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