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Rotax 914 AirBox Temp (Read 343 times)
Aug 31st, 2018 at 2:27am

apache   Offline
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I need to monitor the AirBox Temp of the Rotax 914, I'm using GPI3. Considering  that on the 914 (Turbo) the temperature inside the Airbox could reach over 80°C,  I set FUNCT as COOL TEMP since CARB TEMP max range is 66°C.
What sensor should I use ? I tried the carb temperature sensor Dynon P/N 100468-000, but specifications said (-45 to 65°C) so I'm afraid that returned temperature indication is not correct.
Would be better to use the Sensor Type 4  Rotax (VDO) 801-10-1 (range up to 150°C) ?

Pleas note: on the Rotax engines,  the only way to measure the Carb Temperature is to install a sensor on the airbox, (no plug hole on the carb !) so could you modify the GPI3 FUNCT from CARB TEMP to AIRBOX TEMP with no temperature preset limits or add a new function 5 to GPI3 with same configuration options as the COOL TEMP ?   
 
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Reply #1 - Aug 31st, 2018 at 4:59pm

Dynon Avionics   Offline
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The GP temp is designed to use an OAT probe, which won't reach the temps you might encounter. Coolant temp - as you surmise - is probably the closest in range. But there isn't a way to rename it, unfortunately.
 

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Reply #2 - Sep 3rd, 2018 at 7:28am

apache   Offline
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OK.  So there is no presetting to measure the correct airbox temp ? bur regarding the probe, which is better,  the Rotax(VDO) 801-10-1 or the Dynon 100409-00x to reach max 100 °C ? 
regards
 
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Reply #3 - Sep 4th, 2018 at 5:08pm

Dynon Avionics   Offline
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They're both nominally oil temperature probes, so they are both designed for the range. I can't speak to which one might be more reactive to changes (since air will cool/heat the sensor a bit slower than fluid against the sensor will)
« Last Edit: Sep 4th, 2018 at 5:09pm by Dynon Avionics »  

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Reply #4 - Sep 6th, 2018 at 7:21am

Jacques   Offline
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I also have a ROTAX914 in my Europa and I was thinking of using the data stream coming from the TCU that already contains the airbox temp to enter the CAN input of an EMS-221. A small arduino with a CAN interface and a RS232 voltage adaptor would make it. Decoding the TCU stream is pretty easy. I never got the opportunity to check the CAN stream and if it would be possible to have such infos correctly processed by the EMS-221.
 
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