As I said, I am new to fuel injection and learning a lot. The air in the
fuel problem has to have been dealt with before. My sons are currently
flying a Mooney 20-J that is fuel injected so it can be done.
On Wed, May 13, 2009 at 2:27 PM, Frans Veldman <frans@paardnatuurlijk.nl>wrote:
> >
>
> Curtis Jaussi wrote:
> > Lots of good questions. I can address some of them. Jason is well aware
> of
> > the problem of potential air in the fuel and has designed the fuel flow
> > through the system and back to the tank so that any air should be pumped
> on
> > through quite quickly. This part makes sense to me.
>
> Yes, but it is still possible that some air will make it into the
> injectors. And then? Furthermore, it doesn't has to be air, it can also
> be vaporized fuel. Although any engine hates that, a fuel injected
> engine especially hates it. With the tight and warm Europa cowling, and
> high altitude capability, and the use of Mogas, I think some fuel vapor
> can hardly be avoided.
>
> Also, this system will make it impossible to run a tank dry, before
> switching to the reserve side. So, this poses the problem that one has
> to decide at what level to switch over. 5 Liters at least remaining
> seems to be the minimum to me, and one should not forget to switch over
> in time. (if the reminder is in the form of a sputtering engine, like it
> normally is, it is probably to late for the fuel injection system). With
> 5 liters, one has about 10 minutes left (considering the fact that the
> very last liter will probably have so much air in it that it will be
> unusable anyway). This will cut the usable amount of fuel considerably.
> Any fuel savings due to the fuel injection is offset by the fact that
> you can't risk to run the main side of the tank dry, so effectively you
> can't increase the endurance.
>
> > As for redundency, it
> > is totally redundant with two complete systems: two fuel pumps, two sets
> of
> > injectors, two sets of sensors,separate electrical systems, etc. Only
> one
> > system is in operation at one time and you manually switch from one to
> the
> > other if needed.
>
> Ok, sounds good.
> I think that Jason will probably draw more customers if he puts all this
> kind of information on his website. I could do with less pictures.
>
> Some more information about an upgrade kit for existing 914's would be
> great as well.
>
> --
> Frans Veldman
>
>
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