X-Virus-Scanned: clean according to Sophos on Logan.com From: "Steven W. Boese" Received: from [207.46.100.110] (HELO na01-by2-obe.outbound.protection.outlook.com) by logan.com (CommuniGate Pro SMTP 6.1c2) with ESMTPS id 7444732 for flyrotary@lancaironline.net; Thu, 29 Jan 2015 14:39:26 -0500 Received-SPF: none receiver=logan.com; client-ip=207.46.100.110; envelope-from=SBoese@uwyo.edu Received: from BN3PR0501MB1138.namprd05.prod.outlook.com (25.160.113.148) by BN3PR0501MB1137.namprd05.prod.outlook.com (25.160.113.147) with Microsoft SMTP Server (TLS) id 15.1.65.19; Thu, 29 Jan 2015 19:38:50 +0000 Received: from BN3PR0501MB1138.namprd05.prod.outlook.com ([25.160.113.148]) by BN3PR0501MB1138.namprd05.prod.outlook.com ([25.160.113.148]) with mapi id 15.01.0065.013; Thu, 29 Jan 2015 19:38:50 +0000 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: swirl / expansion tank configuration Thread-Topic: [FlyRotary] Re: swirl / expansion tank configuration Thread-Index: AQHQO/S8bAUmnanLcEyOXRFsalBMrJzXecQ+ Date: Thu, 29 Jan 2015 19:38:50 +0000 Message-ID: <1422560331877.21393@uwyo.edu> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [69.146.103.188] authentication-results: lancaironline.net; dkim=none (message not signed) header.d=none;lancaironline.net; dmarc=none action=none header.from=uwyo.edu; x-dmarcaction-test: None x-microsoft-antispam: BCL:0;PCL:0;RULEID:(3005004);SRVR:BN3PR0501MB1137; x-exchange-antispam-report-test: UriScan:; x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:;SRVR:BN3PR0501MB1137; x-forefront-prvs: 0471B73328 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(6009001)(377454003)(107886001)(450100001)(88552001)(77156002)(46102003)(19627405001)(87936001)(117636001)(36756003)(19625215002)(75432002)(89122001)(62966003)(99286002)(102836002)(2950100001)(2900100001)(106116001)(110136001)(92566002)(16236675004)(19580405001)(86362001)(76176999)(90282001)(40100003)(122556002)(66066001)(2656002)(19580395003)(54356999)(50986999)(80792004)(19607625011);DIR:OUT;SFP:1102;SCL:1;SRVR:BN3PR0501MB1137;H:BN3PR0501MB1138.namprd05.prod.outlook.com;FPR:;SPF:None;MLV:sfv;LANG:en; Content-Type: multipart/alternative; boundary="_000_142256033187721393uwyoedu_" MIME-Version: 1.0 X-OriginatorOrg: uwyo.edu X-MS-Exchange-CrossTenant-originalarrivaltime: 29 Jan 2015 19:38:50.1371 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: f9cdd7ad-825d-4601-8e9c-a325e02d52da X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN3PR0501MB1137 --_000_142256033187721393uwyoedu_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ?Jeff, In my system, the outlet of the water pump (high pressure and coolant high = level) is connected to the expansion tank at a location a couple of inches = from the bottom of the tank. The inlet of the water pump (low pressure and= low coolant level) is connected to the bottom of the expansion tank. Both= connections to the coolant tank are below the coolant level in the tank at= all times. With the engine not running, the expansion tank does not back-= fill with coolant even if the expansion tank filler cap is removed. In my = system, the expansion tank cannot back-fill unless the volume of the coolan= t in the rest of the system is increased (by thermal expansion for example)= or air is introduced into that part of the system. Steve ________________________________ From: Rotary motors in aircraft on behalf of = Jeff Whaley Sent: Thursday, January 29, 2015 11:50 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: swirl / expansion tank configuration Steve, nothing wrong with connecting both hoses to bottom of expansion tank= as you indicate; however, it's the connection points to the engine block t= hat are important here. If the other end of one hose is connected to a low= -point in the system the expansion tank will back-fill with coolant - that = is in the static condition: engine not running, pressure cap on expansion t= ank removed and system not pressurized. One connection should remove steam= from block; the other connection goes to top of water pump not the bottom.= That is how my system is connected and I think yours is too. System pre= ssurizes in relationship to coolant temperature; I use a 16 lb cap on my ex= pansion tank (not lowest point either) typical cruising pressure will be 8-= 12 psi. Jeff --_000_142256033187721393uwyoedu_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

​Jeff,


In my system, the outlet of the water pump (high pressure and coolant hi= gh level) is connected to the expansion tank at a location a couple of= inches from the bottom of the tank.  The inlet of the water pump (low= pressure and low coolant level) is connected to the bottom of the expansion tank.  Both connections to the coolant= tank are below the coolant level in the tank at all times.  With the = engine not running, the expansion tank does not back-fill with coolant even= if the expansion tank filler cap is removed.  In my system, the expansion tank cannot back-fill unless the volume of the= coolant in the rest of the system is increased (by thermal expansion for e= xample) or air is introduced into that part of the system.


Steve 

From: Rotary motors in ai= rcraft <flyrotary@lancaironline.net> on behalf of Jeff Whaley <fly= rotary@lancaironline.net>
Sent: Thursday, January 29, 2015 11:50 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: swirl / expansion tank configuration
 

Steve, nothing wrong with connecting both hoses to b= ottom of expansion tank as you indicate; however, it’s the connection= points to the engine block that are important here.  If the other end= of one hose is connected to a low-point in the system the expansion tank will back-fill with coolant - that is in the sta= tic condition: engine not running, pressure cap on expansion tank removed a= nd system not pressurized.  One connection should remove steam from bl= ock; the other connection goes to top of water pump not the bottom.  That is how my system is connected and= I think yours is too.   System pressurizes in relationship to co= olant temperature; I use a 16 lb cap on my expansion tank (not lowest point= either) typical cruising pressure will be 8-12 psi.

Jeff

 

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