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The formula is Pi X the radius squared Time the stroke Xnumber of cylinders
so on a 350 chevy 3.1417 X 4 X 3.48 X8 = 349859 Hope this helps Chet 




Quote:
http://www.csgnetwork.com/cubicinchdispcalc.html 


formula for displacement
(BORE)X(BORE)X(STROKE)X(.7854)X(NUMBER OF CYLINDERS)
EXAMPLE: 4x4 x 3.48 x .7854 x 8= 349.848576 round up 350ci I've never heard the one using PIE, but it looks like it works... I just find this one a little more simple.. Danny 


Quote:



.7854
I dunno, Some guy smarter then me. I just know it works and It's easier for me. If I works I don't question it.
If u got a gonkulator handy you can check it. It will be accurate every time. It came outta one of my books, Prolly David Vizard... I don't think any of us have a need to question him. just try it. 383ci: bore is 4.030", stroke is 3.75" 406ci: bore 4.155" stroke 3.75" 434ci: bore " " 4.00" 302 : bore 4" stroke 3" 


Quote:
The second number is the radius squared. The radius of a circle is 1/2 the diameter, in this case, 1/2 the bore. The stock bore of a 350 engine is 4.0 so 1/2 of the stock bore is 2 and 2 squared is 2 times itself or 2x2 which is 4. Terry 


Pi is actully 3.141592654.. it does continue, but no calculator can count that high. if you used 3.1417 the displacement would be off a little, it would be more accurate to use 3.14 only.



Quote:
Pi/4 =0.7853982 

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