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Thermocouple CHT rings

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AirEupora

Joined: 01 Nov 2009
Posts: 186
Location: Dixon, CA

Posted: Thu Nov 15, 2012 10:52 pm Post subject: Thermocouple CHT rings

I'm having trouble getting reliable reading on my MGL EFIS system.  I through the engine was overheating, but have learned that the EFIS/EMS is showing the readings at 36 C hotter than the K type probe I used to check the cylinder head temps vis the EFIS readings.  It takes a few minutes to remove the cowling then the plenum chambers.  The temps drop to about 110-130 C according to the K type probe, but the EFIS shows then to be hotter.



I have checked the K type in ice  and boiling water and it is right on.  The CHT probes show normal temps, but as soon as heat is applied they start drifting towards the hot side.



I'm not sure what to do.  The CHT probe are K type probe with a solid wire extension to the EMS unit.  The EMS unit is grounded to the engine block.



Any ideals would be a big help.



Rick Stockton

Europa XS

Jabiru 3300L

N120EJ

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