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i've heard of this trick on rotary tuning pages, where the leading sides of the rotor are ground away (corresponding with the side inspiriation ports) to advance the intake timing without cutting into the perhipheral housing with an extended J-Port ("Monster" port)...
so, this means that to really get "Zero" overlap, Mazda could advance the intake timing to the point where the rotor is JUST coming around to TDC when it starts to open (that's like, earlier than piston engines friends)... COOL BEANS TO THE MAX!! :D
of course, with the "correct" porting you could advance the timing wellllll before TDC, not that it'd be a good thing, but you could... :p
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