The Natural Philosopher wrote:
> Any more than adding an air pump into the exahaust of california
> specification MGBs reduced their emissions. They did pass the test of
> course.

I am not sure what exactly you're refering to here. One thing I do
remember from long ago is adding air to the exhaust from fuel-rich
combustion to supply the oxyigen surplus the catalytic or rather thermal
concerter needed to burn off the hydro carbons. This did indeed reduce
emissions.

A much higher efficiency is reached by using lean burning engines in the
first place, but then you tend to maximise nitrous oxides and there's no
easy way to reduce them.

Unfortunately the forays into the far-lean conditions achievable by e.g.
plasma ignition were cut off when the fast rise in standards could only
be met quickly enough by catalytic conversion of stochiometric mixtures
and there was no longer any money for alternatives that had a long way
to go at fuel prices that did not make efficiency an important goal.


--
/¯\   No  |    Dipl.-Ing. F. Axel Berger    Tel: +49/ 221/ 7771 8067
\ /  HTML |    Roald-Amundsen-Straße 2a     Fax: +49/ 221/ 7771 8069
 X    in  |    D-50829 Köln-Ossendorf      http://berger-odenthal.de
/ \  Mail | -- No unannounced, large, binary attachments, please! --

--- SoupGate-Win32 v1.05