Normal range of Coolant temperatures.

[edmondthx1138]

I own and fly a Van's RV-12iS with the Rotax 912iS. Generally, my coolant temperatures, during cruise, tend to be low, usually 140-150 deg. F.


Lately, and occasionally, I've been seeing coolant temperatures remain at 190-200 deg. F. for an extended period of time, then drop to 140-150 deg. F.


Anyone else experiencing these ranges, or have a comment on their coolant temperatures?

 

[azonslow]

I own and fly a Van's RV-12iS with the Rotax 912iS. Generally, my coolant temperatures, during cruise, tend to be low, usually 140-150 deg. F.


Lately, and occasionally, I've been seeing coolant temperatures remain at 190-200 deg. F. for an extended period of time, then drop to 140-150 deg. F.


Anyone else experiencing these ranges, or have a comment on their coolant temperatures?

The latest POH for the 912 iS (Revision 9 from 4/25/23) only lists the maximum "Coolant" temperature at 248 degrees F. The POH for the RV-12 (Revision 18 from 4/25/23) states:

Coolant/Cylinder Head Temperature*
Normal in Cruise (green arc) 150 to 230 F
Caution Range (yellow arc) 230 to 248 F
Maximum (red line) 248 F

 

[Mich48041]

The cylinder head temperature on my legacy 912ULS is normally between 200 and 210 degrees F.