I've been thinking about these numbers for quite some time and trying to compare this rotory valve design to the supplanting technology ie reeds. Take for instance the open time between tdc and The 60-72 degrees after tdc. Isn't the piston descending but the crankcase side unpressurized due to the intake being open? Why isn't the flow at the carb reversed until valve closure. What's the point of it? What's the point of fifty degrees or so of valve closure at bdc until it reopens. Does this somehow increase the rate and volume of charge flowing up the open transfer interval. Wouldn't a reed valve close much closer to tdc and reopen much closer to bdc? Why does increasing the intake duration further past tdc as in an anticipato grind do any good. Wouldn't increasing the intake open to almost tdc and closing it earlier after tdc increase the molar volume of gas and air to flow via the transfers when they open and increase horsepower?? Wouldn't the engine want to start better because the vacuum at the carb is more efficient?
This not entirely abstract. I am still trying to figure out why my polini kit with anticipato is such a dog.