Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 548955 for flyrotary@lancaironline.net; Sun, 28 Nov 2004 22:24:47 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-069-132-109-019.carolina.rr.com [69.132.109.19]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id iAT3OEkd013504 for ; Sun, 28 Nov 2004 22:24:15 -0500 (EST) Message-ID: <000801c4d5c2$ec894f90$2502a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Another precautionary landing Date: Sun, 28 Nov 2004 22:24:23 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine ----- Original Message ----- From: "John Slade" To: "Rotary motors in aircraft" Sent: Sunday, November 28, 2004 10:07 PM Subject: [FlyRotary] Re: Another precautionary landing > I've just had a thought. What if I reconnected the oil pipes to the coolers > the wrong way around. That would cause a restriction, wouldn't it? The oil > comes OUT of the front housing near the alternator pulley, then into one > cooler, on to the other cooler, then back to the filter block at the back > (pusher) of the engine. The [stock 3rd gen] oil coolers have a thermostat > type device on one port. Is that the in port or the out port? > John (starting to think positive already) > > Certainly a possibility to consider. However, with my 2nd gen oil cooler, it will operate with oil coming in the wrong way - I know because that is how mine is currently connected. It turns out the oil thermostat is a by-pass type. When the oil is cold the thermostat opens and by passes some of the oil cooler channels. When the oil temps increase the thermostat closes and forces all the oil through the cooler. So while the thermostat might not open at the expected temperature point if installed backwards, once it does close all of the oil is forced through the cooler. I would presume that if the thermostat was defective and does not ever shut then you could have some of the oil by-passing the cooler fins. OR it there is no thermostat in the cooler you would have continuos by-passing of the oil cooler (for some of the oil). Ed Anderson