X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from fed1rmmtao107.cox.net ([68.230.241.39] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTP id 1924764 for flyrotary@lancaironline.net; Fri, 16 Mar 2007 12:43:06 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.39; envelope-from=steve@stevet.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao107.cox.net (InterMail vM.7.05.02.00 201-2174-114-20060621) with ESMTP id <20070316164221.KLZH321.fed1rmmtao107.cox.net@fed1rmimpo01.cox.net> for ; Fri, 16 Mar 2007 12:42:21 -0400 Received: from [192.168.2.203] ([68.6.58.190]) by fed1rmimpo01.cox.net with bizsmtp id bUiK1W00c46FLUs0000000; Fri, 16 Mar 2007 12:42:20 -0400 Mime-Version: 1.0 (Apple Message framework v752.2) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-49-335127309 Message-Id: <6E3E4032-1971-490A-B477-B832C5317B28@stevet.net> From: Steve Thomas Subject: Re: Water Plumbing Date: Fri, 16 Mar 2007 09:42:19 -0700 To: "Rotary motors in aircraft" X-Mailer: Apple Mail (2.752.2) --Apple-Mail-49-335127309 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Rusty, Is the recommended system pressure represented at the AST cap or the fill cap? I'm thinking that the system pressure will be set by the cap that is lowest in pressure. Therefore, according to your recommendation, the AST cap will set system pressure and the fill cap will probably not see much in the way of pressure release duties. Best Regards, Steve ____________________________________________________________________ On Mar 14, 2007, at 5:07 PM, Russell Duffy wrote: > Is it possible to plumb the system without a pressure tank? > > Hi Steve, > > 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. > > 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. > > 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. > > You could, but it won't be ideal. > > Or can a pressure tank be located below the highest point? > > 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. > > 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 :-) > > Cheers, > Rusty --Apple-Mail-49-335127309 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 Rusty,

Is the recommended system = pressure represented at the AST cap or the fill cap?=A0 I'm thinking = that the system pressure will be set by the cap that is lowest in = pressure.=A0 Therefore, according to your recommendation, the AST cap = will set system pressure and the fill cap will probably not see much in = the way of pressure release duties.=A0=A0

Best = Regards,

Steve=A0

=

On Mar 14, 2007, at 5:07 = PM, Russell Duffy wrote:

Is = it possible to plumb the system without a pressure tank?=A0

=A0

Hi = Steve,

=A0

When = you say pressure tank, I'm assuming you mean what Mazda called the AST = or air separator tank.=A0 This is a pressurized tank with a hose at the = bottom, one in the middle, and a cap with overflow at the top.=A0 =

=A0

You = certainly can run without it, and I believe the 1st and 2nd gen RX-7's = did just that.=A0 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.=A0=A0=A0

=A0

=A0=A0 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.=A0

=A0

You = could, but it won't be ideal.=A0

=A0

=A0=A0 Or can a pressure tank be = located below the highest point?=A0

=A0

Yep, = it sure can.=A0 The only problem would be filling the system, so you'd = need a higher point on the engine to do that.=A0=A0
=
=A0

How = about putting an AST=A0as high as you can, then put your inline radiator = cap in the=A0high point of the system at the pump outlet.=A0 That would = make a dandy fill port.=A0 The radiator cap on the AST would need to be = lower pressure than the one on the fill port.=A0=A0BTW, = the above situation is exactly what=A0the=A03rd gen RX-7 has = :-)

=A0

Cheers,

Rusty=A0

= --Apple-Mail-49-335127309--