Wire length of CHT/EGT harnesses supplied by Dynon Avionics is not critical. It is
acceptable to cut the thermocouple (brown) wire of the CHT/EGT harness to
shorten the appropriate length for your installation. It is recommended to not cut
the “armored” portion of the cable near the sensor end of the CHT or EGT sensors.
CHT wire may be extended as well, provided that:
1) Type J thermocouple is used for the extension wire. (This is different than EGT
wire)
2) There is no temperature change across the connection between the junction
that is created. For example, do not create a junction across the firewall.
If either of the above guidelines are not followed, your CHT readings will be
incorrect.
Dynon Avionics sells and supports a variety of CHT sensors. All thermocouple harnesses
supplied by Dynon Avionics have each function (e.g., CHT1, EGT1) labeled on each
thermocouple pair.
Lycoming/Continental
Dynon Avionics sells bayonet style CHT sensors (used in Lycoming and Continental engines).
With each sensor we sell, a bayonet adapter is included. Your specific engine manual should
describe where to mount these bayonet adapters, but normally, there is a threaded hole (CHT
well) near the bottom of the cylinder close to the lower spark plug. Screw the bayonet adapter
into this hole. Screw the locking collar up or down the spring surrounding the sensor such that
the tip of the sensor is pressed against the bottom of the CHT well when the collar is attached
to the adapter. Insert the CHT sensor into the well and lock the collar to the adapter. Now, plug
each thermocouple wire into its corresponding wire on the thermocouple harness. Ensure that
you match the wire color pairs on the harness to those on the thermocouples.
Rotax 912 (except 912 iS) and Rotax 914
Rotax 912 and Rotax 914 engines use 2 resistive CHT sensors that are included with the engine.
These sensors are preinstalled, but you need to route the connections from them to the SV-
EMS-220. See the Rotax CHT Sensors Section for information on making the physical connection
to the sensor.
Jabiru
Jabiru engines require a 12 mm ring-terminal CHT sensor for each cylinder. First, slide the
compression washer off the spark plug. Slide the 12 mm ring-terminal sensor onto the plug.
Now, slide the spark plug compression washer back onto the spark plug. Reinstall the spark plug
into the spark plug hole. Please refer to the documentation that came with your engine for
more information. Now, plug each thermocouple wire into its corresponding wire on the
thermocouple harness. Ensure that you match the wire color pairs on the harness to those on
the thermocouples.
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