Today's Message Index:
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1. 06:01 AM - Unscientific test 914 Air box temp (William Daniell)
2. 01:09 PM - Re: KGEZ (h&jeuropa)
3. 07:07 PM - Re: Unscientific test 914 Air box temp (Area-51)
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| Subject: | Unscientific test 914 Air box temp |
I have been wondering about my airbox temp for some time and the
possibility of detonation. My mechanic in Colombia said not to worry about
it so I tried to live in denial ...without avail. Pilot paranoia wormed
its way in.
But I quailed at the thought of taking my instrument panel apart and wiring
a probe into my dynon.
So i bought a chinese rpm and CHT instrument from amazon and clamped the
CHT ring to the aluminium up tube from turbo to airbox.
The interwebs tells me that the max Airbox Temp is 88C
T/O power 37" took the temps to 65C
Cruise 29"-33" @3500' up to 5000' was steady at 56/57C.
Intuitively this is consistent with the fact that I have numerous standard
zip ties holding electric and control cables to the airbox and none of them
have melted.
William Daniell
LONGPORT
+1 786 878 0246
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Just a quick update.
There are around 8 people planning to attend.
Donuts and burgers/hot dogs are set.
We're working on setting a hotel for those that need it.
There is plenty of parking for planes and cars. I'll send gate codes to those driving
in.
Weather forecast as of today, looks nice, sunny with high of 74 low 54.
Looking forward to seeing everyone.
Jim
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=511436#511436
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| Subject: | Re: Unscientific test 914 Air box temp |
It's better than nothing and may be a little inaccurate due to factors such as
external ambient air flow within the engine area passing over the compressor pipe
itself; so the reading may be under actuals.
The best sensor is one that is immersed within the compressor free stream. A 'K'
thermistor would suffice. Thermocouples are more accurate and more expensive
and are used on Rotax.
The 914 HMM provides impedance reference graph for the plenum temperature sensor;
you could possibly splice into this circuit for a piggyback reading, and you
would need to ensure there is no risk of damaging the TCU by doing so. A comparable
screw in thermocouple sensor itself costs about $8-$25 on ebay.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=511439#511439
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