331 vs. 347 Stroker

[Conman]

Originally posted by 302 LX Eric
Chris - As I was ordering my 331 kit, I was screwing around with numbers trying to figure out how to calculate the volume of a cylinder when I remembered the following formula for volume (regardless of block type )

Formula for volume of a cylinder = Pi x Diameter x Height

Your calculation is pretty close say for a '306'

Yours = 4.030^2 x 3.00 x .7853982 x 8 = 306.133767

Mine = 4.060 x 3.00 x Pi x 8 = 306.1167882

E

you gotta be careful with that formula the volume of a cylinder is not Pi x diameter x height

the correct formula is Pi x radius squared x height
for a 4" bore the radius is 2" so when you square that you get 4 again so it works out in this case but it will not work out if you had any other bore
I don't know if you figured it out or not but that is why in the "yours" formula you used 4.030 and in the "mine" formula you had to use 4.060 (4.030/2 and then squared) and this is not exact.
if you do it exactly you get the same answer to 4 decimal places