Return-Path: Received: from [65.54.168.107] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3070609 for flyrotary@lancaironline.net; Tue, 09 Mar 2004 11:06:28 -0500 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Tue, 9 Mar 2004 08:06:27 -0800 Received: from 64.159.104.104 by bay3-dav3.bay3.hotmail.com with DAV; Tue, 09 Mar 2004 16:06:27 +0000 X-Originating-IP: [64.159.104.104] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: air pocket in cooling system Date: Tue, 9 Mar 2004 11:06:22 -0500 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0000_01C405C6.8EA99B40" Message-ID: X-OriginalArrivalTime: 09 Mar 2004 16:06:28.0003 (UTC) FILETIME=[7A940F30:01C405F0] ------=_NextPart_001_0000_01C405C6.8EA99B40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable My guess is that the air was forced out of the loop and was then whipped = into foam by the pump. When you shut down the system, all the little bub= bles rise to the top of the system (the loop) and again form the air pock= et. =20 Again, think "firehose" when envisioning the coolant flow. Tracy ----- Original Message ----- From: Russell Duffy Sent: Tuesday, March 09, 2004 10:13 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: air pocket in cooling system Hi Paul, Can you post another pic of this thermostat housing area, with the temp sensor visible? Are you saying the stock temp sensor is above the thermostat? The water pump housings that I have, locate the temp sensor below the thermostat, which would be immersed in coolant if the level is = up to the bottom of the thermostat as you described. Is there any chance th= is higher fitting you describe was originally a level sensor? As for air pockets, my rev-1 system had a pretty big loop of AN-16 hose o= ut of the top of the thermostat housing, that went all the way down to the radiator below the engine. That loop stayed full of air all the time. = I figured that there wasn't enough flow to force the air pocket down the lo= ng slope and into the radiator. It seems the hose was large enough to allow the water to flow along the bottom of the hose, and leave the air in the top. It didn't hurt anything, but it always bugged me. In rev-2, I did away with the air separator tank, and have only an overfl= ow bottle. The rad cap is mounted on the thermostat housing (no room for a thermostat though), so I can actually fill the engine without taking hose= s off (another improvement from rev-1). I have the option of adding an aluminum, pressurized expansion tank in place of the plastic overflow tan= k if it proves necessary, but for now, I decided that simple is good. Cheers, Rusty (running again by the end of this week...really...don't laugh, it could happen) =20 >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_001_0000_01C405C6.8EA99B40 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

My guess is th= at the air was forced out of the loop and was then whipped into foam by t= he pump. When you shut down the system, all the little bubbles rise= to the top of the system (the loop) and again form the air pocket. =

Again, think "firehose" when envisioning t= he coolant flow.

Tracy

----- Original Message -----

From: Russell Duff= y

Sent: Tuesday, March 09, 2= 004 10:13 AM

To: Rotary moto= rs in aircraft

Subject: [Fly= Rotary] Re: air pocket in cooling system

Hi Paul,<= BR>
Can you post another pic of this thermostat housing area, with the= temp
sensor visible? Are you saying the stock temp sensor is ab= ove the
thermostat? The water pump housings that I have, locate = the temp sensor
below the thermostat, which would be immersed in coola= nt if the level is up
to the bottom of the thermostat as you described= Is there any chance this
higher fitting you describe was origi= nally a level sensor?

As for air pockets, my rev-1 system had a pr= etty big loop of AN-16 hose out
of the top of the thermostat housing, = that went all the way down to the
radiator below the engine. Tha= t loop stayed full of air all the time.   I
figured that the= re wasn't enough flow to force the air pocket down the long
slope and = into the radiator. It seems the hose was large enough to allow
t= he water to flow along the bottom of the hose, and leave the air in thetop. It didn't hurt anything, but it always bugged me.

In = rev-2, I did away with the air separator tank, and have only an overflow<= BR>bottle. The rad cap is mounted on the thermostat housing (no roo= m for a
thermostat though), so I can actually fill the engine without = taking hoses
off (another improvement from rev-1). I have the op= tion of adding an
aluminum, pressurized expansion tank in place of the= plastic overflow tank
if it proves necessary, but for now, I decided = that simple is good.

Cheers,
Rusty (running again by the end of= this week...really...don't laugh, it
could happen)

>> Homepage: http://www.flyrotary.com/
>>= ; Archive:   http://lancaironline.net/lists/flyrotary/Lis= t.html

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