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AaronD Indeed the engine is now about square with the 73 mm bore on the 71.2 mm stroke. This should work for a 4000 to 5000 rpm range according to an earlier given article.
The smaller bore carburettor helps to get a higher velocity earlier in the rpm range. For good torque the speed in the inlet is to be as high as possible. For instance the Cosworth formule I engine which dominated for many years used a inlet track diameter of 26 mm to create 30+ horsepower with a 33 mm valve.
Jan
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