What many dont seem to get is that there is no " flow " from the case , thru the transfer ducts and out the port into the cylinder - even around BDC where the most bulk flow occurs.
There is more volume in the ducts , than there is mixture transferred into the cylinder.
Having a greater volume directly below the transfer duct entries may have a beneficial effect on power , rather than volume that is effectively " trapped " inside the crank.
But I believe a change in total volume , that moves the case Helmholtz frequency , has more influence.
RV engines " like " big case volumes , no matter how its achieved.
Reeds I have found have a tipping point at exactly 1.3 ratio . Any bigger than this and the reed stiffness has to be changed to so soft , they loose control and flutter .
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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