X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 19 Apr 2010 05:58:55 -0400 Message-ID: X-Original-Return-Path: Received: from betsy.gendns5.com ([65.254.38.234] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTPS id 4225498 for lml@lancaironline.net; Sun, 18 Apr 2010 09:10:29 -0400 Received-SPF: none receiver=logan.com; client-ip=65.254.38.234; envelope-from=paul@tbm700.com Received: from 6.21.204.68.cfl.res.rr.com ([68.204.21.6]:60437 helo=[192.168.1.101]) by betsy.gendns5.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.69) (envelope-from ) id 1O3UFy-00040h-97 for lml@lancaironline.net; Sun, 18 Apr 2010 09:09:50 -0400 From: paul miller Mime-Version: 1.0 (Apple Message framework v1078) Content-Type: multipart/alternative; boundary=Apple-Mail-2--916271825 Subject: Re: [LML] Fuel Pressure X-Original-Date: Sun, 18 Apr 2010 09:09:47 -0400 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <5C40CC52-ADEB-46F9-9FB8-FD4E27E3EA89@tbm700.com> X-Mailer: Apple Mail (2.1078) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - betsy.gendns5.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - tbm700.com --Apple-Mail-2--916271825 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Jon: some comments that may help. You didn't mention if you had SID-97 = 3E http://www.tcmlink.com/pdf2/SID97-3E.pdf On 2010-04-17, at 10:21 PM, Jon Socolof wrote: > A low or high unmetered fuel pressure would indicate the engine is = not being supplied with enough or too much fuel and this seems like the = more critical information. The gauge port on the flow divider for = metered fuel pressure seems to be used primarily to drive a pressure = type fuel flow gauge not applicable in my case. The port can be used to connect a fuel pressure gauge to setup the fuel = pressures per the SID referred to by Dennis. My IO-550N use a flow = transducer for measuring flow during flight but the ports are used for = the setup and maintenance checks. I'm sure others have plumbed = pressures into the avionics but you will need to confirm full power fuel = flows and pressure alone can't do that. In your first email, I thought = you were doing a setup of the fuel pressures and not plumbing to a = Garmin system for permanent indication in flight. I was referring to = the setup of pressures in the SID. > =20 > I will be re-plumbing to measure unmetered fuel pressure as this is = what Garmin values are set to on the G900 EIS for Continentals (Garmin = measures metered fuel pressure on Lycoming engines). I hope this makes = sense. > =20 That plumbing plus $1.00 will get you a cup of coffee and nothing else. = The metered pressure is what is delivered to the cylinders. There is = a lot of good information on this subject on the web. The first is = describes the continuous flow system and how the metered and unmetered = pressures connect to each other. http://www.kellyaerospace.com/articles/ContinuousFlow.pdf = http://www.amtonline.com/publication/article.jsp?pubId=3D1&id=3D5163&pageN= um=3D1 (This magazine is good for maintenance and you can get it online now and = subscriptions can be free) Plus, there is a TCM video on the subject hosted on the same site where = you will see two parts to the continuous flow setup: http://www.amtonline.com/videonetwork Lastly, there were good comments on LML on the location of the = transducer to avoid bends and turns. There was an excellent note on = the plumbing of the return line as well to the Andair selector valve. I = don't know if this helps or not but I enjoyed reading it again. Paul=20 N357V= --Apple-Mail-2--916271825 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Jon: = some comments that may help.  You didn't mention if you had SID-97 = 3E


On 2010-04-17, at = 10:21 PM, Jon Socolof wrote:

  A low or high unmetered fuel pressure = would indicate the engine is not being supplied with enough or too much = fuel and this seems like the more critical information.  The gauge = port on the flow divider for metered fuel pressure seems to be used = primarily to drive a pressure type fuel flow gauge not applicable in my = case.
 
I will be re-plumbing to measure unmetered fuel pressure as = this is what Garmin values are set to on the G900 EIS for Continentals = (Garmin measures metered fuel pressure on Lycoming engines).  I = hope this makes sense.
http://= www.kellyaerospace.com/articles/ContinuousFlow.pdf


(This = magazine is good for maintenance and you can get it online now and = subscriptions can be free)

Plus, there is a TCM = video on the subject hosted on the same site where you will see two = parts to the continuous flow setup:


Lastly, there were good comments = on LML on the location of the transducer to avoid bends and turns. =   There was an excellent note on the plumbing of the return line as = well to the Andair selector valve.  I don't know if this helps or = not but I enjoyed reading it = again.

Paul 
N357V
= --Apple-Mail-2--916271825--