The British motor industry was developing and producing lean burn engines in the late 80s early 90s. There was a big debate as to whether lean burn or catalytic converters were the way ahead. The British government supported lean burn but the EU decided to bring everyone in line with the US by introducing legislation to make cats compulsory. One interesting thing is that the manufacturers increased engine capacity on nearly all lean burn engines. 1.3 engines became 1.4 and 1.6 engines became 1.8, I did think that that was to retain performance but it may have been coincidental and related to EU taxation classes..
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