First I indicated this here Idle and warm up tuning
But as this is something to take a closer look by itself I decided for a separate post.
As I’m working on air-cooled engines, I expect the higher CLT temps and things related to them are not that much tested as with water cooled engines.
The thing is I have Idle Target RPM table defined as below:
And by some reason this target gets increased to almost 1400 RPM in the range of c.a 126+ deg Celsius by a reason not understand by me.
This is something that is occurring every time I start the engine and bring it to the warmed up state (c.a. 150 deg Celsius). When I stop the engine and cool it to c.a. 126 Celsius, the target drops to the value defined in the table.
What is interesting it seems when I stop the engine, the target still gets increased with the engine cooling gradually (which kinda makes sense without this “addon of ~300 RPM”, as I want more RPM with cooler engine to get a drop to “normal” around 126 deg).
Attaching log with few start ups / warm ups / cool downs.
20240811_1321-Idle-Target-RPM-Increase.emublog3 (2.3 MB)
What I am missing?