X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 03 Feb 2012 13:10:13 -0500 Message-ID: X-Original-Return-Path: Received: from imr-ma03.mx.aol.com ([64.12.206.41] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with ESMTP id 5381731 for lml@lancaironline.net; Fri, 03 Feb 2012 12:32:07 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.206.41; envelope-from=Sky2high@aol.com Received: from mtaomg-da01.r1000.mx.aol.com (mtaomg-da01.r1000.mx.aol.com [172.29.51.137]) by imr-ma03.mx.aol.com (8.14.1/8.14.1) with ESMTP id q13HVMTf009607 for ; Fri, 3 Feb 2012 12:31:22 -0500 Received: from core-mtb004a.r1000.mail.aol.com (core-mtb004.r1000.mail.aol.com [172.29.234.205]) by mtaomg-da01.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id 535C4E000085 for ; Fri, 3 Feb 2012 12:31:22 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Fri, 3 Feb 2012 12:31:21 -0500 (EST) Subject: VM1000 MAP sensor unit question X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_bcbf.79e95e98.3c5d73e9_boundary" X-Mailer: AOL 9.6 sub 168 X-Originating-IP: [67.175.156.123] x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:468518144:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d33894f2c19ea61cb --part1_bcbf.79e95e98.3c5d73e9_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit The EPI 800 and VM 1000 manifold pressure "sensor" consists of a brass block that is pipe thread tapped for a fitting connected to the MAP source on one side and the actual pressure sensor mounted on the other side that is electrically connected to the VM computer. Imbedded in the block is a porous metallic "restrictor" with the purpose of "smoothing" rapid fluctuations in the pressure and protecting the fragile actual sensor. If this restrictor becomes clogged with miniscule particulate, it further dampens pressure changes so that the MAP indication does not change rapidly as pressure rises or hardly at all as the pressure drops. At some steady state the MAP indication seems correct and the actual sensor seems to be operating properly. I.E. The tested pressure eventually makes it past the restrictor. One of the ways to fix this is to clean the restrictor. Here is where I need help. Because the restrictor mesh is so fine, what chemicals and what procedure is best used to clean and restore the restrictor? Should a vibrating parts/jewelry cleaner be used? It cannot just be soaked and blown out. Thanks, Scott Krueger --part1_bcbf.79e95e98.3c5d73e9_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

The EPI 800 and VM 1000 manifold pressure "sensor" consists of a brass= =20 block that is pipe thread tapped for a fitting connected to the=20 MAP source on one side and the actual pressure sensor mounted on the o= ther=20 side that is electrically connected to the VM computer.

Imbedded in the block is a porous metallic "restrictor" with the= =20 purpose of "smoothing" rapid fluctuations in the pressure and protecti= ng=20 the fragile actual sensor.

If this restrictor becomes clogged with miniscule particulate, it furt= her=20 dampens pressure changes so that the MAP indication does not change rapidly= as=20 pressure rises or hardly at all as the pressure drops. At some steady= =20 state the MAP indication seems correct and the actual sensor seems to be=20 operating properly. I.E. The tested pressure eventually makes i= t=20 past the restrictor.

One of the ways to fix this is to clean the restrictor. Here is = where=20 I need help. Because the restrictor mesh is so fine, what chemicals a= nd=20 what procedure is best used to clean and restore the restrictor?&= nbsp;=20 Should a vibrating parts/jewelry cleaner be used? It cannot just be s= oaked=20 and blown out.

Thanks,

Scott Krueger

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