Return-Path: <13brv3@bellsouth.net> Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 85792 for flyrotary@lancaironline.net; Sun, 23 May 2004 11:26:30 -0400 Received: from rad ([65.6.194.9]) by imf25aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040523152629.TYSQ15189.imf25aec.mail.bellsouth.net@rad> for ; Sun, 23 May 2004 11:26:29 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] water temp sender Date: Sun, 23 May 2004 10:24:28 -0500 Message-ID: <015401c440da$09cdd8b0$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0155_01C440B0.20F7D0B0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0155_01C440B0.20F7D0B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I now have another question. Since I found out that I'm measuring water temperature twice, and not measuring oil temperature at all, now I have another issue. I getting about a 20 degree difference between the two coolant temps. The way you measured the temps is the way it should be, as long as the = water is flowing well. The water leaves the engine at the thermostat housing, = so it has picked up all the heat it can from the engine. That will be the hottest point. The water then goes to the radiators, cools off, and = comes back to the engine. It then goes through about half the engine to get = to the point where the other sensor is located. It should be cooler here, = than it will be when it makes it through the other half of the engine to get = to the thermostat housing. Ed must have a wacky gauge :-) For water, the standard is to measure it as it leaves the engine, which = is the hottest point. I would think that's what you'd want to do with the = oil as well, but unfortunately, there's no practical way to do that. The = oil drips back to the pan from different places, and you can't measure that return flow directly. You can measure the pan temp, as I did = originally, but it's not the best reading, since there isn't really a constant flow = of oil past the sensor. I suspect that measuring the oil as it returns to = the engine was selected as the next logical point. I have the pan temp = hooked up as an Aux temp on the EM-2, but I can't say I've looked at it yet. = Maybe when Tracy gets around to that data logging... :-) Cheers, Rusty (better to be covered in aluminum than fiberglass) =20 ------=_NextPart_000_0155_01C440B0.20F7D0B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

I now have another question.  Since I found out = that I'm=20 measuring water temperature twice, and not measuring oil temperature at = all, now=20 I have another issue. I getting about a 20 degree difference between the = two=20 coolant temps.

The way you measured the temps is the way it should be, as long = as the=20 water is flowing well.  The water leaves the engine at the = thermostat=20 housing, so it has picked up all the heat it can from the engine.  = That=20 will be the hottest point.  The water then goes to the = radiators,=20 cools off, and comes back to the engine.  It then goes through = about half=20 the engine to get to the point where the other sensor is located.  = It=20 should be cooler here, than it will be when it makes it through the = other=20 half of the engine to get to the thermostat housing.  Ed must have = a wacky=20 gauge :-)

For water, = the standard is=20 to measure it as it leaves the engine, which is the hottest = point.  I=20 would think that's what you'd want to do with the oil as well,=20 but unfortunately, there's no practical way to do that.  The = oil drips=20 back to the pan from different places, and you can't measure that = return=20 flow directly.  You can measure the pan temp, as I did originally, = but it's=20 not the best reading, since there isn't really a constant flow of oil = past the=20 sensor.   I suspect that measuring the oil as it returns = to the=20 engine was selected as the next logical point.  I have the pan temp = hooked=20 up as an Aux temp on the EM-2, but I can't say I've looked at it = yet. =20 Maybe when Tracy gets around to that data logging... = :-)

Cheers,
Rusty = (better to be=20 covered in aluminum than=20 fiberglass)  
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