True. This SB was motivated by a change in CHT sensor design. One version is immersed in coolant, and actually reads coolant temperature. Another type just reads the temperature of the head. Both types are approved for Rotax 912 engines. It is necessary to calibrate the colored arcs properly on your CHT gauges or EMS, so as to be compatible with the particular sensor your engine uses. Since a sensor replacement may result in a different type installed, it may become necessary to re-calibrate the readout if your mechanic changes sensors.Nomore767 wrote: Rotax have an S/B out whereby they differentiate CHT from coolant temp. CHTs, the actual temp of the cylinder head are hotter than the coolant.
One possible solution here is to install the optional oil thermostat. It bypasses the oil cooler until the oil comes up to operating temperature. Designrs has one installed on his plane now; perhaps he'll post his results here.The other day with temps nearly 62F the oil temps were getting high and so a narrower band of tape is needed. It's a question of finding the sweet spot for the right size of tape in the winter months.
I agree. The oil thermostat helps to accomplish this. Of course, if your RV-12 didn't come with one, and it's an SLSA, you'll need to get an LoA from Van's to install it.One point to mention is that a couple of Rotax guys have said it's good to get the oil temp above the magic 212F at least once per day to 'boil off' condensation which can cause damage over time.