Hot CHT

Psmith · Post by **Psmith** » Mon Jul 21, 2003 10:26 pm

My no. 2 cylinder head temp is the hottest of the 6. On a summer day during a long climb the temp will reach 500F if I'm not careful. Even during cruise the temp stays around 400F with the other cylinders running between 300 to 375. No 2 EGT is warm but not the hottest. Baffeling is all in good shape. Is this typical of a C145 170A? Does the Model B use the more modern pressure cowl and does it experience hot oil and CHT's? I live in Montana and typically take off from a 6500 ft + DA strip. What do you folks think?

Pete Smith 1320D
Lewistown MT

N1277D · Post by **N1277D** » Tue Jul 22, 2003 12:20 am

I would double check the front baffling component between the cowl and the No. 5 and No. 6 cylinders. If this component is replaced with a similar part from a O300 from a early C172 the temperatures are more uniform from cy to cy.

Post by **Bruce Fenstermacher** » Tue Jul 22, 2003 1:22 pm

From the c-145 TC

NOTE 1. Maximum permissible cylinder head, barrel and oil inlet temperatures, 525Â°F, 290Â°F, and 225Â°F,
respectively.
Maximum oil inlet temperature limit is 240Â°F, when using Spec. MHS-24 oil SAE No. 50 above 40Â°F
ambient and SAE No. 30 or 10W30 below 40Â°F ambient.

As you can see the max cyl temp is 525 and depending on the oil used oil temps can go to 240.
I don't think you have a problem.