X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost05.isp.att.net ([204.127.217.105] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3818102 for flyrotary@lancaironline.net; Wed, 19 Aug 2009 09:59:46 -0400 Received-SPF: pass receiver=logan.com; client-ip=204.127.217.105; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-210-52-80.mco.bellsouth.net[68.210.52.80]) by isp.att.net (frfwmhc05) with SMTP id <20090819135909H0500sdsrke>; Wed, 19 Aug 2009 13:59:09 +0000 X-Originating-IP: [68.210.52.80] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Colorful coolant. Date: Wed, 19 Aug 2009 09:59:11 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0038_01CA20B3.B3EA6C00" X-Mailer: Microsoft Office Outlook 11 Thread-Index: Acog0pd5EMqMbc3UTqCs7T9UHXfBXQAAnPjg X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 This is a multi-part message in MIME format. ------=_NextPart_000_0038_01CA20B3.B3EA6C00 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I think he is talking about brands of ethylene glycol antifreeze. Prestone is green and Zerox is yellow??? Bill B _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen Sent: Wednesday, August 19, 2009 10:40 AM To: Rotary motors in aircraft Subject: [FlyRotary] Colorful coolant. Ok now comes the tricky question...... Green coolant ..or..Orange coolant..? Or make that the psycodelic question. What cools better in our situation? David Cook RV6A Rotary. My advice is - stay away from the orange coolant. I assume by orange you mean Dex-Cool or similar so-called "extended use" silicone based stuff. I had it in my system for about 18 months. I initially noticed that where some hot coolant from the overflow splashed onto the outside of the aluminum coolant lines it left an indelible stain. That seemed weird, but I didn't do anything about it. After about 18 months of use I took out my wing-root radiator to work on the air ducting, and looking into the end tank I could see strange globs of yellow deposits around the edges of the tube entrances; enough the impede flow. I took out my in-cowl rad for inspection, and found the same thing there. I took the rads to a radiator shop; had them flushed, flow and pressure tested. The deposits flushed out and all was fine, and worked great since - with E-G (yellow) coolant. I use about 30% coolant and distilled water. I don't know what the deposits were, and neither did the guy at the rad shop; but his advice was not to use dex-cool. Al G ------=_NextPart_000_0038_01CA20B3.B3EA6C00 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I think he is talking about brands of ethylene glycol = antifreeze.  Prestone is green and Zerox is yellow???

Bill B 

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen
Sent: Wednesday, August = 19, 2009 10:40 AM
To: Rotary motors in = aircraft
Subject: [FlyRotary] = Colorful coolant.

 

Ok now comes = the tricky question...... Green coolant ..or..Orange coolant..?  Or make that = the psycodelic question.   What cools better in our situation?        David Cook  = RV6A Rotary.

My advice is – stay away = from the orange coolant.  I assume by orange you mean Dex-Cool or similar = so-called “extended use” silicone based stuff.  I had it in my = system for about 18 months.  I initially noticed that where some hot = coolant from the overflow splashed onto the outside of the aluminum coolant lines it = left an indelible stain.  That seemed weird, but I didn’t do anything = about it.  After about 18 months of use I took out my wing-root radiator = to work on the air ducting, and looking into the end tank I could see strange = globs of yellow deposits around the edges of the tube entrances; enough the = impede flow.  I took out my in-cowl rad for inspection, and found the same = thing there.

 

I took the rads to a radiator = shop; had them flushed, flow and pressure tested.  The deposits flushed out = and all was fine, and worked great since – with E-G (yellow) = coolant.

 

I use about 30% coolant and = distilled water.  I don’t know what the deposits were, and neither did = the guy at the rad shop; but his advice was not to use = dex-cool.

 

Al G =

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