8LikesThread: Help selecting a carburetor
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05-24-2019 07:51 PM #4
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- Car Year, Make, Model: '33 HiBoy Coupe, '32 HiBoy Roadster
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X2, but if you're set on a carb Google "Carb sizing based on cubic inches" and you'll find the accurate calc relating them with rpm and volumetric efficiency.
Originally Posted by 34_40
From Speedway - The formula for calculating how much CFM (cubic feet per minute) an engine requires is: CFM = Cubic Inches x RPM x Volumetric Efficiency ÷ 3456.
Any ordinary stock engine will have a volumetric efficiency of about 80%. Most rebuilt street engines with average bolt-ons have a volumetric efficiency of about 85%, while race engines can range from 95% up to 110%.Last edited by rspears; 05-25-2019 at 10:26 AM.
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A belated Happy 78th Birthday Roger Spears
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