X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 06 Feb 2012 15:23:27 -0500 Message-ID: X-Original-Return-Path: Received: from bthceg-momta01-cwmx.mycingular.net ([166.216.231.204] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with ESMTP id 5385069 for lml@lancaironline.net; Mon, 06 Feb 2012 14:20:50 -0500 Received-SPF: neutral receiver=logan.com; client-ip=166.216.231.204; envelope-from=nrgarvin@comcast.net X-Original-Return-Path: Received: from [198.228.193.201] ([198.228.193.201:39633] helo=[10.41.226.12]) by bthceg-momta01 (envelope-from ) (ecelerity 3.0.23.37692 r(37717)) with ESMTP id 3D/FA-16142-8E7203F4; Mon, 06 Feb 2012 11:20:15 -0800 Subject: Re: [LML] Re: VM1000 MAP sensor unit question References: From: neal garvin Content-Type: multipart/alternative; boundary=Apple-Mail-10-208966446 X-Mailer: iPhone Mail (8C148) In-Reply-To: X-Original-Message-Id: <1633127B-C249-4CF3-A15C-423A6065D401@comcast.net> X-Original-Date: Mon, 6 Feb 2012 14:19:47 -0500 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (iPhone Mail 8C148) --Apple-Mail-10-208966446 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii If using Hoppes be sure to completely submerge the injectors or the brass wi= ll be severely eroded where exposed to the air above the Hoppes solution.=20= . On Feb 6, 2012, at 12:24 PM, "pete@leapfrogventures.com" wrote: > Actually, I would not use the Hoppes gun solvent on brass parts. It works= great on stainless parts, but is too caustic for brass. Folks were using t= hem on TCM injectors (which are brass), until they discovered that it had is= sues and now they recommend MEK. >=20 > =20 >=20 > I suggest using MEK and an ultrasonic cleaner. Put the MEK and the part i= n a small plastic cup, and put the cup in the water in the ultrasonic cleane= r. This keeps the MEK away from the walls of the cleaner, but allows the wa= ves to penetrate to the part. >=20 > =20 >=20 > Pete >=20 > =20 >=20 > From: Sky2high@aol.com [mailto:Sky2high@aol.com]=20 > Sent: Sunday, February 05, 2012 5:31 AM > To: lml@lancaironline.net > Subject: Re: [LML] Re: VM1000 MAP sensor unit question >=20 > =20 >=20 > Mark, >=20 > =20 >=20 > Thanks, we'll see if that does it. >=20 > =20 >=20 > Scott >=20 > =20 >=20 > In a message dated 2/3/2012 12:51:45 P.M. Central Standard Time, mjrav@com= cast.net writes: >=20 > Hi Scott, >=20 > =20 >=20 > My graybeard mechanic recommends cleaning fuel injectors with Hoppe's gun s= olvent by soaking overnight. >=20 > It works like a charm. >=20 > =20 >=20 > Mark >=20 > ----- Original Message ----- >=20 > From: Sky2high@aol.com >=20 > To: lml@lancaironline.net >=20 > Sent: Friday, February 03, 2012 1:10 PM >=20 > Subject: [LML] VM1000 MAP sensor unit question >=20 > =20 >=20 > The EPI 800 and VM 1000 manifold pressure "sensor" consists of a brass blo= ck that is pipe thread tapped for a fitting connected to the MAP source on o= ne side and the actual pressure sensor mounted on the other side that is ele= ctrically connected to the VM computer. >=20 > =20 >=20 > Imbedded in the block is a porous metallic "restrictor" with the purpose o= f "smoothing" rapid fluctuations in the pressure and protecting the fragile a= ctual sensor. >=20 > =20 >=20 > If this restrictor becomes clogged with miniscule particulate, it further d= ampens pressure changes so that the MAP indication does not change rapidly a= s pressure rises or hardly at all as the pressure drops. At some steady sta= te the MAP indication seems correct and the actual sensor seems to be operat= ing properly. I.E. The tested pressure eventually makes it past the restri= ctor. >=20 > =20 >=20 > One of the ways to fix this is to clean the restrictor. Here is where I n= eed help. Because the restrictor mesh is so fine, what chemicals and what p= rocedure is best used to clean and restore the restrictor? Should a vibrati= ng parts/jewelry cleaner be used? It cannot just be soaked and blown out. >=20 > =20 >=20 > Thanks, >=20 > =20 >=20 > Scott Krueger =20 >=20 >=20 > No virus found in this incoming message. > Checked by AVG - www.avg.com=20 > Version: 9.0.926 / Virus Database: 271.1.1/4183 - Release Date: 02/03/12 0= 2:34:00 --Apple-Mail-10-208966446 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
If using Hoppes be sure to completely s= ubmerge the injectors or the brass will be severely eroded where exposed to t= he air above the Hoppes solution. 

