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1971 the capacity of motor grew to 1600 cc and the regulations allowed first time over head camchafts. Ford got fast the advantage because Cortina lotus 1600 engines provided an ideal starting point for engine tuners. But at the beginning the new cars were two to four seconds a lap slower than their 1000 cc predecessors and on fast circuits even Formula Fords may well be quicker. General opinion was that the new engine was giving only 110 hp compared with 125 hp for the 1000 cc engine at the end of their reign.
The major problem was the new and too little tested air inlet restriction of 20 mm. It was illogical to pay almost gold for a full race twin cam engine with fuel injection and then strangle it so much that much cheapier pushrod single carburetter FF mill of the same capacity has roughly the same power. So CSI of FIA had pledged to examine the situation with a view to incrasing the 200 mm inlet restriction by up to 24 mm.
F 3 general regulations 1971-1973 Maximum capacity of 1600 cc unsupercharged. The engine block and cylinder head castings must be derived from a production touring car of which not less than 5000 units have been built in 12 consecitive months. The same requirement applies to the gearbox and differential casings. These need not have have come from the model from which the engine is taken. Not more than five forward gears may be fitted. Minimum weight 440 kg. The engine grew 1974 to its current 2-litre size.The engine capacity must be less or equal to 2 litres and the engine block must be taken from a four cylinder production model touring car engine.
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