Tom,
1.  Climb at 165 kts after a few thousand AGL.
2.  Set Take off WOT fuel rate to 43 GPH if it is not already there.
3.  I find leaving the oil door cable out about 3/8 inch does not hurt oil temp and helps #2 CHT.
4.  Adding a "bulge" in the oil cooler duct to increase the air flow past the C/L of the #2 cylinder helps.
5.  Some TSIO-550's do not have enough full rich fuel when power and RPM is pulled back in climb.
(What MP and RPM do you climb at?  What fuel rate?)
6.  I am assuming you have a 75 hrs or more on the engine.

I have not done #4 and I have a personal max CHT set at 400 degF.  I never see more than 390 degF at any flight condition unless something is wrong.
I suspect I got some bad gas coming back from Oshkosh in Burlington, CO and my climb temps were still OK.  Cruise became another thing.

Craig Berland
N7VG


I have been fighting for over a year to try to keep the #2 CHT below 400 dg on the climb. It has hit as high as 430. I leave it full rich and climb at 140kts. When I level off, I then LOP and then #1 cools off. I have the Lancair baffles and RTV the gaps with the engine and have a good baffle seal. I even covered my 3rd intercooler and that only helped a little. Behind the prop the baffle seals up to the top cowl but not down to the bottom. I have seen it the reverse of that as well. If close the oil cooler door the CHT will drop 5dg at times. This was a factory new engine. Any suggestions?
Thomas Whalen
N444TW

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