Return-Path: Received: from wb2-a.mail.utexas.edu ([128.83.126.136] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP-TLS id 360910 for flyrotary@lancaironline.net; Wed, 11 Aug 2004 09:27:31 -0400 Received-SPF: none receiver=logan.com; client-ip=128.83.126.136; envelope-from=msteitle@mail.utexas.edu Received: (qmail 11193 invoked from network); 11 Aug 2004 13:27:00 -0000 Received: from dhcp-191-101.per.utexas.edu (HELO benefits3.mail.utexas.edu) (146.6.191.101) by wb2.mail.utexas.edu with RC4-SHA encrypted SMTP; 11 Aug 2004 13:27:00 -0000 Message-Id: <5.1.1.5.2.20040811082251.025fa630@localhost> X-Sender: msteitle@mail.utexas.edu@localhost X-Mailer: QUALCOMM Windows Eudora Version 5.1.1 Date: Wed, 11 Aug 2004 08:26:54 -0500 To: "Rotary motors in aircraft" From: Mark Steitle Subject: Re: [FlyRotary] Pressure switch In-Reply-To: Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=====================_57515453==.ALT" --=====================_57515453==.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed At 10:35 PM 8/10/2004 -0700, you wrote: > > > > >Subject: [FlyRotary] Re: returnless fuel system > > > >Al, I know that my fuel pressure sensor was originally specified for oil >and they said to just use it for fuel. I would imagine that there is not >much difference between oil and fuel as far as diaphragm tolerance. > >That s kind of what I figured also. But I seem to recall that in the >descriptive for an oil pressure switch I was looking at it said not for >use with fuel , which got me wondering. I m not so concerned about a >malfunction because it can be checked every run-up by turning off the >primary pump, but I don t want a potential leak. > > > >http://www.bandc.biz/S8012.html > > > >I had looked at this; but it is N.O. and closes with pressure, and I want >the opposite, and don t know at what pressure it switches. I think I had a >lead on one at the local speed shop that was N.C. and opened below 16 >psi. Also specified for oil. > > > >Also, check out this great selection of fittings I just found. I wish I >had them long ago, would have made my sensor installation easier. > > > >http://www.livermoreperformance.com/XRP_Adapters.html#Special > > > >What a great site for fittings! Especially now that all our plumbing is >completedJ > > > >Al Al, I used the B&C pressure switch you referenced. It is actually two switches in one. One terminal is N.O. then closes when oil pressure rises; and a second terminal that is N.C. and then opens when pressure rises. The purpose is to serve as an oil pressure warning light, and also as a trigger to the Hobbs meter... all in one switch. Works as advertised, but I never thought of using it for fuel pressure. Mark S. --=====================_57515453==.ALT Content-Type: text/html; charset="us-ascii" At 10:35 PM 8/10/2004 -0700, you wrote:

 

 

Subject: [FlyRotary] Re: returnless fuel system

 

Al, I know that my fuel pressure sensor was originally specified for oil and they said to just use it for fuel.  I would imagine that there is not much difference between oil and fuel as far as diaphragm tolerance.

That s kind of what I figured also.  But I seem to recall that in the descriptive for an oil pressure switch I was looking at it said not for use with fuel , which got me wondering. I m not so concerned about a malfunction because it can be checked every run-up by turning off the primary pump, but I don t want a potential leak.

 

http://www.bandc.biz/S8012.html

 

I had looked at this; but it is N.O. and closes with pressure, and I want the opposite, and don t know at what pressure it switches. I think I had a lead on one at the local speed shop that was N.C. and opened below 16 psi.  Also specified for oil.

 

Also, check out this great selection of fittings I just found.  I wish I had them long ago, would have made my sensor installation easier.

 

http://www.livermoreperformance.com/XRP_Adapters.html#Special

 

What a great site for fittings!  Especially now that all our plumbing is completedJ

 

Al

Al,
I used the B&C pressure switch you referenced.  It is actually two switches in one.   One terminal is N.O. then closes when oil pressure rises; and a second terminal that is N.C. and then opens when pressure rises.  The purpose is to serve as an oil pressure warning light, and also as a trigger to the Hobbs meter... all in one switch.  Works as advertised, but I never thought of using it for fuel pressure. 

Mark S. --=====================_57515453==.ALT--