Skout Everything Skout EVO and Epoch

[Tricky-Dicky]

So far, I’ve only enlarged the high-pressure regular body. I’m a little chicken now that things are working so well…. I still may.. we’ll see

Yeah! I know what you mean, question how does your LP reg behave I know they take lots of winding to achieve any adjustment, but I am trying to find out just why mine seems to drop pressure when adjusted??

It seems that as such a low relative pressure is used to unbalance the valve the pressure is not that important, but I guess volume could be, but then would that necessitate upgrading the solenoid? Food for though.

 

[manabeknives]

Yeah! I know what you mean, question how does your LP reg behave I know they take lots of winding to achieve any adjustment, but I am trying to find out just why mine seems to drop pressure when adjusted??

It seems that as such a low relative pressure is used to unbalance the valve the pressure is not that important, but I guess volume could be, but then would that necessitate upgrading the solenoid? Food for though.

are the threads on the regulators dirty?..It might be possible that you are unscrewing the reg when adjusting. You won't completely unscrew it due to the retaining wire, but is can make a slight difference....just a thought

 

[Tricky-Dicky]

are the threads on the regulators dirty?..It might be possible that you are unscrewing the reg when adjusting. You won't completely unscrew it due to the retaining wire, but is can make a slight difference....just a thought

Unfortunately not, the adjuster cap will come off completely without removing the wire, and like I said on the sub 12 version the reg is deliberately not adjustable and lacks the plastic insert used, so I made one from delrin, wound in the adjuster by quite a few turns and all I saw was a slight drop in the pressure.

 

[Motorhead]

I am intrigued by the LP reg adjustment, so you have opened up the air paths in both regs now? And the final mod was to open up the spool valve poppet?

As my LP reg was not adjustable on the sub 12 version I did make an adjuster for it but found that winding it in did very little even after several turns, and it also seemed to reduce pressure rather than increase? Whether this is due to lower pressure in the HP reg making it not very responsive, I don't know?
My HP reg pressure sits around 1300psi and LP at 150psi this achieves my maximum allowed fps of 720 with a 10.34gr pellet but until I drilled out the poppet valve to 1mm the spread was always well over 10 fps now it stays around 10fps or lower.

The conclusions I draw from this is that although in theory small apertures are not a problem with HPA, but there is an application control it seems in the speed that the HPA can transfer so the aperture is a limiting factor, now I can understand this in relation to the poppet valve but not sure about the regs as the same?
Because of the speed of the air dump as the spool valve opens the poppet air feedback through the drilling is crucial to the speed of operation as the air is already leaving the gun behind the pellet and I suspect this is where calibre must come into it as this will also dictate the diameter and speed which the feedback closes the spool valve.

This is just my take on the way it works and could be completely wrong, as I am only just trying to learn the foibles of the system.

Your getting there
Yes indeed the orifice size within poppet head is crucial in getting a rapid closing cycle and is quite sensitive to pressure used in plenum, caliber which changes flow resistance, volume & time the available pressure within valves throat / transfer path can aid in this closing cycle.
There are many ways to word this same thing & thought I had eluded to this earlier in conversation

You guys are doing great BTW !!

 

[Tricky-Dicky]

Your getting there
Yes indeed the orifice size within poppet head is crucial in getting a rapid closing cycle and is quite sensitive to pressure used in plenum, caliber which changes flow resistance, volume & time the available pressure within valves throat / transfer path can aid in this closing cycle.
There are many ways to word this same thing & thought I had eluded to this earlier in conversation

You guys are doing great BTW !!

Can you give me your thoughts/knowledge on the way my LP reg is behaving?
And is the feed from the HP reg orifice controlled or just solely based on the HP reg pressure, IE because the HP pressure is low the resulting pressure available to is also limited.
If the LP reg pressure is the supply for the opening solenoid then increasing it can only have a limited effect on the opening speed as it's controlled by the electronic pulse/ dwell length and by its own orifice size and those between?

PS also have you tried increasing the poppet drilling size larger than 1mm? Once I get my spares, I will be giving it a go just out of curiosity.

 

[Motorhead]

Best I understand it, the LP reg is downstream of the HP reg & this is why that their design of how regs function, changes in HP also shifts LP.
The exact reason is outside my knowledge and would need to come from SKOUT.

I do have to tell you tho .... we who own these wonderful PCP's nearly all own them for the POWER then can produce in the various calibers generally .22 and greater. The extremely low power level your requiring and trying to figure out is for all but a few at the extreme opposing end of the typical users spectrum As such much that works for tuning at high power and massaging better than delivered efficiency, we end users have no idea w/o much R&D on porting / jet sizes / pressures and the whole enchilada of perimeters that one might investigate becomes a guessing game for extreme low power application.

I did a lot of it on the high power side over 2 years ago finding the improvements wanted utilizing several years of past experience with balanced valves using a pressure feed back poppet closing designs. That gave me a huge leg up on most who would or will venture into the R&D of said designs.

** We learned very quickly that "Balanced Valve Designs" as we call them where no where near ideal in low power applications being too dang hard the get them to accurately meter there discharge volume be it lift or open dwell control.
It is pretty much known in the world of AG tuners who work with Balanced valves or a Spool valves in a PCP air rifle, that .... there bias is High output !! And the higher the output the more linear there power seems to be once your in the meat of where these valve perform best. Drop to a low power use a conventional knock open poppet type valve is far more consistent and reliable .... in My Opinion