GTA
All Springer/NP/PCP Air Gun Discussion General => PCP/CO2/HPA Air Gun Gates "The Darkside" => Topic started by: Motorhead on February 12, 2022, 07:55:58 PM
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* Please don't clutter this thread with random chatting ... stay on subject so ALL can utilize this resource effectively. Thank you !
If others have information, data etc feel free to add it to this thread.
FOR CONVERSATION ON CONTENTS OF THIS THREAD ... Please openly converse here: [/b]https://www.gatewaytoairguns.org/GTA/index.php?topic=196353.msg156286643#msg156286643 (https://www.gatewaytoairguns.org/GTA/index.php?topic=196353.msg156286643#msg156286643)
Notes go with picture sequence best we can ...
Aircuda Max in .22 cal with a JTS 4-16x50 FFP scope ...
Trigger unit removed, side plate removed showing the internals. * While it has the geometry of a 2 stage, it does not operate as one ... But a 1 stage with adjustable sear overlap and free play seeming like a 1st stage ( But is not )
AS VIEWED ... On far LEFT where spring sits on intermediate link, there is a 1.5mm set screw that adjusts Sear overlap. The second 1.5mm screw on trigger blade ONLY adjusts the free travel before sear is contacted by trigger blade.
Barrel removed showing it THREADS into receiver with shroud mount also threaded acting as a jam nut to secure it firmly. Metal baffles stack up against a semi-square air diverter at muzzle so air get into shroud.
* Make note the BRASS thimble "IS NOT Clockable " it to is threaded on. One must be VERY CAREFULL when R&R of barrel to make sure the Bridged transfer ends up being pointed down. A Dot of paint can help here a bunch !
Primary valve parts extracted ... Brass seat sits inside housing and poppet spring secured via a threaded cap ( You CAN change spring preload over a very broad range ) Plenum tube then screws on, followed by the Regulator tube where the Stainless Reg just slides in and rests on a machined shoulder. Gauge manifold fitting next for HPA and then primary air tube.
* To adjust regulator you simply loosen the provided Bleed screw on left side below Plenum pressure gauge and dump all the air ... SLICK !! Then unscrew the primary air tube forward of HPA gauge, insert a 3mm allen in adjustment bonnet of reg, adjust and reassemble ... Rinse and repeat until at wanted pressure. easy peezy 8)
Bottom view of the air tube / valve / hammer / trigger block. To REMOVE upper receiver from lower .... Fill cap and barrel band off, Remove HST adjuster / spring and pull it out. Remove 2 screws on trigger assembly. Single screw
in rearmost hole behind trigger, 4 screws on forward valve block by plenum pressure guage, 2 screws in Magazine area ( 7 total ). Have cocking lever out @ 1/2 way so the spring detent plunger & spring don't fly out !! Lift the 2 half apart. WaLa ;D
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Doing some MODS .. or add-on was to get the .25 cal to power up w/o resorting to more hammer spring. SO ... we added a small BRASS weight of @ 13 grams putting it in against hammer with spring on top ( Total hammer weight now @36 grams. ) Raised reg pressure to @ 155bar and we're making 50 ft lbs with JSB 25.4 kings @ 942 fpe and with 33.95 heavy @ 832 fps at 52.2 fpe maxed out. Not too shabby for a carbine, not bad at all !
O' near forgot ::) How the .22 MAX shooting ... well detuned for some FT duty regulator at 100bar and set to the HST being right on the bell curve. Crosman Dome 14.3 with 10 shots at 50 yards !! Yea its a shooter !!
As a note of smoothing it up a tad, did remove hammer and scrubbed it down with 600 wet/dry. The surface finish was very smooth but had bulk part pile micro frets here and there. All shined up smooth as glass.
Little bit of LIGHT machine oil on hammer, cocking pivots etc. Gun was clean as heck, but not seeing much in factory lubrication present.
Out on the end of Shroud, when you remove the 1/2-20 LDC mount, you will see this threaded cover that has 2 spanner holes. It places the Baffles in compression when tightened having no rattles of looseness. Once srouds screwed on snug, stack in the baffles in correct orientation and snug down the retention cover, replace LDC mount and done. * It does screw on down @ 1/2" deep.
