Formula for computing cubic inch displacement

[AirBuick]

How is cubic inches of displacement computed? Do you multiply length of block height times stroke times bore size times # of cylinders? Can it be derived from just bore size and stroke?

 

[GN owner]

Cubic Inch Formula

The formula is bore diameter X bore diameter X stroke X .7854 X No. of cylinders = CI

Liters = CI / 61

 

[Axle]

Bore diameter x bore diameter x .7854 x stroke length x number of cylinders = displacement

So current GM 3.8L, for example.

3.80 bore, 3.40 stroke.

3.8 x 3.8 x .7854 x 3.4 x 6 = 231.3599904

That's cubic inches. Now, multiply that by 16.387064 because that's how many cubic centimeters in one inch and you get
231.3599904 x 16.387064 = 3791.3109697241856 which is rounded up to 3800. Since the volume conversion for 1 Liter is 1000 cubic centimeters, you get a 3.8L.

 

[86brick]

The simple way.......

http://www.aera.org/tech/cube_calc.html

 

[tangofox]

Could also do it this way.
pi x R^2 x H x #cyl=CID

3.1415 X 1.9^2 X 3.4 X 6=231.36

 

[AirBuick]

Thanks guys!