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Building Integrity
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Date:  7-15-2014
Number of Hours:  8.00
Manual Reference:  Section 2
Brief Description:  Cooling plenums

-One of the Hottest topics in the EZ world has been, and always will be on cooling our power plants. From CHT's to oil temps, history shows a wide variety of successes and failures. Before deciding on what I would do, I read as many posts as I could find on these issues and was able to determine 3 things:
1. Proper intake area is CRITICAL
2. Updraft is much more affective and consistant than downdraft
3. My engine is NOT made for updraft cooling from any perspective

These 3 things basically told me I'd be taking a harder road to good cooling but it wouldn't be impossible to do it. Now doing it RIGHT the first time will be a miracle. However, in my design I am implementing 11.5 sq/in of inlet area per side and smooth transitions from intake to cylinder heads and out.
The one big question I have is how much open space needs to be inside the plenum chambers. Should it be large and open or is it ok to squeeze it down for a lower drag profile in the cowling. This really will be an experiment that I PRAY works well as I really don't want to build another set of plenums and a new upper cowling. For now, the sides will be aluminum pre-cut from UL, and the back, top, and front will be a custom molded carbon fiber layup to seal it up. I did a lot of trimming to get the profile I needed so next will be the carbon work. More fun to come :)
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stock UL plenums

stock UL plenums

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cut lines determined

cut lines determined

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first plenum almost done

first plenum almost done

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