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Old 07-15-2006, 08:24 PM
JBird JBird is offline
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Default Simple Cubic Inch Displacement Formula I use.

Try it.

.7854 is a constant and is just 1/4 of pi
inches in decimal.

Cubic Inches = bore X bore X .7854 X stroke X NOC (Number of cylinders)
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Old 07-19-2006, 12:04 AM
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roadpatrol roadpatrol is offline
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Default RE: Simple Cubic Inch Displacement Formula I use.

An even easier formula is pi (3.14) X half the bore squared X stroke X number of cylinders. IE... pi x r (radius squared ) gives circle area, X height (stroke) gives volume of cylinder, then X # of cylinders. On second thought my way sounds more complicated but since I already typed it I`m posting it anyway :-)

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Old 07-19-2006, 02:35 PM
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JohnG JohnG is offline
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Default RE: Simple Cubic Inch Displacement Formula I use.

you are fine....

the volume of a cylinder is Pi*r^2*h where r is the radius and h is the height.

For a car these translate into: r is half of the bore and h is the stroke.

When you square r, you are then squaring bore/2 which becomes bore^2/4.

For 8 cylinders you then have


or, rearranging, (Pi/4)*bore^2*stroke*8.

For the Ford 352 you have a bore of 4.00 and a stroke of 3.5 you get 351.858 cubic inches.

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