"Harley, Ageless Wings" wrote:

http://www.AeroConversions.com

 The slide valve carb is a bit simpler than most carbs, has no butterfly
in the throat at WOT, so a bit less flow restriction (slightly more HP).
The lack of a float chamber can be a help or hinderance, depending
on how they ensure a reliable low pressure for the fuel.  Apparently much
less (totally eliminate?????) carb ice potential.  Many A/C installtions
eliminate the carb heat - perhaps at their peril.

Bill Freeman

I got to take a quick look at the carb and am I correct in assuming it is a
constant velocity (or better yet - Variable Venturi) type???

As to them being ice resistant, I would have to disagree. I have suffered

three

carb ice induced incidents with my motorcycle (it uses 3 of them). This has
occurred at temps slightly above freezing while visible moisture was present.

I live in Connecticut and ride all year long. And I would NEVER have one

of these

without carb heat in an aircraft.

Maybe if you live in CA or AZ and fly ONLY in shirtsleeve weather....
Blake

Thanks for the input.  I have a friend and several aquaintences that are
using Ellisons,
some without carb heat.   I have recommended carb heat to them, but only my
friend
has installed it.  I do think that near freezing with visible moisture as
the only
time for icing is icing resistant, since my C150 can make ice on a 80F day
that is
merely humid.  In any case, I do believe that leaving off carb heat is
dangerous for any carb system.

I had a case of repeated, severe carb ice at cruising speed in my '85 Blazer
last
winter; was a devil to troubleshoot.  Finally figured it out and discovered
that
the vacuum actuator for the carb heat was bad, replaced it and it went away.
It happened at about 35-40F, sometimes with light snow, other times sunny.

Bill

 
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