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Scott, it appears as if the plenum is its' own section? If so, could a plenum section/longer plenum simply be screwed on to increase volume? Adding the same length as a suppresor would maintain the lines.
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By design correctly made ... longer or shorter. Tho don't expect JTS to offer one. These are quality economy air rifles first and foremost. As stated on other threads if an after market parts market develops it will be done within the private sector of air gun hobbyists as stated by Travis at JTS.
Scott, it appears as if the plenum is its' own section? If so, could a plenum section/longer plenum simply be screwed on to increase volume? Adding the same length as a suppresor would maintain the lines.
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Another little snippet for those who may feel the "Need for Speed" and in that thought wonder what the Valve and transfer porting size is ?
BOTH the .22 & .25 are using the same valve housing and it has a massive @ .215" transfer path as does the receiver that matches up to it.
The brass Valve SEAT differs in only transfer exit size. THROAT on each @ .236" ( 6mm ) using a Acetal looking poppet of @ .315" diameter with a .118" ( 3mm) stem.
IIRC the .22 valve body transfer passage exited at @ .165" where the .25 exited at @ .195" .... AGAIN into a .215" transfer path to the barrel.
Is there room to open things up further ? Appears to be, tho for a .25 cal a .215" transfer is sufficient ++ and bore spec for a .22 cal, so no need there what so ever !!
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Another little snippet for those who may feel the "Need for Speed" and in that thought wonder what the Valve and transfer porting size is ?
BOTH the .22 & .25 are using the same valve housing and it has a massive @ .215" transfer path as does the receiver that matches up to it.
The brass Valve SEAT differs in only transfer exit size. THROAT on each @ .236" ( 6mm ) using a Acetal looking poppet of @ .315" diameter with a .118" ( 3mm) stem.
IIRC the .22 valve body transfer passage exited at @ .165" where the .25 exited at @ .195" .... AGAIN into a .215" transfer path to the barrel.
Is there room to open things up further ? Appears to be, tho for a .25 cal a .215" transfer is sufficient ++ and bore spec for a .22 cal, so no need there what so ever !!
The standard is limited to a smaller port due to the adjuster but that is very impressive on the max.
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Looks like the barrel port is on that brass piece.
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Looks like the barrel port is on that brass piece.
As travis called it "Thimble" ... yes its the two side by side ( Bridged ) slots.
*I suggested a change in this configuration to a full radial slot and 3-4 transfer holes such as XISICO did previous ... it would allow full barrel clocking and ease MAG gap adjustments. ??? We'll see ???
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More MEASURED to confirm DATA on Air Tube Volume / Plenum Volume & @ Total
Has been factory stated the MAX carries approximately 220cc of air :-\ So where is it all at and what of it can we actually use while being on the regulator ?
Running the numbers on a CC volume calculator we get:
HPA main tank @ 186cc
Reg Manifold & Fill manifold space @ 8.84cc
* Total HPA storage @ 194.84cc
Plenum numbers we get @ 21.1 cc
Valve body / area above poppet @ 4cc
* Total plenum @ 25.1cc
My numbers confirm @ 219.94cc min ( likely a tad more in valve body ... so ) ... ;) Yes indeed there is @ 220 cc of air on board.
Scott S
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Looks like the barrel port is on that brass piece.
As travis called it "Thimble" ... yes its the two side by side ( Bridged ) slots.
*I suggested a change in this configuration to a full radial slot and 3-4 transfer holes such as XISICO did previous ... it would allow full barrel clocking and ease MAG gap adjustments. ??? We'll see ???
That's a better idea I think for the ports, I'm really not a fan of the barrel being choked either, in my opinion that's a lame way of making different pellets shoot good, if the pellets are good pellets they should shoot good from an unchoked barrel. Slower twist rate should work better with pellets as well.
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Not that my confirmation is required for your data to be relevant but thank you Scott for posting your findings as they mirror mine exactly. I will try my best to post any and all technical finding here in this thread in an attempt to consolidate the data.
