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Test Series No. 3
" For this series of tests the carburetor was equipped with a needle valve, and test were made over a range corresponding roughly to air-fuel ratios of 9 to 17. Carburetor air temperature was maintained at 41 deg C.
At two humidities, corresponding to 13.4mm Hg and 52.2 mm Hg, fuel consumption, power, and optimum spark advance readings were taken at 12 points over the range of air fuel ratios stated above. "
The range of fuel mixtures is wider than test number 2. Optimal settings were used to determine the BSFC. Also since readings were done at steady state a feed back carburetor is of no use.
Note that no fuel consumption figures were compiled in test 2. Also they attribute the power rise using the smallest orifice to automatic enrichment of the mixture at higher humidities. This would drop FE.
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