Have you guys heard of any weird lycoming 4-cylinder situations that would make oil temps unusually high for all conditions? I have an O-320-160 that's giving me oil cooling problems.
CHTs are good (actually, they're very good. With some temporary cooling mods it was difficult to keep them all above 300 in 42 deg F OATs, oil temp was 185), engine runs smooth, makes good power, but oil temps are high (usually 220 or higher in cruise with ~55 deg F OATs. As the OATs go up, so does the oil temp). Oil pressure is great at ~80 psi at oil temps of about 220 deg F and below. Running XC 20w50 and a Champion oil filter on a Lycoming oil filter adapter.
Oil temp gauge and sender are checked good with the hot oil bath method, new vernatherm has been installed (the old one had a perfect circle witness mark on it which makes me think the seat is fine, though I didn't actually check the seat). Oil cooler is new as of 5 flights ago (meggit-troy 8406R).
First flight after the new oil cooler, oil temps were ~170 in 55 deg F OATs, now are back to being high (200-220 in ~40-50 deg F OATs)
Most folks I know are blocking their oil coolers off in similar OATs to try and get up to 180 deg F oil temps.
Any weird lycoming stuff you've seen in the past that I can check out? Next step I think I'm going to take the oil cooler lines to a local hydraulic shop to get inspected. My visual inspection with a flashlight didn't turn up any issues. What else should I look at?