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Air cooled engines usually use the SDS sensor provided. This has 1/8 NPT threads and is screwed into a
primer or injector port as shown below. Some engines can use a bolt on adapter where no 1/8NPT holes
are provided on the engine.
Other air cooled engines may use oil temperature. If this was your choice, you’d have a GM 3/8NPT,
1/8 NPT or Bosch 12 X 1.5mm sensor. Tap your sump accordingly.
SDS 1/8 NPT CHT sensor mounted in primer port hole.
(Lycoming). This sensor is used for cold start and warmup
enrichment only and will read much colder than dedicated
CHT sensors embedded in the center of the head. 6
cylinder dual systems use 2 CHT sensors.
When routing the Engine Temp sensor cable to the
sensor keep the cable away from spark plug wires by at
least 1 inch, and never zip tie this cable to the spark
plug wires. There is danger the plug wire could arc to to
the temp cable damaging this input in the CPU
Air Temperature Sensor
On Lycoming installations, we supply 1/8 NPT sensors. The
air temp sensor needs to see induction airflow. There are
provisions on 60 and 80mm throttle bodies to mount these
as below. 6 Cylinder dual systems use 2 air temp sensors.
Other engines may use 3/8 NPT or Metric 12 X 1.5mm
sensors. Tap accordingly. When routing the Air Temp
sensor cable to the sensor, keep the cable away from
spark plug wires by at least 1 inch, and never zip tie
this cable to the spark plug wires.
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