X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTP id 1921597 for flyrotary@lancaironline.net; Wed, 14 Mar 2007 20:07:53 -0400 Received-SPF: none receiver=logan.com; client-ip=205.152.59.68; envelope-from=rusty@radrotary.com Received: from ibm64aec.bellsouth.net ([65.6.194.9]) by imf20aec.mail.bellsouth.net with ESMTP id <20070315000707.DUPO13081.imf20aec.mail.bellsouth.net@ibm64aec.bellsouth.net> for ; Wed, 14 Mar 2007 20:07:07 -0400 Received: from rd ([65.6.194.9]) by ibm64aec.bellsouth.net with ESMTP id <20070315000707.VFVB11293.ibm64aec.bellsouth.net@rd> for ; Wed, 14 Mar 2007 20:07:07 -0400 From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Water Plumbing Date: Wed, 14 Mar 2007 19:07:17 -0500 Message-ID: <008801c76695$e4f76fd0$6e01a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0089_01C7666B.FC23B1C0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6822 Importance: Normal Thread-Index: AcdmiDcjbymqwd45QFaVerzh2FkZnQAC4mrg In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_0089_01C7666B.FC23B1C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Is it possible to plumb the system without a pressure tank?=20 =20 Hi Steve, =20 When you say pressure tank, I'm assuming you mean what Mazda called the = AST or air separator tank. This is a pressurized tank with a hose at the bottom, one in the middle, and a cap with overflow at the top. =20 =20 You certainly can run without it, and I believe the 1st and 2nd gen = RX-7's did just that. Mazda added it on the 3rd gen, and from what I = understand, it's a good feature, because getting all the air out of the system is = good for cooling. =20 =20 I have an inline radiator cap with AN connectors on both ends and was wondering if I can just use that without the pressure tank.=20 =20 You could, but it won't be ideal. =20 =20 Or can a pressure tank be located below the highest point?=20 =20 Yep, it sure can. The only problem would be filling the system, so = you'd need a higher point on the engine to do that. =20 =20 How about putting an AST as high as you can, then put your inline = radiator cap in the high point of the system at the pump outlet. That would make = a dandy fill port. The radiator cap on the AST would need to be lower pressure than the one on the fill port. BTW, the above situation is = exactly what the 3rd gen RX-7 has :-) =20 Cheers, Rusty=20 ------=_NextPart_000_0089_01C7666B.FC23B1C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Is it possible to plumb the system without a pressure tank? 
 
Hi=20 Steve,
 
When you say=20 pressure tank, I'm assuming you mean what Mazda called the AST or air = separator=20 tank.  This is a pressurized tank with a hose at the bottom, one in = the=20 middle, and a cap with overflow at the top. 
 
You certainly=20 can run without it, and I believe the 1st and 2nd gen RX-7's did just=20 that.  Mazda added it on the 3rd gen, and from what I understand, = it's a=20 good feature, because getting all the air out of the system is good for=20 cooling.   
 
   I have an = inline=20 radiator cap with AN connectors on both ends and was wondering if I can = just use=20 that without the pressure tank. 
 
You could,=20 but it won't be ideal. 
 
   Or can a = pressure tank=20 be located below the highest point? 
 
Yep, it sure=20 can.  The only problem would be filling the system, so you'd need a = higher=20 point on the engine to do that.  
 
How about=20 putting an AST as high as you can, then put your inline radiator = cap in=20 the high point of the system at the pump outlet.  That would = make a=20 dandy fill port.  The radiator cap on the AST would need to be = lower=20 pressure than the one on the fill port.  BTW, the = above situation=20 is exactly what the 3rd gen RX-7 has :-)
 
Cheers,
Rusty 
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