I understand what Carlos is saying. But The DMX is an example of a motor that makes great power with very small transfer passages. The cccr is a factor to consider, but I also agree with pipe-ster. We can work with quite a variety of things and make them work. In testing various combination for CP industries, we have had a chance to test many cccr setups. Fortunately, we've been able to get satisfactory results out of each cccr we have worked with. As the bore gets larger, the cccr is very hard to get down to the lower ranges. But it doesn't seem to matter; we have some setups that are good as any on the dyno and in the field, that are on the highest end of the cccr range.
As to transfer volume: consider how little time the transfers are full open. And then compare the size of them to the passages. You will find that the volume of the passage does not need to be much larger than the window for the window to be the limitation of the flow. And if the passage was as small as the flow size of the window, the window is still the limiting factor for most of the transfer-open cycle, since the window is closed to some degree at all but BDC.
Fun discussion, but not as critical as some would think, imho.
i just looked at some cylinders that run good and i see a what nate is saying about the transfer window size.