For Comparison, Estimated Airflow at Peak Horsepower for Each Engine Type
CFM for Street
CFM for High Performance Street
CFM for High Performance Street/Track
CFM for Race
CFM for Ram Tuned Race
The Second Strike Carburetor Calculator and the accompanying Help document are designed to assist the car and engine builder/modifier looking for balanced performance – a car that is both enjoyable to drive on the street and competitive on the track.
It is recommended that you read the Help documentation, particularly sections Input and Results, before using the Carburetor Calculator.
Street: Stock street engines.
High Performance Street: Modified engine suitable for street driving. Upgraded heads, header, cam, intake, and carburetor. For 1970’s vintage performance parts.
High Performance Street/Track: Modified engine suitable for street and track driving. Upgraded heads, header, cam, intake, and carburetor. For modern performance parts.
Race: Modified engine not suitable for street driving.
Ram Tuned Race: Modified engine with intake and exhaust runner lengths ram tuned for peak power rpm.
The Carburetor Calculator allows you to evaluate different sized carburetors and will tell you how well each performs on your engine by calculating the pressure drop and horsepower loss over a range of engine speeds. You can then determine if this is the right size for your engine.
The calculations are based on equations and data supplied by Holley. Simplifying assumptions have been made to reduce the amount of input and make the calculator easy to use. The mathematical basis for the calculations is contained in the Technical section of the Help documentation for those who are interested.
The Calculator is designed for normally aspirated engines with one or more carburetors drawing through a common plenum, or fuel injection with a single common throttle body. It is not designed for blowers, turbos, or nitrous or for individual runner systems such as Weber carburetors or multi-stack fuel injection.