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Building Integrity
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Date:  1-1-2014
Number of Hours:  3.00
Manual Reference:  Section 2
Brief Description:  Cooling air intakes

After spending several days researching the BEST downdraft cooling designs I've concluded what mine will be. The design needed to fall in line with the following requirements:

1. Sufficient intake area
2. the path the air takes must have as FEW possible turns
3. The intakes must be hardmounted to the airframe independant of the cowling
4. expansion must not be abrupt
5. all turns must be made smoothly and without sharp transitions.
6. The oil dipstick must not be blocked or in the airstream.

So I looked at every option even including updraft armpits feeding downdraft air into the plenums. All the measurement and calculations were made and I've settled on 4"x4" shoulder scoops feeding a 4" round tube that will lead directly into the plenums at about a 20 degrees angle and expanding enough to distribute air evenly over all the cylinders as much as possible.
I've seen this intake location work well for others but the 12-13" sq intake area is truly optimum for 160HP and many have not dialed that in to their designs. The ones I have researched that have are seeing under 350 degree CHT's on long hard and hot climbouts. SO here we go :)
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marking out the location

marking out the location

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