Last updated on November 12, 2024

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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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