best Ford RS200 facts

2. In the mid-1980s, international Group B regulations imposed an arbitrary ‘engine enlargement’ factor of 1.4:1 to turbocharged engines. This explains why the RS200 engine was of 1,803cc, which equated to a nominal 2,524cc, just above the lower 2.5-litre limit, and allowing later ‘works’ cars to run with enlarged engines – up to 2,143cc and the upper 3.0 limit if necessary.

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