![]() ![]() Street performance engines have VE levels below 100%. Certain race engines can actually exceed thisĪnd reach a VE% of over 100% at certain points in their RPM range. ![]() Many performance engines reach this level. If an engine could use all of the air it ingested, it would have a VE% ofġ00%. The first two items (CUBIC INCHES and RPMs), are relatively easy to determine. Finally you also need the VOLUMETRIC EFFICIENCY PERCENTAGE (VE%) of theĮngine. It goes like this: You need to know the CUBIC INCHES of the motor. One general rule of thumb uses a formula to determine the CFM requirements of your engine. The other parts you have chosen and your intentions concerning how the vehicle is going to be used. NOT going to immediately put 100 more horsepower at your disposal. What is the rear gear ratio? Do you want to get the best gas mileage possible or do you want toĭevelop the most power possible? Keep in mind that a carburetor is just one part of theĮngine combination. Motor? What is the volumetric efficiency of the motor? Do you have a manual or auto transmission? Street use, towing, street use with occasional trips to the track? What type of intake manifoldĭo you have, split plenum, open plenum, tunnel ram, individual runner? How fast do you spin the ![]() What cubic inch size is your motor? What do you do with it? Race, One of the first things to determine is what size carburetor do you need? A number ofįactors come into play. Join our Forums! Holley Carburetor Tuning Tips Carb CFM Sizing ![]()
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