I am using a Fram paper filter, 6 inches by
14  inches. I think I am getting a big restriction from it, so I will
remove it and  try some ground runs. I also think I'm running way too
rich,
about
34- 7/8s up  the scale on my EM2.



Consider what will happen when/if that paper filter gets wet from  (verga)
rain or snow, is there an alternate intake path?

BrianG
Iowa

That is a good question. I wonder what they make aircraft air filters from.
I have flown my 182 through poring rain in Alaska more than once.

Paul Lamar
-- It's been my understanding for years that an alternate air intake is
required for injected engines. This is usually a spring loaded door on the
intake pipe to the throttle body past the air filter. Common installation in
most AC FI engines.......mine opens automatically if filter is blocked to
any degree-blockage by dirt, rain, ice, bugs, ducks [yes, had duck bits in
one of them when I hit a duck at night!] -by dint of rising pressure. I have
an indicator micro switch on it to tell me if it creeps open (for any
reason). KRN and Bracket make foam air filters for certified aircraft
now----but I'm told they may add some restriction-more than paper ones-but
then silicone is the most harmful thing that can come thru the intake on the
ground.......and a good filter helps keeps it out......
Marc

I think that is silicon and not silicone.  AKA sand.

Paul Lamar

Actually, silicon is the name of atomic element # 14, Si.  It is
used extensively in semiconductors, etc.   Silicon dioxide, SiO2,
or Silica,  is a common form of sand originating from quartz rock.
Silicon dioxide is a common element used in most glass manufacturing.

Joel
Over the Hill Ceramic Engr.

An alternate air intake is on the to-do list along with
replacing the SS exhaust flex tube with inconel before
the plane can venture outside gliding distance to the runway.

Brian Trube