Pat, and BTerry,

First, thanks for the lessons in how the air moves through the cowl. It's all pretty "obvious", but i must admit to never having really thought about it as a pressure differential exercise...makes planning airflow a good bit easier.

However...either I'm still blank on something (Entirely possible...I was, after all, educated in Kentucky), or perhaps I didn't phrase my question correctly...as I don't believe I've found an answer yet in either of those posts. (Entirely possible it's there, and I just don't realize it.)

Both of you discuss HOW we can move the air through the cowl, and the necessity of using pressure differential to accomplish that...and I agree with everything you've said...at least as much as my knowledge will let me. *heh*

However...the question was more (at least in my mind) an "engine question"...

Don't we want air moving (however we manage to get it to move) over the entire cylinder, rather than an given part of it (Like the center).

Put another way...isn't ANY airflow (regardless of how it's created) that bypasses some of the cooling fins less than optimal? I understand Pat's point that if we must choose, there are more or less beneficial areas...but isn't optimal to not have to choose...to cover the entire cylinder?