Dynon Avionics SkyView System Installation Guide - Manual (Page 148)

SV-EMS-220/221 Installation and Configuration
7-36 SkyView System Installation Guide - Revision S
Rotax 912 (except 912 iS)
For carbureted Rotax 912 engines, only two of the four cylinders are typically monitored for
EGT. Unlike the CHT probes which are mounted on diagonal cylinders, the EGT probes should
be mounted on the two rear cylinders’ exhaust manifolds. It is critical that the EGT probes be
mounted to parallel cylinders’ exhaust manifolds for proper temperature comparison.
Rotax 914
The 914 uses threaded EGT probes that screw into bosses provided on the 914-specific exhaust
manifold. Two probes 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 probes the
same distance from each cylinder.

Make sure the hole is placed to ensure that the probe does not interfere with the cowl or
spark plug. Also, when making holes, keep in mind that the probe could inhibit the ability to
perform routine maintenance if placed incorrectly.

Place probe 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 have each function (e.g., CHT1, EGT1) labeled on
each thermocouple pair.
A loose probe could allow exhaust to leak. This can lead to carbon monoxide
poisoning in the cabin and/or a potential fire. Have a knowledgeable mechanic
inspect the installation.
The probe can come loose during flight, and could potentially come in contact
with rotating engine parts or the propeller. We suggest a safety wire to keep the
probe in place.
Cylinder Head Temperature (CHT) Probes
Wire length of CHT/EGT harnesses supplied by Dynon 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 probe end of the CHT or EGT probes.