> >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

        >   I am into snowmobiles and I use an adjustable needle kit that screws
        > into the drain plug of the carb, it is operated by a speedometer
        > cable, it works great and a hell of a lot simpler that going to
        > injection and less to go wrong.
        >   Also there is a kit that adjusts the pressure on the air correction
        > jets that works good and the late model snowmobiles use a automatic
        > alt adjusting carb that is computer controlled.
        >   They tried injection on snowmobiles and it didn't work out.
        >
        >   Ken Welter

Ramón Fonseca wrote:

I also fly 582's (4 of them) . I understand that Bombardier/Rotax very soon will announce a fuel inyection option for this engines. Ramon

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