its's an 9A with a O-320 E3D / MT C/S electric prop, Just trying to get any tips on solution for hotter number 2, it's usually 15-20 degrees hotter than 1,3,4. others are around 385 and #2 is above 405, on a climb i see up to 425. I have already removed the front dam completely. also my oil temp is running about 210-215, my oil pressure is at 60psi at running temps, if i raise the oil pressure the oil temp goes up, if i lower the oil pressure down to 45 it runs around 185-190. Looking for ideas on how to attack this problem.. thanks
Rico - a couple thoughts.
15-20 degrees warmer than the others is really not much. A very small difference in fuel/air mixtures from one cylinder to the next can easily do that. Comments here about one cylinder running "lean", therefore it is hot, could be somewhat misleading. A lean cylinder could also cause it to run cool, it just depends on where along the rich-lean spectrum you happen to be.
As others have noted, if your fuel burn is only 11 gph on WOT/max rpm, that is a problem likely separate from the temperature difference you've noted.
One cylinder's egt (and cht follows a similar pattern) will always peak first and one will peak last, the only question is how much total fuel flow difference is there between those. I didn't see any confirmation, but do you have a carb? Also, is your fuel totalizer showing the correct amounts at fill-ups?
There are many, many threads on this subject, all good reading material. Verify and fix the low fuel flow at wot, and then do the "gami spread" data collection and report back. This is where you establish, e.g., 24/2400 level, and start very rich. Gradually lean by .1 or .2 gph until the engine has lost a lot of power and is likely running rough. Pause about 30 seconds between each setting to allow temperature stabilization. The rough running as you have passed lean of peak is due to each cylinder putting out different amounts of power (assuming non-uniform mixture distribution). This test will tell us a lot of information.
Re the oil pressure, as others noted it should be set higher than what you've reported. Sometimes a different spring is needed to enable adjustment within the 80psi range. I think Lycoming makes 3 different ones, color coded.
I have no opinion as to why the temperature and oil pressure would be inversely correlated.