http://www.themotorreport.com.au/32175/mazda-patents-direct-injection-rotary-engine-new-motors-on-the-way/


Rob Woods


It appears to be focused on combustion stability at idle
and light load. I see no reference to operation at our power levels.
Apparently with a long skinny combustion chambers and dual spark plugs
set at a specific distance apart the combustion stability is increased.
Probably the drop in BSFC is limited to a single digit improvement for
car power
levels. 5% is implied. Certainly not in the double digit turbo
compound category.
God knows how much R&D money they spent on this.  The geometry is similar
to the Super-Tec engine with the notable exception of the side exhaust
port.

No mention is made of lean operation. Lean operation would pay off
big time if a way could be found to reduce NOX.

Paul Lamar

Isn't there a way to reduce NOX with urea injection?

Brian Trubee

Yes there is and so far Mazda has not taken advantage of that fact.
They keep talking about 14.7 to one.

Paul Lamar

IIRC, Honda had a low-temp NOx catalytic for diesels.  Not sure how well
it would work with rotaries.
Cary