Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Sat, 21 Dec 2002 16:39:40 -0500 Message-ID: X-Original-Return-Path: Received: from bree.pipcom.com ([204.92.62.3] verified) by logan.com (CommuniGate Pro SMTP 4.0.2) with SMTP id 1931994 for flyrotary@lancaironline.net; Fri, 20 Dec 2002 23:35:06 -0500 Received: (qmail 14093 invoked from network); 21 Dec 2002 04:35:06 -0000 Received: from ras3-1.pipcom.com (HELO new) (204.92.62.133) by bree.pipcom.com with SMTP; 21 Dec 2002 04:35:06 -0000 X-Original-Message-ID: <006d01c2a8aa$1a8621e0$5ed9fea9@new> From: "Peter Cowan" X-Original-To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: water pressure X-Original-Date: Fri, 20 Dec 2002 23:26:49 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0043_01C2A87F.44FDEC80" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 This is a multi-part message in MIME format. ------=_NextPart_000_0043_01C2A87F.44FDEC80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 Thanks for the details Yvon. I believe there must be a thermostat in = the oil cooler. I have seen similar fluctuations in oil temp.=20 Peter ------=_NextPart_000_0043_01C2A87F.44FDEC80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

 
 
What variations do you = see?
Peter
 
 
My engine is a 1986 13B. At first, = I did not=20 have a coolant pressure gauge. My coolant temp sender was located in = the=20 coolant pump body close to the thermostat. Once I had the air out of = the=20 system, it would maintain pressure for long periods, several days = and more.=20 When I needed to remove the pressure cap on top of the pump, coolant = would=20 burst out under pressure, so there must have been some air left in = there.=20 Oil and coolant temps had to be monitored at WOT climb but would = stay close=20 to 200F at cruise. I have always used a thermostat and a ~one litre = coolant=20 reservoir connected to the pressure cap. When cold it is ~one = quarter full.=20 When hot, it is 9/10ths full. Also I have a canopy defroster which = takes hot=20 coolant from the heater outlet in the rear housing and returns the = coolant=20 to the pump near the thermostat. 
Later, I moved the temp sensor to = the rear=20 housing where Mazda had its temp sensor. Then I installed = a=20 coolant pressure guage and put the pressure sensor in the front = housing=20 on the sparkplugs side. There is a convenient threaded hole = there for a=20 pressure sensor. Then, I connected the hot coolant outlet on = top of the=20 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=20 remove the pressure cap and loose only a few drops of coolant, = negligible=20 volume. When I start the engine, the gauge shows no pressure = for long=20 minutes, 10 sometimes 15 minutes. Coolant pressure appears to be=20 proportional to engine rpm, but I am still checking on that. The max = coolant=20 pressure I have seen is about 10-12 psi at 5500 rpm. in=20 cruise. Temperatures are lower, both at WOT climb and cruise. = Oil ~190F=20 (I wonder if there is a temperature regulating mechanism inside = Mazda's=20 oil cooler) and coolant ~180F. But that may be due to colder=20 weather. Cloudy and cold around here, at this time of = year.=20 (Sherbrooke, Qu=E9bec.) The overflow bottle (coolant reservoir) = performs as it=20 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=20 if 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=20 ALL!
 
Yvon = Cournoyer.
Rotary Powered Zenair Zenith. = (CH-200)   
 
 
Thanks for the details Yvon. I believe there = must be a=20 thermostat in the oil cooler. I have seen similar fluctuations in = oil temp.=20
Peter
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