Pcp experts. Info required.

[RobF]

Is this a gross generalisation or can the consistency of pcps be improved simply by balancing the hammer spring with the valve spring?

Cheers, Del.

When you mean balancing, what do you mean?

The hammer spring has to accelerate the hammer, which is a lot heavier than the knock open valve, but the valve spring has to absorb the hammer then close against any pressure the spring is still exerting.

Then there's the air pressure effects as well on the valve opening and closing to consider.

I suspect there is something in tuning springs for their consistency that might make guns perform more consistently at different preloads...

[Aeroman]

Getting the hammer weight and spring preload right will affect (improve?) the power curve on a self regulating knock open system, but they would also at a guess need balancing with the transfer port aperture which will also affect any rifle without a second chamber.

[RobF]

I was thinking that even with a reg, it's still down to hammer/knock open valve consistency...