Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Fri, 20 Dec 2002 18:53:14 -0500 Message-ID: X-Original-Return-Path: Received: from cpimssmtpu08.email.msn.com ([207.46.181.83] verified) by logan.com (CommuniGate Pro SMTP 4.0.2) with ESMTP id 1931580 for flyrotary@lancaironline.net; Fri, 20 Dec 2002 12:01:50 -0500 Received: from BigAl ([68.7.218.110]) by cpimssmtpu08.email.msn.com with Microsoft SMTPSVC(5.0.2195.4905); Fri, 20 Dec 2002 09:01:39 -0800 X-Original-Message-ID: <005401c2a849$85c25660$6400a8c0@BigAl> From: "Al Gietzen" X-Original-To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: water pressure X-Original-Date: Fri, 20 Dec 2002 09:02:02 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0051_01C2A806.763992F0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2720.3000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Original-Return-Path: alventures@email.msn.com X-OriginalArrivalTime: 20 Dec 2002 17:01:39.0318 (UTC) FILETIME=[7673E160:01C2A849] This is a multi-part message in MIME format. ------=_NextPart_000_0051_01C2A806.763992F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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.=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. Yvon; One reason your cooant temp is lower is likely because of the change = in the postion of the sensor. At the rear housing the coolant is only = half way through the engine. Although most of the heating is on the = plugs side, the temp back at the pump housing would be expected to be a = little higher. Al ------=_NextPart_000_0051_01C2A806.763992F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

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 temps=20 had to be monitored at WOT climb but would stay close to 200F at cruise. =

Later, I moved the temp sensor to the = rear housing=20 where Mazda had its temp sensor. Then I installed a coolant = pressure=20 guage and put the pressure sensor in the front housing on the = sparkplugs=20 side. There is a convenient threaded hole there for a pressure = sensor.=20 Then, I connected the hot coolant outlet on top of the rear housing = to the=20 top of the coolant pump body. So now, at ambient temperature, engine = cold.,=20 there is no pressure in the cooling system. I can remove the pressure = cap and=20 loose only a few drops of coolant, negligible volume. When I start the = engine,=20 the gauge shows no pressure for long minutes, 10 sometimes 15 = minutes.=20 Coolant pressure appears to be proportional to engine rpm, but I am = still=20 checking on that. The max coolant pressure I have seen is about 10-12 = psi at=20 5500 rpm. in cruise. Temperatures are lower, both at WOT climb and = cruise.=20 Oil ~190F (I wonder if there is a temperature regulating = mechanism inside=20 Mazda's 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 did=20 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.

Yvon;

One reason your cooant temp is = lower is=20 likely because of the change in the postion of the = sensor. At the=20 rear housing the coolant is only half way through the=20 engine. Although most of the heating is on the plugs = side, the=20 temp back at the pump housing would be expected to be a little=20 higher.

Al

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