I do have one concern though - If and when you need alternate air, will your system function as desired?  Specifically, where would the foreign object (bird) or ice be likely to cause a problem?  I would think that it would be so far into the back of the system that your alternate air would not be functional - ie. the filter would be in front of the problem.

 

A possible simple suggestion would be to put a basic screen at the cowl opening that would block passage of foreign objects.

Would ice accumulate on a screen?  Would this be better than accumulating farther back in the fuel servo?  Is that even possible?

Egad Matt,

 

I have only been worried about dirt filled air on take-off.  This is a solution to that problem.  If a bird (or piece of one) can actually get into my intake it will probably be sucked right through since it would be so small - That is why it is safer to fly WOT.  I am more worried about spearing a bird with my pitot tube since it is not occasionally protected by a fan blade. 

 

I thought I saw that the door was at the front of the filter, thus anything big enough to be stuck early in the passage will cause the engine to draw heated air (heated cooling air) thru the filter.  I don't think the filter would ever freeze up.

 

Many of us fly straight ram air and I don't know of any such that have experienced induction icing even though some have experienced icing conditions. 

 

A screen might be susceptible to freezing up, but then the filter would draw warm air from the engine compartment.

 

As to foreign objects, I suggest you stay away from the borders.  If you meant those oversized invading Canadian Geese, I would rather it hit the air intake rather than my canopy and thus it becomes a canape' in my lap.

 

I am impressed with the rise in MAP even though the filter allows air to flow both ways...........