So I’ve monitored my M20J- IO-360 A3B6D cylinder head temperatures for quite a while. I consistently notice that the number two cylinder runs cooler than the other three. I understand number two is out in front and gets quite a bit of air, but I know the baffling is designed to properly flow the air over all four cylinders. I’ve inspected my baffling, and it all appears to be correct. No obvious signs of air leakage around the soft baffles or air escaping between the cylinders is present as best I can tell.
I have a JPI EDM900 so I know the temps are probably pretty accurate. #2 seems to run about 30-40 degrees cooler than the rest. For example- last night I flew it quick to check the temps after checking all the baffling. The OAT was 32 degrees and I flew it LOP at about 68-70% power and in level flight it stabilized out as follows:
1- 333
2- 303
3- 334
4- 336
oil temps and everything else are normal and where they should be.
I can’t help but notice that on the number two cylinder more of that cylinder is exposed with the way that the metal baffling is designed from the factory. The number one cylinder has a taller piece of tin in front to deflect air up and through the cowling. Has anybody else experienced this type of temp spread? If so, What did you do to fix the issue?