.

On Feb 6, 2012, at 12:24 PM, "pete@leapfrogventures.com" <pete@leapfrogventures.com> wrote:

= Actually, I would not use the Hoppes gun solvent on b= rass parts.  It works great on stainless parts, but is too caustic for b= rass.  Folks were using them on TCM injectors (which are brass), until t= hey discovered that it had issues and now they recommend MEK.

 

I suggest using MEK and= an ultrasonic cleaner.  Put the MEK and the part in a small plastic cu= p, and put the cup in the water in the ultrasonic cleaner.  This keeps t= he MEK away from the walls of the cleaner, but allows the waves to penetrate= to the part.

 

Pete

<= p class=3D"MsoNormal"> 

From: Sky2high@aol.com [mailto:Sky2high@aol.= com]
Sent: Sunday, February 05, 2012 5:31 AM
To: = lml@lancaironline.net
Subject: Re: [LML] Re: VM1000 MAP se= nsor unit question

<= o:p> 

Mark, <= o:p>

 

Thanks, we'll see if that does it.

<= p class=3D"MsoNormal"> 

Scott<= /p>

 =

In a= message dated 2/3/2012 12:51:45 P.M. Central Standard Time, mjrav@comcast.net= writes:

Hi Scott,

=  

My graybeard mechanic recommends cleaning fuel= injectors with Hoppe's gun solvent by soaking overnight.<= /p>

It works like a c= harm.

 

Mark

----- Original Message -----

Sent: Friday, February 03, 2012 1:10= PM

Subject: [LML] VM1000 MAP sensor un= it question

 

<= span style=3D"font-size:10.0pt;font-family:"Arial","sans-seri= f";color:black">The EPI 800 and VM 1000 manifold pressure "sensor" cons= ists of a brass block that is pipe thread tapped for a fitting connecte= d to the MAP source on one side and the actual pressure sensor mounted o= n the other side that is electrically connected to the VM computer.

 <= o:p>

Imbedded in the block is a porous metallic "restrictor" with the purpo= se of "smoothing" rapid fluctuations in the pressure and protecting the= fragile actual sensor.

 

If this restrictor becomes clogged with min= iscule particulate, it further dampens pressure changes so that the MAP indi= cation does not change rapidly as pressure rises or hardly at all as the pre= ssure drops.  At some steady state the MAP indication seems correct and= the actual sensor seems to be operating properly.  I.E.  The test= ed pressure eventually makes it past the restrictor.

 

One of the way= s to fix this is to clean the restrictor.  Here is where I need help.&n= bsp; Because the restrictor mesh is so fine, what chemicals and what procedu= re 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.

 

<= span style=3D"font-size:10.0pt;font-family:"Arial","sans-seri= f";color:black">Thanks,

 

Scott Krueger  


No virus fou= nd in this incoming message.
Checked by AVG - www.avg.com
Version: 9.0.926 /= Virus Database: 271.1.1/4183 - Release Date: 02/03/12 02:34:00

= --Apple-Mail-10-208966446--