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