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It is worthwhile to mention there are a whole basket of factors determining the bore/stroke ratio of any production engine ranging from legal influences (in England there was for many years a "bore tax" where engines were taxed on the bore diameter and in many countries in Europe the tax on engines skyrockets over about 2.7 litres and 15CV) to manufacturing "conveniences" which is a nice way to say they pick from existing components and do a mix and match to get it all to work ; technical theory and details are often shove abruptly to one side.
Pete.
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