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Buddy has technical question, please chime in
http://skywolverines.com/viewtopic.php?f=2&t=5863		 Page 1 of 1
Author:  Henry Bowman [ Wed Jul 08, 2020 8:55 pm ]
Post subject:  Buddy has technical question, please chime in
My buddies Rotax 447 has a CHT and EGT gauges they are from EIS company.
His rear CHT Gauge is reading 450 to 500 degrees and the thermal coating around the sensor keeps melting away a bit where it touches the Spark plug.
His front one reads 180-200 and the EGT is in the green. Engine is running like a champ and has no other issues.
I told him watch EGT and and LISTEN to the engine, but that CHTs are notoriously unreliable.

One friend suggested to get a sensor from a different company, (Westach) or to switch from J or K type to the other.

What does the brain trust here say?
I flew for years with no CHT gauges and just an EGT and was quite happy.
Author:  MadMuz [ Wed Jul 08, 2020 11:38 pm ]
Post subject:  Re: Buddy has technical question, please chime in
I would suggest he first tries swapping the sensor and gauge to the other cylinder and see if the issue goes with the gauge set...

Then I would buy a new pair of matched gauges/sensors and sell the old ones...

Too risky having temp gauges on a 2 stroke (or 4 stroke) that cant be trusted/relied on.... damage can happen more or less instantly... which is not a good thing on a flying machine :eek :drama

Maybe he can borrow some known good gauge and sensors from a friend to confirm what his gauges are telling him? :pop :yoda2 :Wolvie

Edit: If it is the ring under the spark plug type sensor, you can put 2 (the existing and a second to confirm) under one plug, temporarily to see if the original is reading correct. A thermal laser temp gun aimed at the plug are can also confirm if there is a huge discrepancy from what the gauge is saying.

:Jim

:Confederate
Author:  Henry Bowman [ Thu Jul 09, 2020 2:19 am ]
Post subject:  Re: Buddy has technical question, please chime in
I suggested swapping them too. They are cut to fit. He doesn't have any slack.
But the laser pyro.eters a good idea!
Author:  Mceagle [ Sat Jul 18, 2020 6:32 pm ]
Post subject:  Re: Buddy has technical question, please chime in
What Muz said. Put both sensors under the same plug and the gauges should read the same. If not, a gauge or sensor is faulty. Another possibility is an incorrect heat range plug, which could readily hole a piston.
Author:  Henry Bowman [ Sun Jul 19, 2020 4:34 pm ]
Post subject:  Re: Buddy has technical question, please chime in
Hey thanks man, had t even thought about that one!
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