Fly Bum wrote:

Figured you folks would be the best to answer this? I
have the opportunity to buy an affordable plane but it
has a two-stroke Rotax 582 with carbs.  I would like
to add a fuel injection so that I can control the
mixture (I will be operating at a variety of
altitudes) and also so that I can hopefully improve
the fuel economy.

I was reading about semi-direct injection and came
across the following? ?This bring us to Ski-Doo SDI -
a quite different and more economical route [vs DI or
HPDI] to low two-stroke emissions and fuel
consumption. SDI stands for Semi-Direct Injection, and
it describes a system by which fuel is injected, not
into the combustion chamber, but into the fast-moving
air streams in the rear transfer ports. Because
injection into the transfer streams more than doubles
the amount of time available for evaporation of the
fuel droplets?.. Cylinder head and piston crown do not
have to be redesigned to work with SDI (they do with
bi-modal DI), and ordinary automotive-type fuel
injectors, working on a normal 60-psi injection
pressure make no call on high technology.?

So is it possible to use this technology (or at least
some fundamental principles from it) in conjunction
with Tracy?s controller to get better fuel economy
from the 582?

Where is the best place to inject- straight into the
port or just downstream of the throttle body?  Also,
better to use a single throttle body and split the
flow (how evenly?) or use smaller dual throttle
bodies.

Thanks folks.

Joa

 
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