Boy, I was way off. Thank you.
>
> ----
> Frank Wimberly
>
> www.amazon.com/author/frankwimberly
>
>
https://www.researchgate.net/profile/Frank_Wimberly2>
> Phone (505) 670-9918
>
> On Fri, Mar 30, 2018, 9:53 AM Steven A Smith <
[hidden email]> wrote:
> I just read up a little on Selective Catalytic Reduction which seems to
> characterize Bruce's Urea-injection system.
>
>
https://en.wikipedia.org/wiki/Selective_catalytic_reduction>
> Which is similar but different to Air Injection:
>
>
https://en.wikipedia.org/wiki/Secondary_air_injection>
> both in various combinations with two-way and three-way catalytic
> converters:
>
>
https://en.wikipedia.org/wiki/Catalytic_converter>
>
> I remember in the late 70s, early 80s when we imagined that an ICE
> engine that could efficiently convert atmospheric oxygen and the
> hydrocarbons of fossil fuels into pure CO2 and H20 would solve any and
> all "pollution" problems. Folks like Bill McKibbin were already trying
> to alert us to Greenhouse Gas problems, but I know *I* wasn't listening
> past my TechnoPhilic hearing aids.
>
> As for Ed's apocryphal "peeing in the gas tank", urine being primarily
> H20... it seems highly unlikely that the <2% additive of Urea or Uric
> Acid would be any benefit in emissions, though there have been systems
> that injected water into the air-fuel charge which I believe (under very
> limited conditions) increased power/efficiency by small margins, but I
> think that was a result of cooling the incoming mixture effectively
> increasing the difference between input/output temps resulting in
> similar effects of increasing compression ration?
>
>
> - Steve
>
> > I seem to remember this as being associated with higher nitrogen oxide
> emissions than richer-burning. Has that long since been fixed?
> > I believe that NO emissions are associated with the lean burn of
> > Petrol... I'm not sure why Diesel is less apt to that... perhaps the
> > longer chain hydrocarbons, the higher compressions (a different
> > pointin the pressure/volume/temp space?) or the more "natural" or
> > complete combustion conditions without a spark?
>
>
>
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