Just stuff  a K&N cone filter in the 3 inch opening and duct
tape it

in
place. You'll lose a bunch of power but you can still fly.
Air pressure will help hold it in.

That last idea is what Mooney does. Put a slide valve in the
ram air
scoop
and a tennis ball one way valve in a filtered hot air pipe
feeding one
end
of the plenum. Once the ram air valve is open the tennis ball
one way
valve will close.

Paul Lamar

Will you draw such a system?   Please.    Jerry

Here is a slightly better version.

BTW if the snorkel ices up this ball valve automatically opens up
providing heated air to the intake system.

Paul Lamar

Ok, Paul you know that even race engines often use air filters now.
The usual criteria are similar to the radiators large area thin
section. Jerry
if you want to use a filter you need to have a alternate air
source, as the
filter may clog with ice. The best method is to use a large
(volume) air
box with the major volume after the filter. The modern cars use a
style
that indicate that the designers are familiar with K & L. The
filters are
large area flat rectangles with a wedge inlet, followed by a large
clear
exit box. Jerry since you will probably need a round cylinder to
fit it in.
The small tapered filters will be way to restrictive. You need a
larger
volume. The bigger the better.
Bill Jepson

Not if they want to win :) Drag races are sometimes won on .001
seconds.

On a 24 hour race the winning car is 5 feet in front of second place.
What is the percentage difference in performance? :)

Paul Lamar

Regarding air filters: One of the Seawinds went down when the air
filter was ingested into the engine because it was not properly
restained behind the filter by some sort of stiff and rigid wire
frame. This on a turbo IO550. Make sure you do it right and have an
alternate air bypass as well.
Marc Wiese

Excellent advice Marc.  This thread has gotten ahead of where I am at
with the design.  I think a source of filtered air is a very good idea
even if, most of the time unfiltered ram air is used.  But other than
Paul's "ball" valve, which I think is neat,  I have not had a chance to
think about  how to pull it off.  Jerry

 
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