"Morgans" schrieb im Newsbeitrag
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I would not think that that is a large enough diameter tubes for engine
cooling. Someone may have used that size and had it work OK, but I would
be surprised. I would think that you would need double that, or one tube
for each cylinder.

sorry, yes, one tube per side. This would be the same what Sonex recommends
for the AeroVee

If you had that size intake, and no tubes, but instead an open plenum
pressurizing one side of the cylinders, you would have much less drag, and
more airflow, than the air slowing down going through the tubes.

yes, but on the other hand would then have much more air leaks. All those
wires tubes going through the baffling...

Also, most "Updraft" cooling engines do not do well on single engine
airplanes, because the windshield is relatively close behind the engine,
and that makes the whole top of the engine cowl an area of positive
pressure.

Outlet would be about one feet in front of the cowl/windshield intersection.
The cowl blends almost straight into the windscreen. There should be
negative or zero pressure on the exit side and poitive pressure on the
scoop.
You may have aloog on this sketch:
http://www.ph21.de/guest/updraft-cooling.JPG

However question is how close is this to the pressure situation of my bird.