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Date: Thu, 07 Aug 2014 07:28:15 -0400
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From: Craig Berland <cberland@systems3.net>
Subject: [LML] High CHTs on #2, TSIO 550
Thread-Topic: [LML] High CHTs on #2, TSIO 550
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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 t=
he 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 Lan=
cair 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 hav=
e seen it the reverse of that as well. If close the oil cooler door the CHT=
 will drop 5dg at times.=20
This was a factory new engine.=20
Any suggestions?
Thomas Whalen
N444TW

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