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Voodoo would be a very good assessment… The ‘Clicks’ theory only works if all motors involved in the comparison have the exact same:
2. Exhaust back pressure (i.e. matting AND pipe condition)
3. Spark plug
5. PV spring tension
6. PV Bellows tension
7. PV friction coefficient inside the valve slot
I often enjoy listening to competitors ‘voodoo’ speech regarding power valves. And watching the other persons reactions to it.