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-BSFC during engine dyno sweep testing can be thrown off by normal fuel flow meters lagging behind carb booster fuel flow.
If you don't believe this do both an upsweep and downsweep and compare the BSFC, fuel flow, and dyno calculated A/F ratio readings. Caculated A/F ratios can be especially off because airflow turbines can lag behind RPM changes during sweep testing just like fuel flow meters.
Steady state testing will produce the most accurate BSFC numbers.
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