Hey Paul,

Would the oil injection hole just happen to be in the right spot, in relation to
the rotor cycle phase, to serve as a good spot to install a fuel injector for
direct injection of fuel into the combustion chamber?
   Is that spot subject to high temperatures?

If the injector was located there could the fuel be injected close enough to the
leading edge of the combustion chamber to mix well with the incoming air charge?
 It wouldn't be good if all the fuel was concentrated at the trailing edge of
the combustion chamber.

   Mark LaPierre

Most direct injection attempts have shown no advantage.
Best to put the injectors at the start of the runner so the fuel has time to
evaporate.

Perhaps with much higher pressure injectors on the order of 1000 psi.

Those holes are  great for monitoring the actual  manifold pressure.
They give a consistent number regardless of the typ of intake manifold used. If
everybody used those holes it would be much easier to tune Tracy's EFI.

Paul Lamar
--

   The pictures of the direct injected Mazdas show the injector right on top.
   Murry


True but nobody other than Mazda has driven one yet.
The picture on the web site is of a prototype.

We also don't know the timing or pressure of the injection.
Obviously the pressure in that chamber is rapidly increasing.

Everybody is welcome to try but you will need a lot more pressure than 50 psi.
Note there are no direct injection gasoline engines on the market at this time
as far as I know.
Porsche among many others have done a lot of research on the subject spending
millions.


Paul Lamar


We have DFI engines running in the labs here in Dearborn. Soon to be seen at a
dealer near you. We are also spending millions on this technology. Not to give
away any trade secrets, but Paul is on track with his comments. As of yet, I
haven't heard anyone nail the key technolgy that makes it work.
C. Smith

Here are a few more pictures from Oxford. Robin took these and she targeted the
good looking engineer rather than the screen :)

Paul Lamar


Paul


  According to Wikipedia, in 2004 the Isuzu Axiom came standard with what Isuzu
called GDI (gasoline direct injection) and sold in their main stream American
vehicle.

Tom


Where is it now?

---------------------------------------------

Looking at these pictures is is quite easy to figure out what they
are up to. It is called horizontal vortex. Air comes in on a tangent
that causes swirl. The swirl rotation speed increases as the piston nears
the top. Then fuel is injected on a tangent in the direction of
the swirl. The center of the swirl is lean due to centrifugal force
on the fuel molecules. The spark plug is mounted on the edge
of the swirl to ignite the rich parts. This speeds up the
flame front.

The same thing can be done on the Wankel if the center housing side
intake ports are eliminated and high pressure horzontal fuel injectors are located in the front and rear end housings. Only the end housing side intake
ports would be used. The center housing intake ports fight the end housing intake ports.  This to introduce horizontal swirl to the air.
As far as I know this has not been tried yet.

Fuel injectors would not be at the top of the rotor housing.

IMHO the reason you don't see Eco Tec in the US is it too expensive relative to
the price of gas. In Europe where gas is up to $10 a gallon (almost all tax)
it might pay off. The price of crude is about $80 for a 40 gallon barrel today.
That is $2 a gallon for crude alone. (20% of that barrel is gasoline).
So the rest is tax. IMHO the Europeans are getting ripped of by
the government charging $5 to $8 a gallon tax on fuel and the govs are still going bankrupt. The people need to riot to reduce the taxes :)


It is probably cheaper to use hard tires, better transmissions and lower the aero drag.

Paul Lamar