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Hi folks, I have been seeing high CHT temperature on cylinder #1 over the last year and am having trouble nailing down the culprit. CHT often exceeds 400 degF in cruise when running 100 degF ROP when it used to operate well below that. We are having to run super rich (150-200 degF ROP) and often fly with the cowl flaps open. We have recently changed this cylinder due to a small crack at the spark plug hole discovered during the annual inspection, however, this high temperature issue was apparent before this replacement. I also notice that the EGT on this cylinder is the lowest of all. Here is what has been checked so far: 1) CHT probe #1 swapped with #3. No change in readings. 2) Air cooling baffles checked - ok 3) Fuel flow divider recently checked - clean 4) New injector installed - no change 5) Fuel lines tested last year for even flow from divider to injectors - ok 6) Intake system checked - no leaks 7) Exhaust system checked - no visible issues 8) Mag timing checks out ok 9) Spark plug is black showing we are running rich (matches with what we are doing to keep CHT below 400) Anyone engine gurus out there have any advice? Brenden 81 M20J Calgary
