Here it is Doc. You could get in a situation
where the air going into the scoop becomes unstable.
This might occur where the engine air requirements and
the forward motion of the air plane supplys just enough
air to keep up with the engine requirements.
Sort of an air direction oscillation. I am not saying
it is going to happen. I am saying it might happen.

You might have to grind off a small piece of the engine
here and there. The scoop sides and bottom could be
an extension of the plenum.

> Paul Lamar
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That small intake manifold inlet might be an excellent place to install
a NACA duct- Id guess a little less drag.

Mike Parker

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Perhaps but the NACA engineers do not recommend them for carb
air or heat exchangers.

Possibly because of the potential problem I mentioned.
If a small pressure builds in the opening air will be diverted
around the opening. Its called external diffusion or compression
(if one would like to look it up on google). Unfortunately it has
come to mean many things to many different disciplines.
Basically the air merely flows around a scoop rather
than into  it.

Also read:http://www.rotaryeng.net/how-to-cool12.html
Wherein NACA scoops and external diffusion are discussed.

There is really no substitute for a good perpendicular
ram air scoop if you are looking for significant pressure.

Paul Lamar ...No rotor no motor.

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