Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Fri, 20 Dec 2002 08:13:46 -0500 Message-ID: X-Original-Return-Path: Received: from [24.201.245.36] (HELO VL-MS-MR004.sc1.videotron.ca) by logan.com (CommuniGate Pro SMTP 4.0.2) with ESMTP id 1931428 for flyrotary@lancaironline.net; Fri, 20 Dec 2002 06:23:04 -0500 Received: from i9e3g2 ([207.253.57.81]) by VL-MS-MR004.sc1.videotron.ca (iPlanet Messaging Server 5.2 HotFix 0.9 (built Jul 29 2002)) with SMTP id <0H7F00BH60ZRAA@VL-MS-MR004.sc1.videotron.ca> for flyrotary@lancaironline.net; Fri, 20 Dec 2002 06:23:54 -0500 (EST) X-Original-Date: Fri, 20 Dec 2002 06:16:55 -0500 From: =?iso-8859-1?Q?g=E9raldine_berger-yvon_cournoyer?= Subject: Re: [FlyRotary] Re: water pressure X-Original-To: Rotary motors in aircraft X-Original-Message-id: <000d01c2a81a$1fcaddc0$4a07fea9@i9e3g2> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Mailer: Microsoft Outlook Express 6.00.2800.1106 Content-type: multipart/alternative; boundary="Boundary_(ID_5nahCR1b3cblCG6S2Wj8YQ)" X-Priority: 3 X-MSMail-priority: Normal References: This is a multi-part message in MIME format. --Boundary_(ID_5nahCR1b3cblCG6S2Wj8YQ) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: quoted-printable ----- Original Message -----=20 From: Peter Cowan=20 To: Rotary motors in aircraft=20 Sent: Wednesday, December 18, 2002 6:41 PM Subject: [FlyRotary] Re: water pressure Where is your pressure sender located, Peter? Pressure variations are bothering me too, but the engine keeps running = well Yvon. =20 It is near the pump output but I may try moving it to the plug used = for car heater line at the other end of the block. What variations do you see? Peter My engine is a 1986 13B. At first, I did not have a coolant pressure = gauge. My coolant temp sender was located in the coolant pump body close = to the thermostat. Once I had the air out of the system, it would = maintain pressure for long periods, several days and more. When I needed = to remove the pressure cap on top of the pump, coolant would burst out = under pressure, so there must have been some air left in there. Oil and = coolant temps had to be monitored at WOT climb but would stay close to = 200F at cruise. I have always used a thermostat and a ~one litre coolant = reservoir connected to the pressure cap. When cold it is ~one quarter = full. When hot, it is 9/10ths full. Also I have a canopy defroster which = takes hot coolant from the heater outlet in the rear housing and returns = the coolant to the pump near the thermostat.=20 Later, I moved the temp sensor to the rear housing where Mazda had its = temp sensor. Then I installed a coolant pressure guage and put the = pressure sensor in the front housing on the sparkplugs side. There is a = convenient threaded hole there for a pressure sensor. Then, I connected = the hot coolant outlet on top of the rear housing to the top of the = coolant pump body. So now, at ambient temperature, engine cold., there = is no pressure in the cooling system. I can remove the pressure cap and = loose only a few drops of coolant, negligible volume. When I start the = engine, the gauge shows no pressure for long minutes, 10 sometimes 15 = minutes. Coolant pressure appears to be proportional to engine rpm, but = I am still checking on that. The max coolant pressure I have seen is = about 10-12 psi at 5500 rpm. in cruise. Temperatures are lower, both at = WOT climb and cruise. Oil ~190F (I wonder if there is a temperature = regulating mechanism inside Mazda's oil cooler) and coolant ~180F. But = that may be due to colder weather. Cloudy and cold around here, at this = time of year. (Sherbrooke, Qu=E9bec.) The overflow bottle (coolant = reservoir) performs as it did before, so no worry there.=20 So, coolant temperature has come down and that is more important to me = than coolant pressure. We will see next summer if my cooling system is = really more efficient. So, I was hoping that the oil temperature would come down also to = about 170-180F. My Mazda oil cooler in installed upside down and I = wonder if that could impede its cooling function. MERRY CHRISMAS TO ALL! Yvon Cournoyer. Rotary Powered Zenair Zenith. (CH-200) =20 --Boundary_(ID_5nahCR1b3cblCG6S2Wj8YQ) Content-type: text/html; charset=iso-8859-1 Content-transfer-encoding: quoted-printable
 
----- Original Message -----
From:=20 Peter = Cowan=20
Sent: Wednesday, December 18, = 2002 6:41=20 PM
Subject: [FlyRotary] Re: water=20 pressure

Where is your pressure sender = located,=20 Peter?
Pressure variations are bothering me = too, but the=20 engine keeps running well
Yvon.   =20
 
It is near the pump output but I may = try moving=20 it to the plug used for car heater line at the other end of the=20 block.
 
What variations do you = see?
Peter
 
 
My engine is a 1986 13B. At first, I = did not have=20 a coolant pressure gauge. My coolant temp sender was located in the = coolant=20 pump body close to the thermostat. Once I had the air out of the = system, it=20 would maintain pressure for long periods, several days and more. When = I needed=20 to remove the pressure cap on top of the pump, coolant would burst out = under=20 pressure, so there must have been some air left in there. Oil and = coolant=20 temps had to be monitored at WOT climb but would stay close to 200F at = cruise.=20 I have always used a thermostat and a ~one litre coolant reservoir = connected=20 to the pressure cap. When cold it is ~one quarter full. When hot, it = is=20 9/10ths full. Also I have a canopy defroster which takes hot coolant = from the=20 heater outlet in the rear housing and returns the coolant to the pump = near the=20 thermostat. 
Later, I moved the temp sensor to the = rear=20 housing where Mazda had its temp sensor. Then I installed a = coolant=20 pressure guage and put the pressure sensor in the front housing = on the=20 sparkplugs side. There is a convenient threaded hole there for a = pressure=20 sensor. Then, I connected the hot coolant outlet on top of the = rear=20 housing to the top of the coolant pump body. So now, at ambient = temperature,=20 engine cold., there is no pressure in the cooling system. I can remove = the=20 pressure cap and loose only a few drops of coolant, negligible volume. = When I=20 start the engine, the gauge shows no pressure for long minutes, = 10=20 sometimes 15 minutes. Coolant pressure appears to be proportional to = engine=20 rpm, but I am still checking on that. The max coolant pressure I have = seen is=20 about 10-12 psi at 5500 rpm. in cruise. Temperatures are lower, = both at=20 WOT climb and cruise. Oil ~190F (I wonder if there is a temperature = regulating=20 mechanism inside Mazda's oil cooler) and coolant ~180F. But that = may be=20 due to colder weather. Cloudy and cold around here, at this = time of=20 year. (Sherbrooke, Qu=E9bec.) The overflow bottle (coolant reservoir) = performs=20 as it did before, so no worry there. 
So, coolant temperature has = come down and=20 that is more important to me than coolant pressure. We will see next = summer if=20 my cooling system is really more efficient.
So, I was hoping that the oil = temperature=20 would come down also to about 170-180F. My Mazda oil cooler = in=20 installed upside down and I wonder if that could impede its cooling=20 function.
 
MERRY CHRISMAS TO = ALL!
 
Yvon = Cournoyer.
Rotary Powered Zenair Zenith. = (CH-200)   
 
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