On 15/12/2019 11:31, Axel Berger wrote:
> 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.
>

The california spec MGB had no catlytic converter. Air was pumped into
the exhaust to reduce the *percentage* of CO and hydrocarbons to pass
californias test.

> 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.
>
True, but drifting from the point that *dilution* does not reduce the
amount, only the concentration.

>


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