X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 5.1c.2) with ESMTP id 1315244 for flyrotary@lancaironline.net; Tue, 25 Jul 2006 11:29:27 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.66; envelope-from=brecab@bellsouth.net Received: from ibm59aec.bellsouth.net ([68.18.117.61]) by imf18aec.mail.bellsouth.net with ESMTP id <20060725152830.PKMF10480.imf18aec.mail.bellsouth.net@ibm59aec.bellsouth.net> for ; Tue, 25 Jul 2006 11:28:30 -0400 Received: from 1dd8d01.bellsouth.net ([68.18.117.61]) by ibm59aec.bellsouth.net with ESMTP id <20060725152830.FEMZ19687.ibm59aec.bellsouth.net@1dd8d01.bellsouth.net> for ; Tue, 25 Jul 2006 11:28:30 -0400 Message-Id: <7.0.1.0.1.20060725111312.0231f9f0@bellsouth.net> X-Mailer: QUALCOMM Windows Eudora Version 7.0.1.0 Date: Tue, 25 Jul 2006 11:27:50 -0400 To: "Rotary motors in aircraft" From: CCI Subject: Re: [FlyRotary] Coolant In-Reply-To: References: Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=====================_15389989==.ALT" --=====================_15389989==.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed Hi Al, The actual Dex-Cool (which is no longer available) will do in any rubber seals in the engine, for sure. I have a Chevrolet with a 3.1 V-6 and at 60,000 had to replace the rubber intake manifold seals. When I got it apart there was not much left of them. I use the Prestone "Dex-Cool Approved" antifreeze now and have had no problems. ( in my old van, too) There is a class action lawsuit going on right now, I understand against the manufacturer of Dex-Cool. There is a service bullitin from GM to replace the Dex-Cool with an approved anti-freeze, so it is no myth. As long as you aren't running actual Dex-Cool, you'll be fine. Fred At 08:04 AM 7/25/2006 -0700, you wrote: >I came across this statement on a web site discussing cooling issues >with RX-7s: > >Use a 30/70 mixture of ethylene glycol and water. Never use "red" >coolant (Dex-Cool) as it is very corrosive to the seals inside the >rotary engine. > >I am using about a 30/70 mix of Prestone "Dex-Cool Approved" and >water. From what I read, Dex-Cool was formulated by GM engineers >specifically to give improved cooling and better corrosion >protection for aluminum radiators. I have two custom aluminum >radiators in my airplane, along with some aluminum housings in the >engine. Seemed to me the Dex-Cool formulation was clearly the way to go. > >Is the above statement just some bogus statement based on myth, or >does somebody on this list have some data/experience to support it. > >I've also been using this stuff in my old van and XJS for years with >no issues. > >Al > --=====================_15389989==.ALT Content-Type: text/html; charset="us-ascii" Hi Al, The actual Dex-Cool (which is no longer available) will do in any rubber seals in the engine, for sure. I have a Chevrolet with a 3.1 V-6 and at 60,000 had to replace the rubber intake manifold seals. When I got it apart there was not much left of them. I use the Prestone "Dex-Cool Approved" antifreeze now and have had no problems. ( in my old van, too) There is a class action lawsuit going on right now, I understand against the manufacturer of Dex-Cool. There is a service bullitin from GM to replace the Dex-Cool with an approved anti-freeze, so it is no myth. As long as you aren't running actual Dex-Cool, you'll be fine. Fred

At 08:04 AM 7/25/2006 -0700, you wrote:

I came across this statement on a web site discussing cooling issues with RX-7s:

Use a 30/70 mixture of ethylene glycol and water. Never use "red" coolant (Dex-Cool) as it is very corrosive to the seals inside the rotary engine.

I am using about a 30/70 mix of Prestone “Dex-Cool Approved” and water. From what I read, Dex-Cool was formulated by GM engineers specifically to give improved cooling and better corrosion protection for aluminum radiators. I have two custom aluminum radiators in my airplane, along with some aluminum housings in the engine. Seemed to me the Dex-Cool formulation was clearly the way to go.

Is the above statement just some bogus statement based on myth, or does somebody on this list have some data/experience to support it.

I’ve also been using this stuff in my old van and XJS for years with no issues.

Al

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