To calculate the correct carburetor size for your engine, you need to know the engine RPM, the engine displacement, and the volumetric efficiency. This calculator uses the formula:
Carburetor Size (CFM) = (RPM * Displacement * Volumetric Efficiency) / 3456
For example, to find the recommended carburetor size for an engine with a displacement of 350 cubic inches, a max speed of 6,500 RPM, and 85% volumetric efficiency:
$$\text{Carburetor Size (CFM)} = \frac{350 \times 6500 \times 0.85}{3456}$$
$$\text{Carburetor Size (CFM)} = \frac{1,928,750}{3456}$$
$$\text{Carburetor Size (CFM)} \approx 558.17$$
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