X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [209.87.232.171] (HELO intldata.ca) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2364423 for flyrotary@lancaironline.net; Tue, 02 Oct 2007 13:17:28 -0400 Received-SPF: none receiver=logan.com; client-ip=209.87.232.171; envelope-from=jwhaley@intldata.ca Received: from jwhaley by intldata.ca (MDaemon PRO v9.6.1) with ESMTP id md50000060010.msg for ; Tue, 02 Oct 2007 13:12:41 -0400 From: "Jeff Whaley" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Coolant Water Pressure Date: Tue, 2 Oct 2007 13:12:49 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0036_01C804F5.EE90BA20" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 thread-index: AcgFEsOl46BfxdqjQEe1pnbaRRyH+gABKRrA In-Reply-To: X-Authenticated-Sender: jwhaley@intldata.ca X-Spam-Processed: intldata.ca, Tue, 02 Oct 2007 13:12:41 -0400 (not processed: message from trusted or authenticated source) X-MDRemoteIP: 172.16.11.17 X-Return-Path: jwhaley@intldata.ca X-Envelope-From: jwhaley@intldata.ca X-MDaemon-Deliver-To: flyrotary@lancaironline.net Reply-To: jwhaley@intldata.ca Message-ID: X-MDAV-Processed: intldata.ca, Tue, 02 Oct 2007 13:12:42 -0400 This is a multi-part message in MIME format. ------=_NextPart_000_0036_01C804F5.EE90BA20 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Bill, where are you measuring your pressure? If you measure in the block or at the pump outlet you'll get unusually high, false readings. With a 22 lb cap you can't actually achieve 27 psi, as the cap will burp it to the over flow and reduce the pressure. I suggest you measure the pressure from an expansion tank connected to the inlet side of the pump. The stock Mazda cap is only 13 lbs . there is no reason to see even 22 psi. JWW _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Bradburry Sent: Tuesday, October 02, 2007 12:39 PM To: Rotary motors in aircraft Subject: [FlyRotary] Coolant Water Pressure I just recently got my Renesis started again after finishing my cowl. I seem to be getting very high coolant pressures. I can only run the engine about 10-15 minutes before hitting the redline at 210*. My water pressure is at 27 Lbs at that time. I only have a 22 Lb radiator cap, so I assume that I am blowing into the recovery tank, but I have not confirmed that. My oil temp has never exceeded about 165*. It might have gone higher if I could have run longer??? This whole water pressure thing has me a little baffled. Since this is a closed system and the only way pressure can build is due to the expansion of the coolant after heating???, I am confused by some comments that have been made from time to time. I remember something that Tracy said about his pressure would build for a time, then go to zero. It seems to me that the pressure should correlate to the temp pretty closely since it is a closed system?? Can someone enlighten me a little on the science of this pressure? It seems to me that there could be some pressure build up on the positive side of the pump, but it would go negative on the suction side, so the net effect of the pump should be close to zero?? Also, my Renesis had only 1800 miles on it when I bought it, so I did not have to tear it down. As a result, I am somewhat in the dark as to how the water flows through the system. Could someone help me with that? I had to remove the thermostat tower for height clearance , so I made an adapter plate that takes water from the top outlet of the pump and sends it to the radiator (double pass), then from the radiator, it returns to the lower inlet of the pump. Thanks, Bill B __________ NOD32 2566 (20071002) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com ------=_NextPart_000_0036_01C804F5.EE90BA20 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Bill, where are you measuring your pressure? If you measure in the block or at the pump outlet you’ll = get unusually high, false readings.

With a 22 lb cap you can’t = actually achieve 27 psi, as the cap will burp it to the over flow and reduce the pressure.

I suggest you measure the pressure = from an expansion tank connected to the inlet side of the = pump.

The stock Mazda cap is only 13 lbs = … there is no reason to see even 22 psi.

JWW

 

 

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Bradburry
Sent: Tuesday, October = 02, 2007 12:39 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] = Coolant Water Pressure

 

I just recently got my Renesis started again after = finishing my cowl.  I seem to be getting very high coolant pressures.  I = can only run the engine about 10-15 minutes before hitting the redline at 210*.  My water pressure is at 27 Lbs at that time.  I only = have a 22 Lb radiator cap, so I assume that I am blowing into the recovery tank, = but I have not confirmed that.  My oil temp has never exceeded about = 165*.  It might have gone higher if I could have run = longer???

 

This whole water pressure thing has me a little baffled.  Since this is a closed system and the only way pressure = can build is due to the expansion of the coolant after heating???, I am = confused by some comments that have been made from time to time.  I remember = something that Tracy said about his pressure would build for a time, then go to zero.  It = seems to me that the pressure should correlate to the temp pretty closely since = it is a closed system??

 

Can someone enlighten me a little on the science of = this pressure?  It seems to me that there could be some pressure build = up on the positive side of the pump, but it would go negative on the suction = side, so the net effect of the pump should be close to = zero??

 

Also, my Renesis had only 1800 miles on it when I = bought it, so I did not have to tear it down.  As a result, I am somewhat in = the dark as to how the water flows through the system.  Could someone help = me with that?  I had to remove the thermostat tower for height clearance , = so I made an adapter plate that takes water from the top outlet of the pump = and sends it to the radiator (double pass), then from the radiator, it = returns to the lower inlet of the pump.

 

Thanks,

Bill B



__________ NOD32 2566 (20071002) Information __________

This message was checked by NOD32 antivirus system.
http://www.eset.com

------=_NextPart_000_0036_01C804F5.EE90BA20--