What Size Carburetor Do I Need For A 350

Agustus 27, 2022

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Then 1,659,625 ÷ 3456 = 480 cfm. Even with about a 10% cushion, a 500 cfm carburetor will handle this engine great. If you try this formula yourself, be honest with how much rpm the engine will see. You’d be better off with a carb smaller than needed rather than something oversized that can lead to poor drivability and performance.

350 cfm because the larger size causes too much intake air back pressure needed to create the forces like air and vacuum that would be required for combustion’s not as efficient. A 350 will pump a maximum of 175 cu. Of air per revolution at 100% volumetric efficency. Let's assume your 350 could turn an over estimated 6000. That means you would pump 1,050,000 cu. Of air through the motor per minute. (175 x 6000 = 1,050,000) one cubic foot is equal to 1728 cubic inches (12 x 12 x 12). They make use of 350 cc engines and usually tend to have an rpm of 5500. Considering these values, the cfm rounds up to 445.