Greetings Paul,
I came across the attached article which may be of interest.
Kind regards
Aden (Perth)


Aden sent a bunch of pdf files totaling over 5 meg which
is too large to publish so I extracted some jpg's.
Note that Audi was able to gain only 8 to 10 % in fuel
consumption reduction but that including upping the
compression ratio by a point. Therefor without upping
the compression ratio of the rotary you won't see
nearly the improvement in fuel consumption.
Every little bit helps however. My question so far
unanswered is what happens to the NOX and how
is it reduced to meet EPA rules? As far as I know
and as I recall NOX is greatly increased when engines
are run lean.

Paul Lamar ...No rotor no motor.


NOx production is a function of temperature.  The conflict in pollution
reduction is that with lower combustion temperatures the engine may not burn
the fuel efficiently resulting in unburned or partially oxidized organics
(the fuel components) and CO - not a good thing.  With high temperature
combustion the otherwise inert Nitrogen in the air can be caused to create
NO2 et al - not a good thing, as this is a chemical precursor to Ozone which
is created in the atmosphere in a photochemical process when the sun comes
up.  Are the combustion temps in our engines higher with leaning?  That's
why we monitor the EGT in that process, yes?

Jim Beckman
Austin.

We monitor the EGT to get an idea what the mixture is doing
and secondarily to protect our turbo charger turbines from
unnecessary heat. EGT at first goes up as more and more fuel
is injected until it reaches peak EGT around best BSFC. At
that point it starts back down as the engine gets richer and
richer and passes through best power.

Paul Lamar

Nice graph.  Thanks for taking the time to scan things and send them out.  I
really appreciate this forum.

Jim Beckman


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