X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [66.219.56.248] (HELO qnsi-xch.qnsi.net) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2364843 for flyrotary@lancaironline.net; Tue, 02 Oct 2007 16:54:27 -0400 Received-SPF: none receiver=logan.com; client-ip=66.219.56.248; envelope-from=bhughes@qnsi.net Content-class: urn:content-classes:message Return-Receipt-To: "Bobby J. Hughes" MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C8053F.2C1D37D0" Disposition-Notification-To: "Bobby J. Hughes" X-MimeOLE: Produced By Microsoft Exchange V6.5.6944.0 Subject: RE: [FlyRotary] Coolant Water Pressure Date: Tue, 2 Oct 2007 15:57:05 -0600 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Coolant Water Pressure Thread-Index: AcgFG5hwbho2hDUCS3GulW2g3rV32AAIz/rQ From: "Bobby J. Hughes" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C8053F.2C1D37D0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Bill, =20 When you modified the thermostat housing did you plug the bypass? =20 Bobby ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Bradburry Sent: Tuesday, October 02, 2007 10:39 AM To: Rotary motors in aircraft Subject: [FlyRotary] Coolant Water Pressure=20 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??? =20 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??=20 =20 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?? =20 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. =20 Thanks, Bill B ------_=_NextPart_001_01C8053F.2C1D37D0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Bill,

When you modified the thermostat housing did = you plug the=20 bypass?

Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Bill=20 Bradburry
Sent: Tuesday, October 02, 2007 10:39 = AM
To:=20 Rotary motors in aircraft
Subject: [FlyRotary] Coolant Water = Pressure=20

I just recently got my = Renesis=20 started again after finishing my cowl. I seem to be getting very = high=20 coolant pressures. I can only run the engine about 10-15 minutes = before=20 hitting the redline at 210*. My water pressure is at 27 Lbs at = that=20 time. I only have a 22 Lb radiator cap, so I assume that I am = blowing into=20 the recovery tank, but I have not confirmed that. My oil temp has = never=20 exceeded about 165*. It might have gone higher if I could have run = longer???

This whole water pressure = thing has=20 me a little baffled. Since this is a closed system and the only = way=20 pressure can build is due to the expansion of the coolant after = heating???, I am=20 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=20 time, then go to zero. It seems to me that the pressure should = correlate=20 to the temp pretty closely since it is a closed system??=20

Can someone enlighten me a = little on=20 the science of this pressure? It seems to me that there could be = some=20 pressure build up on the positive side of the pump, but it would go = negative on=20 the suction side, so the net effect of the pump should be close to=20 zero??

Also, my Renesis had only = 1800 miles=20 on it when I bought it, so I did not have to tear it down. As a = result, I=20 am somewhat in the dark as to how the water flows through the = system. =20 Could someone help me with that? I had to remove the thermostat = tower for=20 height clearance , so I made an adapter plate that takes water from the = top=20 outlet of the pump and sends it to the radiator (double pass), then from = the=20 radiator, it returns to the lower inlet of the=20 pump.

Thanks,

Bill=20 B

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