REFLECTOR: Uneven Cylinder Cooling

[Jones Nick]

It looks to me that the two hottest CHT are on the same cylinders with the hottest EGT. In this case it would follow that the hottest CHT are because there is more heat generated in these cylinders than the others. IMHO, I would look at why there is a difference in the EGTs before chasing the CHT issue. If your EGTs are even and the CHTs are different, then I would start looking at cooling issues.

Best regards,

Nick and Connie Jones
Velocity XL-RG
N10CN
99% done 90% to go

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Richard J. Gentil
Sent: Sunday, March 11, 2012 1:02 PM
To: reflector at tvbf.org
Subject: REFLECTOR: Uneven Cylinder Cooling

I'm about 20 hours into the flight testing of my SERG with the dual overhead  NACA cooling plenum on a Lycoming IX-390-X and three bladed MT Prop. 

I have added aluminum deflectors in the runners of the plenum to direct more air to the number 3 & 4 cylinders and made sure that the plenum does not have any air escaping around the outer edges of the cylinders but no luck so far. 

Here are the numbers  getting on the engine: