Cooling effectiveness & Cowlings

[MYR]

The objective of this thread is to try to get ideas from the readers as to improve the cowlings cooling for air cooled engines.

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Could someone tell me why the NACA air inlet of Kitfox and Jabiru planes are placed point ahead ? Why are these air inlets not placed the point towards the rear ?

Bernouilli proved that when the air speed increases the pressure decreases.
With the point of the inlet ahead and the large width at the rear, the air speed dicreases and the pressure increases.
In my mind, if the pressure of the air flow increases, it prevents the warm air that is around the engine to go out towards the cowling air outlet.
I should have placed the point toward the rear as to decrease the air flow pressure and create a air suction like in a Venturi tube.


Please explain me if I am right or wrong ?
Is this idea of making a suction in the bottom of a cowling with a venturi effect is realistic or not ?