few will know how this is worked out or how overcome or resolve these issues
thats what i said and certainly includes me. Now i can guess that due to the flame front in the YB having less ultimate distance to travel than an off centre generated point of ignition that is why the advance is affected.
Dunno how volumetric efficency would effect the demands but it obviously does and i know that thanks to techie post's from Karl ect.
As opposed to your useful posts about how you tightend a bike chain in halfords lol