Quote Originally Posted by TheChosenOne
I see what your saying, but the stroke isn't being changed, so the space is only bigger when the air and fuel are taken into the cylinder. When it is compressed, I have a feeling the cobustion chamber isn't larger at all. But like I said... this is just my own logical theory.

you are correct the combustion chamber stays the same the whole time only the bore size and stroke changes the compression unless it's opened up on the head to match the bore size.