toward = lean to keep it running. Re-adjust mode 3 later when you can run the range if it = seems appropriate.

Then do rough tuning of the = correction table values with mode 1. Unless the corrections are way off, you = may find it easier using mode 9 at each increment of manifold pressure; or = go directly to auto-tune. In any case you need an O2 sensor display, = and you’ll want the mixture correction table display working on the = EM2.

These are just my thoughts. = Tracy is the = expert, so his comments would take precedence.

Remember – tenacity and = patience.

Al

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