CHTs in a 252

[Retz]

I'm sure there is many many threads with this same question. Please forgive me for asking, it is just that the tapatalk forum search engine is less than optimum, and it returned no results.

Q: WHAT ARE THE HI AND LOW CHT LIMITS I WANT TO RUN IN CRUISE? Not redline but what is best for making the cylinders last.

My #2 cylinder runs significantly hotter than the rest (415ish) with the rest 380ish. If I cool # 2 down, the rest get very cool.

Should 410-415 CHT concern me?

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[CaptRJM]

Everyone that I have talked to recommend that CHTs below 400 is the best way to improve cylinder life.  Are you using an engine monitor?  When you lean out, which cylinder is running the leanest and the richest?  That will help clue you in as well.  If #2 leans first and you have a significant reduction in fuel flow before the last cylinder leans then #2 may be running at peak EGT ... thereby giving you high CHT.

Are you running GAMI's?  I run LOP in my 231 with a -LB engine.  GAMI did such a good job of balancing my injectors all the cylinders lean out within 1/4 turn of the mixture control knob.  Highest CHT is usually 350-355 for cylinder #4.  The rest run around 15-20 degrees cooler.  #6 is the coolest. TIT is 1525-1550. 65% power @ 9.9 GPH gives me 165 knots.  

I imagine that #2 on a -MB is right next to the oil cooler as in the -LB.  You may want to check the cooler and the baffles between #4 and #2 to make sure everything is OK after you find out if #2 is running the leanest.