Return-Path: Received: from fed1rmmtao11.cox.net ([68.230.241.28] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3154636 for flyrotary@lancaironline.net; Fri, 09 Apr 2004 11:52:44 -0400 Received: from Leonards ([68.111.228.182]) by fed1rmmtao11.cox.net (InterMail vM.6.01.03.02 201-2131-111-104-20040324) with ESMTP id <20040409155243.IGH15011.fed1rmmtao11.cox.net@Leonards> for ; Fri, 9 Apr 2004 11:52:43 -0400 From: "David Leonard" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Dave's pump problems Date: Fri, 9 Apr 2004 08:52:46 -0700 Message-ID: <001801c41e4a$b407cdc0$b6e46f44@Leonards> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0019_01C41E10.07A8F5C0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.3416 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0019_01C41E10.07A8F5C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Thanks, Al. I do have a vent at the pump outlet for filling the engine. It is simply a 8-32 screw tapped into the aluminum at the highest point. Works well to get the pocket of air out. There is a cap on the surge tank but it should allow for expansion. Please see my drawings in the next post. Thanks. David Leonard The Rotary Roster: http://members.aol.com/_ht_a/rotaryroster/index.html -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen Sent: Thursday, April 08, 2004 9:24 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Dave's pump problems > MessageThis may have already been suggested, but where did you run the block vent from the top of flywheel end of engine? Should be connected to high point of cooling system. > > Tracy > That vent is my only vent from the system. It goes to a small surge can with a 16 psi cap which vent to 2 larger pressurized cans on the firewall. Dave Leonard Unless I misunderstand (I remember this happening once :-)) this is like no vent at all; unless the cap is off the surge tank. Yeah, I know you know that, but we're kind of out in space here trying to figure something out. It seems that without a vent at the exit from the pump there will be some air trapped in the pump - no? A nice way to put in a vent at the pump outlet is to install an AN plug with an o-ring seal. Drill into the bottom of the plug, and then right angle to the side just below the o-ring. Back off the plug a couple of turns when you fill to bleed air, tighten it down to run. (Photo attached) I have a second one that has a shrader (sp?) valve welded into it so if I need to pressure test the system, I can just swap plugs. Al ------=_NextPart_000_0019_01C41E10.07A8F5C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Thanks, Al.  I do have a vent at the pump outlet for = filling the engine.  It is simply a 8-32 screw tapped into the aluminum =  at the highest point.  Works well to get the pocket of air out. =  There is a cap on the surge tank but it should allow for expansion.  Please see my = drawings in the next post.  Thanks.

 

David Leonard

The Rotary = Roster:

http://memb= ers.aol.com/_ht_a/rotaryroster/index.html

-----Original Message-----
From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen
Sent: Thursday, April 08, = 2004 9:24 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = Dave's pump problems

 

> MessageThis may have already been suggested, but where did you run the = block vent from the top of flywheel end of engine?  Should be connected = to high point of cooling system.

>

> Tracy

>

 

That vent is my only vent from the system.  It goes to a small surge can = with a 16 psi cap which vent to 2 larger pressurized cans on the = firewall.

 

Dave Leonard

 

Unless I misunderstand (I remember this happening = once J) this is like no = vent at all; unless the cap is off the surge tank.  Yeah, I know you know that, = but we’re kind of out in space here trying to figure something = out.  It seems that without a vent at the exit from the pump there will be some = air trapped in the pump – no?  

 

A nice way to put in a vent at the pump outlet is = to install an AN plug with an o-ring seal.  Drill into the bottom of = the plug, and then right angle to the side just below the o-ring.  Back = off the plug a couple of turns when you fill to bleed air, tighten it down = to run.  (Photo attached)  I have a second one that has a shrader = (sp?) valve welded into it so if I need to pressure test the system, I can = just swap plugs.

 

Al

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