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 seenat
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


Paul,
all the eco-boost engines from Ford are direct injection.... high pressure
pumps and injectors available at your local Ford parts counter.
Larry

Are you sure. Craig is working there:)

Paul Lamar
-
http://en.wikipedia.org/wiki/Ford_EcoBoost_engine
Larry Childs

"It is the first EcoBoost engine to include Twin-Independent Variable CamTiming (Ti-VCT), with advertised 10-20% better fuel economy while maintaining the performance of 3.0 liter V6 engines. Power will be at least 230 bhp (170 kW), and torque will be at least 240 lb·ft (325 N·m). Ford announced the production would begin in 2010."

Will be? Where is it? :)

Paul Lamar