Working out Engine Capacity

[Pub24/7]

Hey guys i Have changed to a 2.85lt h/c head on my 3.3lt. So i was thinking would my car no longer be a 3.3lt. I decided to try and work out the capacity myself but every result i get is way off
I was using the formula for a cylinder (v= pie x r squared then x by hieght) then x by 6
But i always comes out too large.
So Basically can anyone give me the math on how they calculate capacity of a motor?

Cheers Pub

[MasterOfReality]

Volume of cylinder = (pi*(diameter^2)/4)*stroke

Engine capacity = volume per cylinder * number of cylinders

[AirStrike]

If I am reading correctly, have you changed the head? If so you haven't changed the capacity of the engine at all.

[Not_An_Abba_Fan]

It may have dropped down to about 3.2 because of the slightly smaller combustion chambers in the head. You would have to measure both heads to see if there actually was a difference though.

[14secvp]

changing the bore and stroke is the only wat to increase capacity the combustion chamber size only effects compression