X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [199.185.220.223] (HELO priv-edtnes51.telusplanet.net) by logan.com (CommuniGate Pro SMTP 5.0.4) with ESMTP id 887892 for flyrotary@lancaironline.net; Mon, 19 Dec 2005 01:00:05 -0500 Received-SPF: pass receiver=logan.com; client-ip=199.185.220.223; envelope-from=haywire@telus.net Received: from Endurance ([154.20.245.217]) by priv-edtnes51.telusplanet.net (InterMail vM.6.01.04.04 201-2131-118-104-20050224) with SMTP id <20051219055920.HUEI3272.priv-edtnes51.telusplanet.net@Endurance> for ; Sun, 18 Dec 2005 22:59:20 -0700 From: "Todd Bartrim" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Heat exchangers Date: Sun, 18 Dec 2005 21:59:15 -0800 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D0_01C6041E.49950230" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_00D0_01C6041E.49950230 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Hi Monty; I'm using the Ford cores and I did just what you are thinking. I drilled through the baffles with a 7/8" bit. Common wisdom seems to say that the GM cores flow better than the Fords, but I believe that is because someone cut one open at sometime and said "that can't flow enough", and concluded that further testing was not needed. (sorta like someone's official test of the EWP). I did some actual flow tests of the 2 different types using an EWP and a mag tube flowmeter and found slightly better flow with the Ford cores. (the full report can be found in the archives). I believe I blew out the metal shavings using compressed air and it took a little effort. Todd A gold mine of info. Actually after re-reading and looking at Ed's pics of his evap cores with the tanks cut off, I have decided the Ford units are perfect. They just need the baffles drilled out. Instead of having 5 holes, they have a slot all the way across with turbulator fins between the plates. I will post a pic tomorrow, to tired tonight. ------=_NextPart_000_00D0_01C6041E.49950230 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi=20 Monty;

I'm using the Ford cores and I did just what = you are=20 thinking. I drilled through the baffles with a 7/8" bit. Common wisdom = seems to=20 say that the GM cores flow better than the Fords, but I believe that is = because=20 someone cut one open at sometime and said "that can't flow enough",=20 and concluded that further testing was not needed. (sorta like = someone's official test of the EWP). I did some actual flow tests of the = 2=20 different types using an EWP and a mag tube flowmeter and found slightly = better=20 flow with the Ford cores. (the full report can be found in the=20 archives).

I believe I blew out the metal shavings using = compressed=20 air and it took a little effort.

Todd

A gold mine of info. Actually after = re-reading=20 and looking at Ed's pics of his evap cores with the tanks cut off, I = have=20 decided the Ford units are perfect. They just need the baffles drilled = out.=20 Instead of having 5 holes, they have a slot all the way across with = turbulator=20 fins between the plates. I will post a pic tomorrow, to tired tonight. =

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