REFLECTOR: ram air vs filter

[Tom]

Yesterday I added a K&N cone filter directly to the intake on the 
engine. I have updraft cooling and the cone was located near one of the 
inlets so I assumed sufficient air would be available. Test flew this 
morning and lost about 1.5" of manifold pressure and 200 rpm (fixed 
pitch so this translates directly to speed). Additionally the plugs 
loaded up. Pulled the filter today and put the ram air back as engine 
was obviously not getting sufficient air. Just an FYI for anyone 
contemplating something similar.