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for #5 you want about a 1" high by 2" wide hole at the max diameter of the cylinder, with a little roof pointed slightly down, since the airflow is likely up there.
for #2 you want enough clearance between the back of the cylinder and whatever you have there for air to pass by reliably. someone else will have to chime in but I thin
1/4" is the recommended amount.
other factors are fuel flow and whether you have the exhaust tunnel extensions or not.
the latter will pull more air through the cylinder fins.
----- Original Message ----- From: "David Standish" <carbonflier@gmail.com>
To: <lml@lancaironline.net>
Sent: Sunday, June 21, 2009 8:30 PM
Subject: [LML] TSIO 550 CHT
I have just spent an unsuccessful hour searching the archives regarding baffling modifications to address relatively hot CHT on No.'s 2 & 5 on the LNC4. I am aware that some builders have made a small opening in the baffling ahead of No. 5 behind the alternator. I would like to know the dimensions and exact location that has been successful in lowering No. 5 CHT. I have also read here that a "blister" in the forward face of the oil cooler box will help lower No. 2 CHT, any comments?
David Standish
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