X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao106.cox.net ([68.230.241.40] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3818093 for flyrotary@lancaironline.net; Wed, 19 Aug 2009 09:40:10 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.40; envelope-from=alventures@cox.net Received: from fed1rmimpo03.cox.net ([70.169.32.75]) by fed1rmmtao106.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20090819133932.QIAA21192.fed1rmmtao106.cox.net@fed1rmimpo03.cox.net> for ; Wed, 19 Aug 2009 09:39:32 -0400 Received: from BigAl ([72.192.133.78]) by fed1rmimpo03.cox.net with bizsmtp id WDfY1c00L1hf1Cg04DfZ0g; Wed, 19 Aug 2009 09:39:33 -0400 X-VR-Score: 0.00 X-Authority-Analysis: v=1.0 c=1 a=rF4DvWWuuvpDO8oUIwMA:9 a=y3kzayDFng-3p99e1cvO32lka_YA:4 a=Cc5dkqd-0twyAnxDlD0A:9 a=pCusn7yc6Ay0mVgbbbIA:7 a=GyxxJKfdPYZjQr3IKXLl_DkIJqYA:4 X-CM-Score: 0.00 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: Colorful coolant. Date: Wed, 19 Aug 2009 06:40:12 -0800 Message-ID: <155D36201A3C4530A0E600B373F3C38A@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000E_01CA2097.E7169D90" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6838 Importance: Normal Thread-Index: AcogiO0ovtJQM7JnTcajbHLmYZAxNQAT55og In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_000E_01CA2097.E7169D90 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable =20 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. =20 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. =20 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. =20 Al G=20 ------=_NextPart_000_000E_01CA2097.E7169D90 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

 

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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