Quote:
Originally Posted by Jakobi
It offers a dynamic exhaust port, by restricting it with the PV flapper. It's not just open/closed at a certain RPM. The spring also determines the rate at which the PV opens.
As you said though, it also offers a dynamic exhaust effect in that the drum valves are open as the flapper is closed, which increases the volume/length of the exhaust. As the flapper opens, the PV chambers are closed off.
So the whole system works to offer the best results at both ends of the powercurve, but also has a large influence on the nature/flavour of the powercurve depending on the timing and duration at which everything happens.
Ideally you'd want access to a dyno with the intent of getting the strongest spread of useful power at all rpms. By having the PV slam open early all you'll really achieve is a delay in the power hitting hard which may feel faster.
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Excellent advice as always Jakobi.
I figure that Munch is looking at the adjustable powervalve featured in newer models and on KTMs and such and trying to bring that over to his bike.
I wish I could offer him more help, but am not knowledgeable enough to give him any help in the manner he has requested.