Return-Path: Received: from fed1rmmtao06.cox.net ([68.230.241.33] verified) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 86416 for flyrotary@lancaironline.net; Sun, 23 May 2004 22:23:58 -0400 Received: from davidandanne ([68.111.224.107]) by fed1rmmtao06.cox.net (InterMail vM.6.01.03.02 201-2131-111-104-20040324) with SMTP id <20040524022356.GREA10012.fed1rmmtao06.cox.net@davidandanne> for ; Sun, 23 May 2004 22:23:56 -0400 From: "DaveLeonard" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: water temp sender Date: Sun, 23 May 2004 19:24:04 -0700 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0071_01C440FB.82C4C8C0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_0071_01C440FB.82C4C8C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit MessageI would ditto what Rusty said but if you study the cooling passages well you will note that the second pass is the hot part of the engine. In other words, the coolant comes the engine. goes along the top and spark plug side, past your sensor, then down and across the combustion chambers and exhaust/intake side, then back out at the pump. This further explains the difference in temp. Dave Leonard -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Russell Duffy Sent: Sunday, May 23, 2004 8:24 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: water temp sender 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) ------=_NextPart_000_0071_01C440FB.82C4C8C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
I=20 would ditto what Rusty said but if you study the cooling passages well = you will=20 note that the second pass is the hot part of the engine.  In other = words,=20 the coolant comes the engine.  goes along the top and spark plug = side, past=20 your sensor, then down and across the combustion chambers and = exhaust/intake=20 side, then back out at the pump.  This further explains the = difference in=20 temp.
 
Dave=20 Leonard
-----Original Message-----
From: Rotary motors in = aircraft=20 [mailto:flyrotary@lancaironline.net]On Behalf Of Russell=20 Duffy
Sent: Sunday, May 23, 2004 8:24 AM
To: = Rotary motors=20 in aircraft
Subject: [FlyRotary] Re: water temp=20 sender

I now have another question.  Since I found out = that I'm=20 measuring water temperature twice, and not measuring oil temperature = at all,=20 now I have another issue. I getting about a 20 degree difference = between the=20 two 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=20 radiators, cools off, and comes back to the engine.  It then goes = through=20 about half the engine to get to the point where the other sensor is=20 located.  It should be cooler here, than it will be when it = makes it=20 through the other half of the engine to get to the thermostat = housing. =20 Ed must have a wacky gauge :-)

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