Horsepower Vs Torque
The carburetor’s metering ability is largely related to engine speed versus venturi diameter and booster sensitivity. Displacement, engine speed, cam timing and intake-runner length and configuration all dictate a booster’s effectiveness. Dogleg and stepped boosters, as shown here, make good top-end power, but they don’t meter as effectively on the low end. Annular discharge boosters are far more sensitive at low engine speeds. Hence, they can provide torque gains where you need them. However, if you run them at very high engine speeds, you will need a carburetor modified with removable air bleeds so that you can tune out the excessive fuel flow at a high rpm. View Related Article
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