I am breaking in my new IO-540 and on the fourth flight I noticed a spike in Cylinder 4 EGT after landing. To a lesser extent the CHT also climbed.
This is what the temps looked like at cruise (25"/2500rpm). Pretty normal except maybe for CHT 1 & 2 being higher - need to trim the dams a bit more. Note Cyl 4 CHT is consistently the lowest temp and EGT spread is minimal.
After landing the Cyl 4 EGT crept up significantly in relation to other cylinders and Cyl 4 CHT is now the highest.
What might explain this spread at ground power settings? What to check? I am thinking ignition or fuel injector blockage but am still pretty new to this.
The data logs for flights 1-3 do not show this spread (EGT or CHT ) for cruise power or ground power settings.
This is what the temps looked like at cruise (25"/2500rpm). Pretty normal except maybe for CHT 1 & 2 being higher - need to trim the dams a bit more. Note Cyl 4 CHT is consistently the lowest temp and EGT spread is minimal.
After landing the Cyl 4 EGT crept up significantly in relation to other cylinders and Cyl 4 CHT is now the highest.
What might explain this spread at ground power settings? What to check? I am thinking ignition or fuel injector blockage but am still pretty new to this.
The data logs for flights 1-3 do not show this spread (EGT or CHT ) for cruise power or ground power settings.