I'm in AWE .... Jefferson State SS Gen II Balanced valve

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Motorhead

Motorhead

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Nov 1, 2018
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California, United States
Let me start by saying my little WAR WarP carbine has been taken apart tweaked and tuned more than any other PCP ever owned !! Has been set up in .177 / .20 / .22 / .25 calibers. Numerous variations of Crosman valves, WAR valves, SS gen 1 valves and many of those with "Cobra tech" air springs. Hammers from 80 grams to as light as @ 24 grams. Stroke taken from the full @ 1.400" down to minimal. Springs that were under tension to free flight, SSG devises & poppet height limiting strikers. More I'm sure
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Always running regulated, all but the SS Gen 1 valves worked well once you found the sweet spot pressure, hammer strike fiddling with springs hammer stroke & weight. A lot of darn tuning hours spent here !!!

Now comes along the Jefferson State SS Gen II balanced valve

After a few combos of light hammer and long stroke & soft spring, to heavy hammer short stoke and light spring, ended up really liking a *light hammer at intermediate stroke with a heavy spring best.
Note: all produced the same @ velocity, tho muzzle report was telling of what the dwell cycle was doing ... thus the last *combo above was deemed optimal.

As set up my little WarP carbine is wearing a 23" LW .22 caliber barrel and likely to stay there because it's just SWEET & O' so accurate even past 100 yards.

Using an SSG devise with a fairly heavy spring, fitted a Very light hammer having a total weight of just 26.5 grams with @ .050" of free flight at a stroke of @ .800" ( Yea pretty short stroke with a super light hammer )
Regulated it at 1800 PSI .

H&N BARRACUDA 21.1 grain pellets .... 1015 fps for over 48 ft lbs power !! Muzzle report sounds like a 12fpe .177 with an LDC being STUPID QUIET !!!
Shooting a few dozen shots the pressure gauge is barely moving down telling of the efficiency even at this very high power level.

Love it Love it love it !!!

Scott
 
Any idea of the current spring rating or have spring specification for the current setup? As much as I love balanced valves (even helping perfect their functionality via mass air flow and balance chamber fill time calculations), I don't see any benefit on small bores compared to a properly modified OEM valve, just my 2c.



Any idea of the balance ratio used for the chamber, or vent size? My last rendition of a balanced valve was 60% reduction / balance force with a .04" vent and .09~ cc chamber volume. 55 lbs of force holding valve closed, 76 lbs reduced, with a fill time for the balance chamber of less than .4 Millisecond...flawless operation yet not as efficient due to added wasted volume in the balance chamber, the .09 cc's of air that contributes to closing the valve doesn't aid in moving the pellet any faster...on lower power tunes the losses are more detrimental as the .09 cc waste is constant and not a variable such as air use with modified dwell/lift with hammer weight / spring variations.... .09 cc might not be much on a tune using 5 cc per shot but one using 2 cc per shot that is nearly 5% extra wasted air...resulting in 5% less shot count compared to a valve that operates without said balance chamber.



At the end of the day, is any aftermarket valve of any kind THAT much better than a modified stock valve? IMO, no...but I'll keep my eyes open for data that one days changes my mind on this matter.



-Matt


 
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Matt

I'm refusing to get into it with you and your CLAIM of helping JSAR develop this valve. YOU DID NOT and that's the end of that !

As to sharing specs and further info ... just to have you throw stones and get arrogant you know more than everyone else on the subject .. again going to pass !



Scott S
 
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