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Calculator For Figuring Choke Point Of Ports




Todays date is 5/28/2025

Enter your Minimum Cross Sectional Area (CA) of your Intake Port

CA equals the minimum cross sectional area of your intake port. (length times width)
This is most times your push rod area, but not always.




CA:
Bore:
Stroke:

Input you Bore/Stroke and CA please




To Figure Your Minimum Cross Sectional Area (CA) of your Rectangular Intake Port

    Make all measurements in inches,
and convert fractions to decimal numbers.
Examples:
1-1/4 = 1.25
2-3/16 = 2.1875 		>>
>> 		(1 4) + 1
(3 16) + 2


Rectangular/Square runners     To calculate the cross-sectional area of rectangular and square runner profiles, measure the width and the height of the runner, and multiply the two together.


Measure in inches!

Runner width:
Runner height:
Runner Area: square inches (calculated)
Area = Width X Height


To measure Round Ports

Round runners     To calculate the cross-sectional area of round runners, measure the diameter of the runner, divide by two, multiply the result by itself, then multiply that by 3.14.


Measure in inches!

Runner diameter:
Runner Area: sq inches (calculated)
Area = (Diameter 2)2 X 3.14





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