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Old 07-27-2011, 07:54 AM   #2
Bruce Woodrow
Join Date: Jan 2008
Posts: 37


The problem described sounds very much like a PV that is not opening. First, I will assume that the PV has been assembled with the blade the correct way up and the small pressure signal hole in the PV gasket is aligned with pressure signal port in the barrel. I can only think that the small diameter pressure signal port in the barrel has become blocked by exhaust crud and needs to be cleaned.

You can also prove/disprove the PV as culprit by trying the performance with the PV cover and spring removed, so that the PV stays open. The performance will be very poor below 7,500rpm, but if it revs out past 10,700rpm, you know the PV is to blame.

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