Posted for Walter Atkinson <walter@advancedpilot.com>:

 Lorn:
 
 430dF in the climb?  That's higher than I would want.  I make sure my CHTs do
not get above 380dF, and we shoot for the mid 300s in climb.
 
 Your engine would appreciate it if you could lower the climb CHT of 430.  We
have seen multiple episodes of thermal runaway at temps above 420dF and it's
good to remember that the head has lost 50% of it's strength at 400dF.
 
 I suggest that your FF might be a tad low and/or there are baffle issues with
that cylinder.
 
 Walter
 
 

"""
 My CHTs are running at between 320°F and 390°F in cruise(depending on the
power setting and OAT) and up to 430°F in climb. I have 1,000 hours on the
engine and it still looks perfect from a compression and oil consumption point
of view. What are we doing so differently?
"""