Return-Path: Received: from fed1rmmtao03.cox.net ([68.230.241.36] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 526093 for flyrotary@lancaironline.net; Wed, 10 Nov 2004 10:33:05 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.36; envelope-from=ALVentures@cox.net Received: from BigAl ([68.107.116.221]) by fed1rmmtao03.cox.net (InterMail vM.6.01.04.00 201-2131-117-20041022) with ESMTP id <20041110153235.IVZI21104.fed1rmmtao03.cox.net@BigAl> for ; Wed, 10 Nov 2004 10:32:35 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: EWP Date: Wed, 10 Nov 2004 07:32:35 -0800 Message-ID: <000001c4c73a$81267bb0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4C6F7.730585A0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C4C6F7.730585A0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Al, In the attached picture, the 20B impeller (right) is .170" larger diameter than the 13B (left). Note that the 13B in the picture is from an '89 n/a engine. Not sure if 3rd gen or Cosmo impellers are the same size as the 20B. No idea how much more coolant the 20B pump will flow than the smaller 13B pump. Just a data point in case you have cooling issues. Mark Mark; My opinion would be that the .17 difference in diameter is negligible compared to other differences in the design (shape of housing exit flow, clearances, etc.) Al ------=_NextPart_000_0001_01C4C6F7.730585A0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

Al,
In the attached picture, the 20B impeller (right) is .170" larger = diameter than the 13B (left).  Note that the 13B in the picture is from an = '89 n/a engine.  Not sure if 3rd gen or Cosmo impellers are the same size = as the 20B.  No idea how much more coolant the 20B pump will flow than the smaller 13B pump.  Just a data point in case you have cooling = issues.
Mark 

Mark;

 

My opinion would be that the .17 difference in diameter is negligible compared to other differences in = the design (shape of housing exit flow, clearances, etc.)

 

Al

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