ShortSnorter
Well Known Member
I have a factory new IO-390 and have completed 3 short (5 min) ground runs one of which was a full power run (snip below). On all 3 runs #4 EGT & CHT are noticeably the coolest but nothing too crazy. My question revolves around the how fast the EGT dropped around the 3:45 mark as compared to the other cylinders. Is this indicative of a something that should be investigated further at this point, monitored closely, nothing to worry about, etc...
*The airplane was fully cowled during the test run below facing into ~15kt breeze.
*The airplane was fully cowled during the test run below facing into ~15kt breeze.