In the new 16X an injector is place on top of the engine.  But the group
thinks that it is there because of the wall could not accommodate another
hole since there is already 2 spark plugs holes.

My question to Paul an the group

On one face of the rotor make two combustion chambers instead of one.
Remove one plug an install an injector in its place.  Your opinion is?

Marc J.

That is not the only reason it is there. A direct injector hole
could be close to the spark plug hole but that does not pay off.
The fuel needs to have time to vaporise for complete combustion.