Light-Sport Aircraft Yahoo group Re: Military Rotax 912/914 with fuel injection..

Or may be the FADEC system required for reliable aircraft engine operation would increase the price of the engine by about 15%.

Just a guess based on a number swung out of the air when a Rotax, Austria rep visited here with a Kodiak rep. They specifically asked me what I would think if the 912 had a full FADEC (required to be ASTM compliant) at about a 15% more price point. I told them, do it in about 8 to 9% and I'd be interested. I am sure all large oem customers got asked the same opinion. So may be its on its way but this was already in 2009. its been a while.
Abid

--- In Sport_Aircraft@yahoogroups.com, "circicirci" <acensor@...> wrote:
>
>
> That is interesting indeed Helen.
>
> I always wondered why since the 912 is about a 20 year old design and EFI s wawell evolved by then Rotax did not go with EFI rather than carbs, because as Peter says EFI gets better fuel efficiency and is more easily tuned optimally for automatically adjusting mixture as altitude changes, no problems of synching carbs, etc.
> Some aircraft engines do have EFI.
>
> I _imagine_ the downsides of EFI include these:
> # If your electrical system (battery/alternator system) fails your engine stops dead as the injectors are electrically driven with a current draw that, unlike the sparkplugs, normally could not be engineered to draw off the magnetos.
> # Probably higher cost on initial manufacturing and on rebuilds and maintainance.
> # EFI engines do not tolerate getting air into their fuel systems. Unlike a carb which has a float bowl to dissipate air bubbles, if air is present on the high pressure side of the pump, air will be injected along with the fuel. This will lead to a lean condition until the air is purged. It should also be noted that most EFI pumps do not process air very well due to their design nor do they reprime well if there is much head involved. In short, a constant, air free fuel supply must be available at the inlet of the high pressure pump.
> # The fuel pumps and fuel lines have to be run at much higher pressure than fuel fed to carbs.
>
>
>
>
> --- In Sport_Aircraft@yahoogroups.com, Peter Walker <peterwalker58@> wrote:
> >
> > Hello
> > They are looking for best efficiency (endurance) EFI is adjustable on the fly
> > Peter
> >
> >
> > ________________________________
> > From: Helen Woods <Helen_Woods@>
> > To: Sport_Aircraft@yahoogroups.com
> > Sent: Monday, December 26, 2011 11:25 PM
> > Subject: Re: Light-Sport Aircraft Yahoo group Is there any carb-icing proceedure for t...
> >
> >
> >  
> > Interesting but little known fact is that the military converts their 912s and 914s (used on Predator drones) over to fuel injection.  I've always wondered why and assumed it had to do with the altitudes they fly them.  Any thoughts?
> >
> > Helen
> >
>

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