Rotax 912 (except 912 iS)
For carbureted Rotax 912 engines, only two of the four cylinders are typically monitored for
EGT. Unlike the CHT sensors which are mounted on diagonal cylinders, the EGT sensors should
be mounted on the two rear cylinders’ exhaust manifolds. It is critical that the EGT sensors be
mounted to parallel cylinders’ exhaust manifolds for proper temperature comparison.
Rotax 914
The 914 uses threaded EGT sensors that screw into bosses provided on the 914-specific exhaust
manifold. Two sensors that should work are the Westach 712-4D6K and UMA 2B30. These
sensors are not available from Dynon Avionics.
Most Other Engines
Once you have determined the appropriate EGT locations for your engine, drill 1/8” diameter
holes at the specified positions in the exhaust manifold. Usually, this spot is 2 to 8 inches
(50mm to 200 mm) from the cylinder. This spot should be on a straight portion of the exhaust
manifold, as this provides a better fit for the hose clamps. For best results, mount all sensors
the same distance from each cylinder.
Make sure the hole is placed to ensure that the sensor does not interfere with the cowl or
spark plug. Also, when making holes, keep in mind that the sensor could inhibit the ability to
perform routine maintenance if placed incorrectly.
Place sensor in exhaust manifold, and secure it by tightening the clamp with a flathead
screwdriver. Make sure the clamp is tight and provides a secure fit, but do not over-tighten
such that visible stress is put on the pipe.
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 thermocouple. All
thermocouple harnesses supplied by Dynon Avionics have each function (e.g., CHT1, EGT1)
labeled on each thermocouple pair.
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