Return-Path: Sender: (Marvin Kaye) To: flyrotary@lancaironline.net Date: Sun, 28 Mar 2004 21:52:13 -0500 Message-ID: X-Original-Return-Path: Received: from fed1mtao01.cox.net ([68.6.19.244] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3132305 for flyrotary@lancaironline.net; Sun, 28 Mar 2004 21:20:02 -0500 Received: from smtp.west.cox.net ([172.18.180.57]) by fed1mtao01.cox.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with SMTP id <20040329022000.RAAX2477.fed1mtao01.cox.net@smtp.west.cox.net> for ; Sun, 28 Mar 2004 21:20:00 -0500 From: Dale Rogers X-Original-To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Water Pump (was: Renesis & RD-1c...) X-Original-Date: Sun, 28 Mar 2004 21:19:59 -0500 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=____1080526799941_DhEqU57QTn" X-Original-Message-Id: <20040329022000.RAAX2477.fed1mtao01.cox.net@smtp.west.cox.net> This is a multi-part message in MIME format. ------=____1080526799941_DhEqU57QTn Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Dave, The water pump turning backwards will _not_ move the water in reverse. It is not a positive displacement pump, and turning it in the wrong direction will only make the centrifugal action less efficient (and I believe more likely to cavitate) since the centrifugal force will be fighting a smaller tendancy of the vanes to force the water in toward the impeller center. The only time the vanes have any hope of winning is at _very_ low RPMs. Get the correct impeller for your rotation direction. >... So its either a broken shaft (but the pulley turns smoothly) > or something really strange (like the wrong impeller). ------=____1080526799941_DhEqU57QTn Content-Type: text/html; name="replyAll" Content-Disposition: inline; filename="replyAll"

Well, I went out to trouble shoot the cooling problem today. The thermostat relief passage was properly sealed by my welder. Just to shed some more light on the subject I decided to start the engine with the outlet hose disconnected. I ran the engine for 2 min. and not a drop of coolant came out the opening!!! No coolant flow whatsoever, nada, zip (the system was verifiably full of coolant, the pump drive was turning. So its either a broken shaft (but the pulley turns smoothly) or something really strange (like the wrong impeller). Unfortunately, since I have less than ¼ inch clearance to the firewall I really don’t think there will be any way to get the impeller off without removing the engine. Ahg.

David Leonard

The Rotary Roster:

http://members.aol.com/_ht_a/rotaryroster/index.html

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