Originally Posted by Top Gun 777

As I sad before-later closing defenetly helps on top RPMs, but earlier opening is not quiete work like that. There is combination of exhuast timing and induction which shifting power band. Higher exhaust-less dwelf time when combustion pressure push piston down-less torq ( this is general rull). So balance between opening-closing-exhaust is shifting power band.
But again, just timing will not make engine run as fast as possible. Piston/liner assembly makes a lot of inturation (mechanical friction due to the slikines of piston material, tapering on sleeve which create extra friction etc) and here is another art to find best set up. I know that not many people can make their own piston/liner set (actualy it is only one guy can in the world), but defenetly there is big potential baried and our chalange is to bring everything to surface.
Edward