Transcription of HOW TO SELECT THE RIGHT CARBURETOR SIZE - Holley
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HOW TO SELECT THE RIGHT CARBURETOR SIZE - Holley
Volumetric EfficiencyBefore you can determine the correctcarburetor size for your engine, youmust know its volumetric efficiency is an indicator ofhow well an engine can breathe. Thebetter an engine s breathing ability the higher its volumetric efficiency. It isexpressed as the ratio of the actualmass (weight) of air taken into theengine compared to the mass whichthe engine displacement would theo-retically take in if there were no ratio is expressed as a percent-age. It is quite low at idle and lowspeeds and varies with engine efficiency should becomputed at the expected operatingRPM or your engine the following examples as aguide to estimate the volumetric effi-ciency of your engine.
right choice usually works out to be a 650 to 700 CFM carburetor. A light car, such as a Camaro, Mustang or Duster may be able to use a 700 or 750 CFM unit, especially with a high numerical gear ratio (low gear ratio). When in doubt, select a smaller carburetor size because it will typically give better acceleration times – even though power
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