Return-Path: <13brv3@bellsouth.net> Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2891950 for flyrotary@lancaironline.net; Mon, 15 Dec 2003 14:29:31 -0500 Received: from rad ([68.212.7.74]) by imf19aec.mail.bellsouth.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20031215192930.RJGC4035.imf19aec.mail.bellsouth.net@rad> for ; Mon, 15 Dec 2003 14:29:30 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Fuel System Date: Mon, 15 Dec 2003 13:29:31 -0600 Message-ID: <00b501c3c341$c3739b90$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00B6_01C3C30F.78D92B90" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_00B6_01C3C30F.78D92B90 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable I guess I am missing something. I am not familiar with the primary and secondary injectors. I thought the fuel rail fed all of the injectors. My idea was to split the rail into two rails fed from the = same source just that the returns go to different tanks. I don't see how the computer settings would affect this. What am I missing? Thanks for any help. Joe Hi Joe, =20 From your earlier description, I see the part that you're missing. The = way the fuel is plumbed is: Tank, pump, fuel rails, regulator, return to = tank. In the RX-7, the fuel runs into one end of the of (primary I think) = rail, then out the other end of the rail to one end of the other rail. The = other end of the second rail has a regulator, which allows excess pressure to bleed off, and return to the tank. Certainly, you can T the fuel pump = into both rails, then T the other end of the rails together, and put them to = a regulator. No matter how you slice it though, there's only one return = per regulator. =20 =20 In case this doesn't make sense, I'll repeat a great analogy that = someone else (Tracy maybe) gave before. Imagine a garden hose, with the faucet turned on. Now put your thumb partially over the end of the hose. You = can change the pressure within the hose, by varying your thumb pressure on = the end of the hose. That's how these regulators work. =20 =20 Did that help? =20 Cheers, Rusty (insert Japanese thumb for Mazda regulators)=20 ------=_NextPart_000_00B6_01C3C30F.78D92B90 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

         I = guess I am=20 missing something.  I am not familiar with the
primary and = secondary=20 injectors.  I thought the fuel rail fed all of = the
injectors.  My=20 idea was to split the rail into two rails fed from the same
source = just that=20 the returns go to different tanks.  I don't see how the
computer = settings would affect this.  What am I missing?  Thanks for = any=20 help.

Joe

Hi=20 Joe,
 
From = your earlier=20 description, I see the part that you're missing.   The way the = fuel is=20 plumbed is:  Tank, pump, fuel rails, regulator, return to = tank.  In=20 the RX-7, the fuel runs into one end of the of (primary I = think) rail, then=20 out the other end of the rail to one end of the other rail.  The = other end=20 of the second rail has a regulator, which allows excess pressure to = bleed off,=20 and return to the tank.  Certainly, you can T the fuel pump into = both=20 rails, then T the other end of the rails together, and put them to a=20 regulator.  No matter how you slice it though, there's only one = return per=20 regulator. 
 
In case = this doesn't=20 make sense, I'll repeat a great analogy that someone else (Tracy maybe) = gave=20 before.  Imagine a garden hose, with the faucet turned on.  = Now put=20 your thumb partially over the end of the hose.  You can change = the=20 pressure within the hose, by varying your thumb pressure on the end of = the=20 hose.  That's how these regulators = work.  
 
Did that = help?
 
Cheers,
Rusty = (insert Japanese=20 thumb for Mazda regulators) 


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