I've been chasing a high CHT (on all cylinders) issue for a while now. I've replaced the baffling, replaced intake tube gaskets, verified engine to mag timing, verified sufficient fuel flow, and everything else I can think of.
During climb all 4 CHT's will rise at roughly 1 degree/second and unless I aggressively get the airspeed up they will easily pass 400F. They never used to go above 370 in a climb.
The other day I thought to try isolating the mags during a climb. At about 1000' agl with both mags operating the CHT's were climbing rapidly. Switching to just the right mag didn't change anything. Switching to just the left mag not only immediately stopped the CHT's from climbing, but they then started going down fairly quickly. I switched back and forth several times and each time the right mag would make the temps climb and the left mag would bring them down.
It sure seems to me that the right mag has figured out a way to advance itself, but is it possible for a mag to fire earlier than the 25 degrees it is set for? These mags are absolutely set at 25 degrees, run up and mag drops are normal, starting is normal and the engine runs great just like always.
During climb all 4 CHT's will rise at roughly 1 degree/second and unless I aggressively get the airspeed up they will easily pass 400F. They never used to go above 370 in a climb.
The other day I thought to try isolating the mags during a climb. At about 1000' agl with both mags operating the CHT's were climbing rapidly. Switching to just the right mag didn't change anything. Switching to just the left mag not only immediately stopped the CHT's from climbing, but they then started going down fairly quickly. I switched back and forth several times and each time the right mag would make the temps climb and the left mag would bring them down.
It sure seems to me that the right mag has figured out a way to advance itself, but is it possible for a mag to fire earlier than the 25 degrees it is set for? These mags are absolutely set at 25 degrees, run up and mag drops are normal, starting is normal and the engine runs great just like always.