X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 14 Jun 2011 07:56:49 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-spurfowl.atl.sa.earthlink.net ([209.86.89.66] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with ESMTP id 5019580 for lml@lancaironline.net; Mon, 13 Jun 2011 21:00:55 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.66; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=ipRmcj/GwUbzJHzuQdlygQD0nP78CGxKTCMQSJM0eaJoJUdwfG0pWruFIWOv6Arb; h=Received:Content-Type:Mime-Version:Subject:From:In-Reply-To:Date:Content-Transfer-Encoding:Message-Id:References:To:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [216.57.118.194] (helo=[192.168.1.100]) by elasmtp-spurfowl.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1QWHzP-0006Xh-GA for lml@lancaironline.net; Mon, 13 Jun 2011 21:00:19 -0400 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Apple Message framework v1082) Subject: Re: [LML] Re: Pressurization From: Colyn Case In-Reply-To: X-Original-Date: Mon, 13 Jun 2011 21:00:15 -0400 Content-Transfer-Encoding: quoted-printable X-Original-Message-Id: References: X-Original-To: "Lancair Mailing List" X-Mailer: Apple Mail (2.1082) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da9401fc737854c9075aeffb6ff423273f3bb350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 216.57.118.194 Pete, can you please send me that part number for the little vac pump? On Mar 22, 2011, at 9:00 AM, Pete Sinclair wrote: > The wiring diagrams I have seen show the gear switch grounding pin 4 = of the pressure head for planes without vacuum, and pin 13 if you have = vacuum. I think this is backwards. Pin 4 opens a solenoid in the = pressure head that connects the vacuum port directly to the bellows. = This allows the vacuum to pull the bellows fully open (dump mode). So, = if you have vacuum, you want pin 4 grounded when on the ground and = taking off (to prevent the pop you get when going to full power). I = added a small electric vacuum pump to mine to do this that goes on = whenever pin 4 is grounded. >=20 > Pin 13 goes to a second solenoid in the pressure head, but I have yet = to figure out what it does. >=20 > Pete >=20 > -----Original Message----- > From: billhogarty [mailto:billhogarty@hughes.net]=20 > Sent: Sunday, March 20, 2011 6:29 AM > To:=20 > Subject: Pressurization >=20 > For Pete Sinclair: >=20 > Pete: Looks like you might be the expert on this topic. I was = looking for a preflight check but thought that the system was grounded = thru the=20 > gear down switch. Any help here?? >=20 > Thanks, Bill Hogarty >=20 > -- > For archives and unsub = http://mail.lancaironline.net:81/lists/lml/List.html