Return-Path: Received: from mail.tsisp.com ([65.23.108.44] verified) by logan.com (CommuniGate Pro SMTP 4.2.1) with ESMTP-TLS id 401080 for flyrotary@lancaironline.net; Tue, 07 Sep 2004 16:03:11 -0400 Received-SPF: none receiver=logan.com; client-ip=65.23.108.44; envelope-from=steve@tsisp.com Received: from stevehome by mail.tsisp.com (Technical Support Inc.) with SMTP id CQA74584 for ; Tue, 07 Sep 2004 16:02:40 -0400 Reply-To: From: "Steve Brooks" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Photos of Core tanks internals Date: Tue, 7 Sep 2004 16:04:51 -0400 Message-ID: <008c01c49515$f00b22d0$6400a8c0@WORKGROUP.local> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook CWS, Build 9.0.2416 (9.0.2910.0) Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Ed. These photos are great. It sure clears up allot of questions that I had about the construction of them. I pulled my cores out of the plane on the way home today, and drilled out the obstruction in one tank on each core. It was very thin material, and drilled out very easily. The thickness of the blocking plates were probably about the thickness of a soda can, and drilled out about as easily. I'll re-installed them tomorrow, and see if I now get good circulation. I'll also have to refill and bleed the cooling system again. I'm keeping my fingers crossed Regards, Steve Brooks -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson Sent: Tuesday, September 07, 2004 12:39 PM To: Rotary motors in aircraft Subject: [FlyRotary] Photos of Core tanks internals << File: MVC-021S.JPG >> << File: MVC-019S.JPG >> << File: MVC-020S.JPG >> << File: ATT00131.txt >> Well, David, I just went down to the shop through the pouring remnants of Frances and cut open each side tank of a core I had taken from the junkyard years ago. The photos are attached and speak for themselves - no dividers or other impediments to coolant flow in the tanks - pretty clean channel from top to bottom. Each "row" has 5 approx 1/8" (perhaps slightly larger) dia holes that conduct the water through the core to the opposite side tank. So 14 rows * 5 * area of 1/8-3/16" dia hole would give a cross flow channel area of around 0.86 sq inches to 1.93 sq inches - probably toward the larger figure. So as Bill suggested they may have redesigned the heat exchangers to take a different approach to recondensing the refrigerant calling for the divider plate. Given the relatively small cross channels, it is my opinion that a serpentine cooler is probably offering considerably more resistance to flow. Some of the radiator shop webpages give an estimate of the increase in flow resistance of a Serpentine core over the straight through - as best I recall it was something like 4 times as best I recall. So, its clear that not all GM evaporator cores are created the same way. This one was from the an late 80s early 90s Cadillac. I looked all over for some identifying model number but could not find anything. I do recall it had a yellow sticker with a black C on it when I yanked it. In any case, it looks like we can not simply order just any GM cooler core. I suspect that when they switched over to the more environmental friendly refrigerant then there could have been some redesign of the core, but just speculation on my part. Here's the photos Ed. Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message ----- From: "David Carter" To: "Rotary motors in aircraft" Sent: Tuesday, September 07, 2004 11:55 AM Subject: [FlyRotary] Re: Water pump problem > Thanks, Ed. > > I wonder Steve Brooks's core with a "plate" is different from the > GM/Harrison cores that I have (Chev'y Caprice). > - When I probed my core last night and found no plates in the end cap > with the larger of the two welded tubes, I DIDN'T check the other side - > those smaller 1/2" OD tubes turn 90 degrees and run about a foot, so I never > probed that side. That is the side that has the little "filter" and/or > "expansion jet" thing sitting about an inch down inside. Perhaps there's a > plate on that side that matches what has been discussed recently. > > If Steve's core is a typical GM/Harrison core, then I'd like to understand > more about which end "the plate" is in and tell us more about "the tube that > was removed". I've not yet cut into any of my cores to mod the fittings, so > am ignorant of the insides. > > David > > ----- Original Message ----- > From: "Ed Anderson" > To: "Rotary motors in aircraft" > Sent: Tuesday, September 07, 2004 6:54 AM > Subject: [FlyRotary] Re: Water pump problem > > > > Hey, David, not to worry. We have all hit the "Send" button on an e mail > or > > two and later wondered why we did. {:>) > > > > Ed > > > > Ed Anderson > > RV-6A N494BW Rotary Powered > > Matthews, NC > > > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html >