Hamid asked: Do you have a source for heated air?

No.  

But I put both the air filter and the alternate air inlet behind the spinner
and not in the main flow entering the cowl inlets so that super cooled
droplets will be separated inertially in much the same way that turboprops
use inertial separators for the same reason.  The droplets are unable to
make the quick 90 degree turn to enter either the filter or alternate air
inlet, and are carried aft to be deposited on the intake manifold tubes
(where they will make ice) or cylinder heads and cylinders (where they will
melt and drain downward).  

Being fuel injected, carb ice is not an issue.

Ice crystals from cirriform clouds could be an issue for the air filter,
blocking air flow like a thick layer of dust.  I know it was for my TR-182
when flying high in the winter.  Snow was not a problem for the air filter
as it was apparently unable to enter the NACA scoop on the side of the cowl
that fed induction air to the air filter.  

The alternate air inlet I have now permits the filter to be bypassed and the
engine will happily swallow small ice crystals (and snow  flakes as well, I
expect) with no problems if they are able to negotiate that tight bend.
However, being normally aspirated, I very much doubt that I will ever climb
to cirrus clouds in this airplane.  

Fred

-----Original Message-----
From: Hamid Wasti [mailto:hwasti@lm50.com]
Sent: Monday, 28 April 2008 4:33 AM
To: lml@lancaironline.net
Subject: Re: [LML] FW: Intake for IO550

Fred Moreno wrote:
> The attached pictures show the induction system I built for the IO-550 in
my
> Lancair IV.  

Do you have a source for heated air? How will the system handle an
unplanned icing encounter? Both the Mooney and the Baron (two systems I
am most familiar with) have alternate sources that draw warmed air from
the engine compartment.

Regards,

Hamid