Carburetor CFM Calculator
This
calculator requires the use of
Javascript
enabled and capable browsers. This calculator is designed to give the engine's
air intake volume requirements. Enter the designation of displacement, 1 for
cubic inches or 2 for cubic centimetres. Enter the engine displacement size
for the designation. Enter the anticipated maximum safe engine RPMs, typically
known as red line. Enter the volumetric efficiency of the engine. (Most factory
engines are a compromise between economy, efficiency, reliability and performance;
about 80% at red line. Engines that have been tuned for improved performance
or have a stronger performance camshaft and valve combination may have up
to 92%. A competition roller cam and valve combination may yield 95% while
blowers often achieve up to 115%.) Click on Calculate to finalize the calculation;
values are updated subsequent to each field change. The value will be returned
in Cubic Feet Per Minute required in both the current and optimum volumetric
efficiencies (VE), based on the entry values you have made. The default values
are for a typical mid 1960s to 1970s muscle car. To do another, click the
Clear Values button and then enter a new value. Calculated accuracy of current
Javascript enabled browsers is generally 16 places.
This calculator will show you the requirement
at WOT, or at the maximum RPM entered, if your Engine is capable of turning 8000
RPM but you shift at 5800 then use the shift point not the max RPM
Big Stall Converters, huge gears and very light cars are not part of the
Calculation and a competent Carburettor Professional should be consulted.
Version 1.2.2
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