X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-bw0-f223.google.com ([209.85.218.223] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3816985 for flyrotary@lancaironline.net; Tue, 18 Aug 2009 12:40:41 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.218.223; envelope-from=lehanover@gmail.com Received: by bwz23 with SMTP id 23so515688bwz.1 for ; Tue, 18 Aug 2009 09:40:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:date:message-id:subject :from:to:content-type; bh=UIgLaU5xOHHv4vog3BGhV0s2nODO2afCcSorJETcp4c=; b=DavFv3CdPl/kNo+u3HFsmgqFYd9L/621qFqbyYNHRHOsexBaXov2FwWOfQl/CYFEnq 2NkU5d07uaBoJGUK/Oc+zqI2sKAKwuTIXwL4M0b/Nzltjmhv1XPbz9RasO+aSRB7gr3y a8t8cIAX9xUqfcFJr0Jv2KvWSRukwKbizPMfA= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=FgVU1aFlDqzlqzitdp6WZMmwknV4CFzoq5eRBXOX+SjJ/6nbtYQtfU1zV8x2uBecv6 evbvTNcLtZdWtq7xClfCXhN6ZeAAYEniar93ZRaX/wcMV5yGASML54vXnboi0YtsU6sq ITiU0r4na11lDgNZ/d2LFg2XtIOZ5g18nzm2g= MIME-Version: 1.0 Received: by 10.239.139.209 with SMTP id u17mr469261hbu.79.1250613600330; Tue, 18 Aug 2009 09:40:00 -0700 (PDT) Date: Tue, 18 Aug 2009 12:40:00 -0400 Message-ID: <1ab24f410908180940v2b3ecbe3yd90b9c253173f302@mail.gmail.com> Subject: Swirl pots (soap) From: Lynn Hanover To: flyrotary@lancaironline.net Content-Type: multipart/alternative; boundary=001485f276a46623c804716d2b05 --001485f276a46623c804716d2b05 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit I believe adding dish soap or water wetter is supposed to reduce surface tension between coolant and block. What is the measured net benefit of either additive? 1%-5% improved cooling? Jeff The temperature differential between the radiator tubes and the coolant tend to cause detris to collect on the tube surface, and insulate the tube from the coolant. So, the radiator never performs as well as it will the first week you run it. Also, cooler coolant tends to cling to the tube, and hotter coolant tends to flow down the center of the tube. Good radiators have dents or creases criss crossing on the tube walls to improve turbulance in the coolant in an effort to keep the insulating cooler water off of the tube walls and improve overall cooling performance. The surfactants help move the coolant, by destroying the surface tension of the water. Why this works escapes me. But more slippery does sound better, right? The added benifit is a cleaner radiator tube and block interior. That has to help as well. The down side is that those same surficants can foam the coolant should coolant levels be come very low. If you stop by the radiator shop and look at some old cores you will use wetting agent and distilled water in your engine. It is too often the case that just a few more seconds of engine power, makes the difference between a really great airplane story, and a very sad airplane story. Lynn E. Hanover --001485f276a46623c804716d2b05 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

I believe adding dish soap= or water wetter is supposed to reduce surface tension between coolant and = block.

What is the measured net b= enefit of either additive? 1%-5% improved cooling?

Jeff
=A0
The temperature differen= tial between the radiator tubes and the coolant tend to cause detris to col= lect on the tube surface, and insulate the tube from the coolant. So, the r= adiator never performs as well as it will the first week you run it. Also, = cooler coolant tends to cling to the tube, and hotter coolant tends to flow= down the center of the tube.
=A0
Good radiators have dent= s or creases criss crossing on the tube walls to improve turbulance in the = coolant in an effort to keep the insulating cooler water off of the tube wa= lls and improve overall cooling performance. The surfactants help move the = coolant, by destroying the surface tension of the water.=A0Why this works e= scapes me. But more slippery does sound better, right?
=A0
The added benifit is a c= leaner radiator tube and block interior. That has to help as well.=A0
=A0
The down side is that th= ose same surficants can foam the coolant should coolant levels be come very= low.=A0
=A0
If you stop by the radia= tor shop and look at some old cores you will use=A0wetting agent =A0and dis= tilled water in your engine.=A0
=A0
It is too often the case= that just a few more seconds of engine power, makes the difference between= a really great airplane story, and a very sad airplane story.=A0
=A0
Lynn E. Hanover=A0
=A0
=A0=A0=A0
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