Hoping you can help me diagnose this issue.
A friend of mine just bought a 1962 M20C model. They've been doing touch n Goes to get used to the airplane.
last night, I decided it would be fun for us to do a little VFR cross country. So we set out, all temps were looking great.
As soon as we stopped climbing and entered 'cruise' the CHT's went from 380ish to over 600.
We immediately turned around and headed back to the airport, but as we were descending the CHT's went right back down to around 300 or so.
I must mention that the cowl flaps will not close. I THOUGHT that cowl flaps closed in flight was to help engine cooling, but I could be wrong.
Any idea? Bad probe or gauge? Surely it never actually got to 600F.....