adjusting regulators

[mclaub]

If a regulator is adjusted to expel less air (lower FPS), does that mean the air gun will get more shots per fill?

 

[zx10wall]

Assuming that it is tuned correctly and you have a strong enough valve-return spring in use, then yes.

 

[tibor]

turning down on a impact or crown...Clockwise?

accomplished by shooting a round and keeping finger on trigger and adjust clock wise ..to tune down?

 

[Motorhead]

If a regulator is adjusted to expel less air (lower FPS), does that mean the air gun will get more shots per fill?

NOPE ! not necessarily. Pending where the HST is set and hammer weight & stroke has the gun currently running will be the determining factor.

What we call the "BELL CURVE" is the ideal peak of operation when the available hammer / spring energy can open the valve optimally. Being the valves poppet open HARDER in greater pressure and EASIER at lower pressure, changing the pressure on the REG will have an effect and shift where the ideal "Bell Curve Hammer/ spring strike becomes optimal.

Now IF your current tune has TOO HIGH of a regulator set to hammer strike , a lower reg pressure you will see a RISE in speed and you then can reduce HST reducing the speed to where previous and likely will get more shots.

If your current reg pressure is TOO LOW for the hammer strike, your already over dwelling the valve and using more air than required ... taking the pressure down lower yet you will only use MORE air.



Ideally you need to find at WHAT PRESSURE & HST you hit your targeted pellet speed ? ... that known you set the reg to that pressure and leave HST right there ... WALA a stable and consistent shooting PCP.



This test easily done if having an external adj reg ... OR by filling AG's tank in incremental amounts say stating at @1000 psi and fill in 100 psi steps shooting over a chrony.

You will see a trend in speed / pressure and if you see a peak before you get to the pressure you know regs set at and achieve the desired speed too, you know regs set to high.

IF you see speed keep climbing all the way to current regulator set point and don't get the speed your after, You can try adding HST first, and if it does not raise the speed enough you simply need a higher set point.



There's more here such as spring rates and hammer weights than may or may not be sufficient for the job .. but that's advanced tuning & modifications that we won't get into here.



HOPEFULLY what was stated helps you understand cause & effect within a conventional PCP valve. * NOT a JSAR balanced / Cothran etc ....



Scott S

 

[mclaub]

Thanks, fellows. There is a wealth of knowledge and willingness to share it on this site. 

I must admit the technology behind air guns is intimidating, especially when you consider the high pressures on the inside!