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rdmac(at)swbell.net
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 Posted: Mon Nov 05, 2007 4:32 pm Post subject: Temp Sensor location was Broken EGT probe |
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Jim,
You bring up an interesting point. Is it more accurate to locate a sensor in the spider tank or on the side of the radiator where the water from the engine enters? One in the spider tank will give you temperature before it enters the engine while the other gives you the temperature after it leaves the engine. Which one is better to know? I’m getting ready to install just such a probe.
Roger McConnell, Duncan, OK
Model 7 Trigear, Rotax 912uls
Flying sense Jan. 06
From: owner-kitfox-list-server(at)matronics.com [mailto:owner-kitfox-list-server(at)matronics.com] On Behalf Of James Shumaker
Sent: Sunday, November 04, 2007 11:57 PM
To: kitfox-list(at)matronics.com
Subject: Re: Re: Broken EGT probe
Luis
The water temperature is the cylinder head temperature. Rotax engines come with a sensor (or two) already installed in the cylinder head. That is correct location to take a temperature reading that you can call a cylinder head reading. There is actually not enough room to install a standard cylinder head temp sensor under the spark plug. When I built my plane, the water temperature gauge was installed in the spyder tank. This is a pretty accurate reading for the water temperature and thus the cylinder head temperature. It is actually more accurate to use the sensor in the cylinder head for those rare instances when the cylinder boils the coolant and then with the sensor in the head you will get a warning of a problem. The instructions that came with the engine (1994 era) actually had the water temp in the spyder and the oil temp in the dry sump. The dry sump oil sensor is a measure of the bypass gases and is not even close to the oil temp so that sensor was relocated. Then an oil cooler had to be installed because the actual oil temps were much higher than recorded in the dry sump. The point is that the water temp sensor you have will be fine, especially if it is connected to the sensor in the cylinder head.
Jim Shumaker
Salinas, CA
Kitfox III, 912ul, 835 hours
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Mon Nov 05, 2007 5:48 pm Post subject: Temp Sensor location was Broken EGT probe |
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out... That is the temp closest to the head temp.
Noel
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Noel Loveys
Kitfox III-A
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Jim Shumaker
Joined: 09 Jan 2006
Posts: 106
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| Posted: Mon Nov 05, 2007 8:34 pm Post subject: Temp Sensor location was Broken EGT probe |
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Roger
I believe that it is best to use the sensors in the heads. The spider collects the water from the tops of the heads and sends it to the radiator, I think that is the way it flows. If it flows the other way then it is even more important to use the senors in the heads. They are already in the engine, your indicator just needs to be able to recieve their signal.
Jim Shumaker
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