X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 27 May 2006 23:13:19 -0400 Message-ID: X-Original-Return-Path: Received: from wind.imbris.com ([216.18.130.7] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTPS id 1130647 for lml@lancaironline.net; Sat, 27 May 2006 21:56:56 -0400 Received-SPF: none receiver=logan.com; client-ip=216.18.130.7; envelope-from=brent@regandesigns.com Received: from [192.168.1.100] (vsat-148-63-101-227.c002.t7.mrt.starband.net [148.63.101.227]) (authenticated bits=0) by wind.imbris.com (8.12.11/8.12.11.S) with ESMTP id k4S1trrF010149 for ; Sat, 27 May 2006 18:55:59 -0700 (PDT) (envelope-from brent@regandesigns.com) X-Original-Message-ID: <44790320.8050503@regandesigns.com> X-Original-Date: Sat, 27 May 2006 18:55:44 -0700 From: Brent Regan User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: Re: Weakening hydraullic pressure over time in IVP Content-Type: multipart/alternative; boundary="------------020400040304000706020803" This is a multi-part message in MIME format. --------------020400040304000706020803 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Doug, Sounds like your accumulator N2 charge has lost some pressure. As the accumulator pressure drops the useful capacity of the accumulator also drops. The "empty" precharge pressure isn't listed in the manual but Ross would know. I would think that the precharge should be on the order of 100 to 300 PSI to give the best volume capacity. Remember too that, because the accumulator "lives" at high pressure (~1100 PSI) it is possible for most of the prercharge to leak out at this pressure, leaving the empty precharge of less than zero. After recharging the accumulator, do a leak test with some soap solution around the valve stem. You can probably service the accumulator with the same equipment used for struts. Again, check with the factory on the details as I am just guessing. Regards Brent Regan --------------020400040304000706020803 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Doug,

Sounds like your accumulator N2 charge has lost some pressure.  As the accumulator pressure drops the useful capacity of the accumulator also drops. The "empty" precharge pressure isn't  listed in the manual but Ross would know. I would think that the precharge should be on the order of 100 to 300 PSI to give the best volume capacity.

Remember too that, because the accumulator "lives" at high pressure (~1100 PSI) it is possible for most of the prercharge to leak out at this pressure, leaving the empty precharge of less than zero.

After recharging the accumulator, do a leak test with some soap solution around the valve stem.  You can probably service the accumulator with the same equipment used for struts. Again, check with the factory on the details as I am just guessing.

Regards
Brent Regan
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