X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mx2.magma.ca ([206.191.0.250] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTPS id 989535 for flyrotary@lancaironline.net; Wed, 08 Jun 2005 23:17:01 -0400 Received-SPF: none receiver=logan.com; client-ip=206.191.0.250; envelope-from=ianddsl@magma.ca Received: from mail1.magma.ca (mail1.magma.ca [206.191.0.252]) by mx2.magma.ca (8.13.0/8.13.0) with ESMTP id j593GDDv005553 for ; Wed, 8 Jun 2005 23:16:14 -0400 Received: from binky (ottawa-hs-64-26-156-111.s-ip.magma.ca [64.26.156.111]) by mail1.magma.ca (8.13.0/8.13.0) with SMTP id j593GBwm007999 for ; Wed, 8 Jun 2005 23:16:13 -0400 Reply-To: From: "Ian Dewhirst" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: coolant leak Date: Wed, 8 Jun 2005 23:16:11 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001E_01C56C80.0F6491B0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.6604 (9.0.2911.0) 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_001E_01C56C80.0F6491B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Sorry did not finish that before I hit enter. As you rotate past the intake port the compression chamber pressure goes from 0 to over a hundred psi, once the plug fires the pressure skyrockets due to combustion. If you have a leak just past the intake port then your coolant system might see a pressure of 4 or 6 psi. If the leak occurs just before the plugs then you have a pulse of 100 psi potentially, if the leak occurs 40 degrees after the plugs fire you have the potential for a great deal of pressure pulsed to the cooling system. In a piston engine you see maximum combustion pressure when you have a leak, it is much easier to recognize. -- Ian -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Ian Dewhirst Sent: Wednesday, June 08, 2005 11:10 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: coolant leak Hi David, I really really think that a cooling system that consumes coolant is leaking it somewhere, either venting water vapor to the atmosphere or leaking. I don't follow how your coolant level can be going down and yet you still have residual pressure, shouldn't the pressure drop to zero as the coolant is consumed over time? A rotary is unique in that depending on where an o-ring failure occurs relative to the intake port you can end up with a little problem or a big problem. As you rotate past the intake port the compression chamber pressure goes from 0 to over a hundred PSI, once the plug fires the pressure skyrockets due to combustion. -- Ian If I were getting combustion pressure in my cooling system I think I would be boiling off my coolant PDQ. But I find that it only drops very slowly, about like in my car. But now I understand how Ed discovered his problem. -- Dave Leonard Turbo Rotary RV-6 N4VY http://members.aol.com/_ht_a/rotaryroster/index.html http://members.aol.com/vp4skydoc/index.html ------=_NextPart_000_001E_01C56C80.0F6491B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Sorry=20 did not finish that before I hit enter.
 
As you=20 rotate past the intake port the compression chamber pressure goes from 0 = to over a hundred psi,  once the plug fires = the pressure=20 skyrockets due to combustion.  If you have a leak just past the = intake port=20 then your coolant system might see a pressure of 4 or 6 psi.  = If the=20 leak occurs just before the plugs then you have a pulse of 100 psi = potentially,=20 if the leak occurs 40 degrees after the plugs fire you have the = potential=20 for a great deal of pressure pulsed to the cooling=20 system.
 
In a=20 piston engine you see maximum combustion pressure when you have a leak, = it is=20 much easier to recognize.
 
--=20 Ian
 
 
 
 
 
 -----Original = Message-----
From:=20 Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On = Behalf Of=20 Ian Dewhirst
Sent: Wednesday, June 08, 2005 11:10 = PM
To:=20 Rotary motors in aircraft
Subject: [FlyRotary] Re: coolant=20 leak

Hi=20 David,
 
I=20 really really think that a cooling system that consumes coolant = is=20 leaking it somewhere, either venting water vapor to the = atmosphere or=20 leaking.  I don't follow how your coolant = level can=20 be going down and yet you still have residual=20 pressure, shouldn't the pressure drop to zero as the=20 coolant is consumed over time?  
 
A=20 rotary is unique in that depending on where an o-ring failure = occurs=20 relative to the intake port you can end up with a little = problem or=20 a big problem.  As you rotate past the intake port the = compression=20 chamber pressure goes from 0 to over a hundred = PSI,  once the=20 plug fires the pressure skyrockets due to combustion.=20
 
--=20 Ian
If I were getting combustion pressure in my cooling system I = think I=20 would be boiling off my coolant PDQ.  But I find that it only = drops=20 very slowly, about like in my car.
 
But now I understand how Ed discovered his problem.

-- =
Dave=20 Leonard
Turbo Rotary RV-6 N4VY
http://memb= ers.aol.com/_ht_a/rotaryroster/index.html=20
http://members.aol.c= om/vp4skydoc/index.html=20
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