Chris Bacon wrote:
Dave Fawthrop wrote:

IIRC only the maximum emissions of cars are limited, there is nothing
to say you *must* have catalytic converters.


AFAIK all new cars made since January 1993 *must* have a
catalytic converter fitted. Europead directive blah, unless
it's only UK law, which I doubt.

Nope. European law. I vaguely recall an article in 'Car Design and
Technology' magazine[1] in the '80s which said the law had been (badly)
written to require the use of an oxygen sensor and hence a cat and
stoichiometric(sp?) fuel/air ratio of 14.something to 1. Their view was
that lean-burn (20-25:1) was the better solution.

Alan

[1] Anyone remember that? Written from an engineering/technology
viewpoint rather than the What'll it do mister?/Let's see how sideways
we can get it 'round this bend type of mentality.

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