X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from QMTA08.westchester.pa.mail.comcast.net ([76.96.62.80] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTP id 2736528 for flyrotary@lancaironline.net; Tue, 19 Feb 2008 08:29:40 -0500 Received-SPF: pass receiver=logan.com; client-ip=76.96.62.80; envelope-from=hoursaway1@comcast.net Received: from OMTA07.westchester.pa.mail.comcast.net ([76.96.62.59]) by QMTA08.westchester.pa.mail.comcast.net with comcast id rQYB1Y0051GhbT85803p00; Tue, 19 Feb 2008 13:28:40 +0000 Received: from rmailcenter20.comcast.net ([204.127.197.130]) by OMTA07.westchester.pa.mail.comcast.net with comcast id rRUy1Y0062pHKGU3T00000; Tue, 19 Feb 2008 13:28:58 +0000 X-Authority-Analysis: v=1.0 c=1 a=KstPmZXTIeP9iVOLdkhy4w==:17 a=-Zvjteb7ev4FJXaNp6QA:9 a=2DYcdTeS_w02TFmovGwA:7 a=jJHR3QrFidMlzNz5uT5pd4sAxJQA:4 a=4vB-4DCPJfMA:10 a=yTKglbHfOJkA:10 a=uX_wQuRyjFsbYCyzJn4A:9 a=jXwlPYH3_DiP1pOUjZMA:7 a=WHloMi88DQBVZf-swlYKgJC11RAA:4 a=37WNUvjkh6kA:10 Received: from [208.254.22.50] by rmailcenter20.comcast.net; Tue, 19 Feb 2008 13:28:58 +0000 From: hoursaway1@comcast.net To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: staging1 Date: Tue, 19 Feb 2008 13:28:58 +0000 Message-Id: <021920081328.929.47BAD99A000041B8000003A12206999735CE970E990E9C9D9A0108@comcast.net> X-Mailer: AT&T Message Center Version 1 (Oct 30 2007) X-Authenticated-Sender: aG91cnNhd2F5MUBjb21jYXN0Lm5ldA== MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_929_1203427738_0" --NextPart_Webmail_9m3u9jl4l_929_1203427738_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit CHECK TO BE SURE YOU HAVE THE LATEST MANUALS FROM TRACY, THEY HAVE CHANGED & HAVE A MUCH BETTER TUNING SEQUENCE THAN THE ORIGINALS. DAVID RV6A ROTARY. -------------- Original message -------------- From: "Al Gietzen" 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 --NextPart_Webmail_9m3u9jl4l_929_1203427738_0 Content-Type: text/html Content-Transfer-Encoding: 8bit

CHECK TO BE SURE YOU HAVE THE LATEST MANUALS FROM TRACY, THEY HAVE CHANGED & HAVE A MUCH BETTER TUNING SEQUENCE THAN THE ORIGINALS. DAVID RV6A ROTARY.

-------------- Original message --------------
From: "Al Gietzen" <ALVentures@cox.net>

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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