High CHT indication
Posted: Sun Nov 12, 2017 7:40 am
On my most recent flight I noticed a high CHT indication only on the #1 side. When I cut power the CHT dropped. I was about 20 miles from home base so I proceeded at low power and landed with no issue. I did try to bring power back during those 20 miles but each time the CHT rose. When I downloaded the engine data I see that this happened on 6 flights since June when the airplane was new (Bristell with 912ULS) but I didn't notice them at the time. Oddly enough, when CHT#1 rises, CHT#2 falls. At its highest point on the last flight, CHT#1 rose to 259, while #2 dropped to 157. My question is - is that really possible? My understanding is that the Rotax CHT probes are really coolant temp probes. If there is only one coolant system, can one side really be 100 degrees higher than the other, or is it an indicator problem? Any comments would be appreciated.