Return-Path: <13brv3@bellsouth.net> Received: from imf24aec.mail.bellsouth.net ([205.152.59.72] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2922190 for flyrotary@lancaironline.net; Wed, 07 Jan 2004 20:42:58 -0500 Received: from rad ([68.155.99.73]) by imf24aec.mail.bellsouth.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20040108014257.JFNG1911.imf24aec.mail.bellsouth.net@rad> for ; Wed, 7 Jan 2004 20:42:57 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: evap core air pockets? Date: Wed, 7 Jan 2004 19:43:00 -0600 Message-ID: <000401c3d588$bfc28250$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C3D556.75281250" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C3D556.75281250 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Excuse my extreme rotary newness, but what are "parallel cores"? Thanks, MikeJ=20 =20 Consider yourself excused :-)=20 =20 Lots of folks use AC evaporator cores for radiators, and it typically requires two of them to cool a 13B engine. The plumbing options are "series", where you flow from the engine into one of the cores, then out = of that one, into the 2nd one, then out and back to the engine. = "Parallel" would be where you come out of the engine, then use a Y or a T to flow = to both cores at the same time. On the outlet of the cores, you Y or T = them again, and go back to the engine. =20 =20 The Parallel method offers less resistance, thus a theoretically higher = flow rate. It also puts the hottest coolant in contact with more cool air = than you would in series. This should clearly be the preferred method. The downside is the extra connections that are required, and the fact that sometimes it's hard to make the water flow evenly between the cores. = For example, if you need a few more turns, length of hose to get to one of = the cores, the other one will probably flow more coolant. In and extreme = case, hardly any coolant will pass through the more restrictive core. Series makes sure that both get even flow, and simplifies the plumbing. =20 =20 Cheers, Rusty ------=_NextPart_000_0005_01C3D556.75281250 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Excuse my extreme rotary newness, but what are "parallel=20 cores"?
Thanks,
MikeJ 
 
Consider=20 yourself excused :-) 
 
Lots of folks=20 use AC evaporator cores for radiators, and it typically requires two of = them to=20 cool a 13B engine.  The plumbing options are "series", where = you flow=20 from the engine into one of the cores, then out of that one, into=20 the 2nd one, then out and back to the engine.  =  "Parallel" would be where you come out of = the engine,=20 then use a Y or a T to flow to both cores at the same time.  = On the=20 outlet of the cores, you Y or T them again, and go back to the=20 engine.   
 
The Parallel=20 method offers less resistance, thus a theoretically higher flow = rate. =20 It also puts the hottest coolant in contact with more cool air than you = would in=20 series.  This should clearly be the preferred method.  The = downside is=20 the extra connections that are required, and the fact that sometimes = it's hard=20 to make the water flow evenly between the cores.  For example, = if you=20 need a few more turns, length of hose to get to one of the cores, the = other one=20 will probably flow more coolant.  In and extreme case, hardly any = coolant=20 will pass through the more restrictive core.  Series makes sure = that both=20 get even flow, and simplifies the = plumbing.  
 
Cheers,
Rusty
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