Return-Path: Received: from [65.173.216.71] (HELO mtasmtp1-clev.cle.ms.philips.com) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3147298 for lml@lancaironline.net; Mon, 05 Apr 2004 15:37:12 -0400 Received: from picker.com ([149.59.192.105]) by mtasmtp1-clev.cle.ms.philips.com (Lotus Domino Release 5.0.11) with SMTP id 2004040515324393:15167 ; Mon, 5 Apr 2004 15:32:43 -0400 Received: from [149.59.205.63] (HELO Philips.com) by picker.com (CommuniGate Pro SMTP 3.3b1) with ESMTP id 16568883 for lml@lancaironline.net; Mon, 05 Apr 2004 15:37:09 -0400 Message-ID: <4071B589.7060004@Philips.com> Date: Mon, 05 Apr 2004 15:37:45 -0400 From: Rob Logan Reply-To: Rob@Logan.com User-Agent: Mozilla/5.0 (X11; U; SunOS sun4u; en-US; rv:1.0.1) Gecko/20020921 Netscape/7.0 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Lancair Mailing List Subject: Re: [LML] Re: Partial power loss - IMC References: X-MIMETrack: Itemize by SMTP Server on mtasmtp1-clev/P/SERVER/PHILIPS-CLE(Release 5.0.11 |July 24, 2002) at 04/05/2004 03:32:43 PM, Serialize by Router on mtasmtp1-clev/P/SERVER/PHILIPS-CLE(Release 5.0.11 |July 24, 2002) at 04/05/2004 03:32:46 PM, Serialize complete at 04/05/2004 03:32:46 PM Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii; format=flowed once over the rockies in a l4p IMC there was a loud ZITTTT and it was like someone turned the lights off it got so dark so fast with the instant load of ice... on came the alt air light meaning the spring door opened letting DRY air in the engine.. even after all the ice had departed the aircraft, the alt air light was still on, more do to the airflow a 550 can pump than a wet/iced filter. > consider the ram air as the "alternate" air source during any engine difficulty. I'm not so sure that's a source of DRY air... I have three sources of air: filtered, spring bypass, and ram... and my filter is still too small because I see such a large delta with ram.. http://lancairlegacy.com/Mahar_images/airbox_lrg.jpg I turn off ram any time the peto heat is on... there is too much stuff for ice to stick to, and I would never be able to close the door once ice forms. as George points out, in certified installs the FAA requires hot alt air... the cuff on this alt air input is near the hot eshoust http://rob.com/lancair/Others/NorthCoast/north.jpg > Wrong-o, full rich and still hot, I think Walter was trying to say if the CHTs go up you might need to "re-peak" as the amount of air has changed.. a good example of this is when I turn on ram after peaking filtered air... there is way too much ram air and the engine falters noticeably until I give it more gas.. > Mooney engineer told me "Don't use the ram > air on a fuel injected engine". ram air is a good thing as long as you keep positive pressure to the injectors http://lancair.net/lists/lml/Message/23078.html thanks for shairing... the more we think, the more we understand.