I am thoroughly impressed with the consistency of these PCP's and your data does nothing but elevate my positive impression of the workmanship on these units.
If the factory continues to build the future units to these specs, there will be very little for end-users to complain about.
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Short stiff spring all else bone stock. Ill tune it to 3 power levels with same spring.
Created: 16/02/22 03:19 PM
Description: Airacuda MAX 25
Notes 1: Cuda MAX
Notes 2: heavy short spring
Distance to Chrono(FT): 1.00
Ballistic Coefficient: 1.000
Bullet Weight(gr): 25.00
Temp: 69 °F
BP: 1012.00 inHg
Altitude: 0.00
# FPS FT-LBS PF
46 838 38.99 20.95
45 838 38.99 20.95
44 842 39.36 21.05
43 845 39.64 21.12
42 846 39.74 21.15
41 847 39.83 21.17
40 847 39.83 21.17
39 846 39.74 21.15
38 848 39.93 21.20
37 840 39.18 21.00
36 842 39.36 21.05
35 839 39.08 20.98
34 841 39.27 21.02
33 845 39.64 21.12
32 839 39.08 20.98
31 847 39.83 21.17
30 843 39.46 21.08
29 842 39.36 21.05
28 840 39.18 21.00
27 842 39.36 21.05
26 840 39.18 21.00
25 848 39.93 21.20
24 845 39.64 21.12
23 839 39.08 20.98
22 840 39.18 21.00
21 840 39.18 21.00
20 835 38.71 20.88
19 846 39.74 21.15
18 842 39.36 21.05
17 845 39.64 21.12
16 841 39.27 21.02
15 839 39.08 20.98
14 843 39.46 21.08
13 839 39.08 20.98
12 845 39.64 21.12
11 838 38.99 20.95
10 847 39.83 21.17
9 841 39.27 21.02
8 840 39.18 21.00
7 834 38.62 20.85
6 844 39.55 21.10
5 844 39.55 21.10
4 841 39.27 21.02
3 841 39.27 21.02
2 842 39.36 21.05
1 837 38.90 20.92
Average: 842.0 FPS
SD: 3.4 FPS
Min: 834 FPS
Max: 848 FPS
Spread: 14 FPS
Shot/sec: 0.1
True MV: 842 FPS
Group Size (in): 0.00
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Short stiff spring all else bone stock. Ill tune it to 3 power levels with same spring.
Created: 16/02/22 03:19 PM
Description: Airacuda MAX 25
Notes 1: Cuda MAX
Notes 2: heavy short spring
Distance to Chrono(FT): 1.00
Ballistic Coefficient: 1.000
Bullet Weight(gr): 25.00
Temp: 69 °F
BP: 1012.00 inHg
Altitude: 0.00
# FPS FT-LBS PF
46 838 38.99 20.95
45 838 38.99 20.95
44 842 39.36 21.05
43 845 39.64 21.12
42 846 39.74 21.15
41 847 39.83 21.17
40 847 39.83 21.17
39 846 39.74 21.15
38 848 39.93 21.20
37 840 39.18 21.00
36 842 39.36 21.05
35 839 39.08 20.98
34 841 39.27 21.02
33 845 39.64 21.12
32 839 39.08 20.98
31 847 39.83 21.17
30 843 39.46 21.08
29 842 39.36 21.05
28 840 39.18 21.00
27 842 39.36 21.05
26 840 39.18 21.00
25 848 39.93 21.20
24 845 39.64 21.12
23 839 39.08 20.98
22 840 39.18 21.00
21 840 39.18 21.00
20 835 38.71 20.88
19 846 39.74 21.15
18 842 39.36 21.05
17 845 39.64 21.12
16 841 39.27 21.02
15 839 39.08 20.98
14 843 39.46 21.08
13 839 39.08 20.98
12 845 39.64 21.12
11 838 38.99 20.95
10 847 39.83 21.17
9 841 39.27 21.02
8 840 39.18 21.00
7 834 38.62 20.85
6 844 39.55 21.10
5 844 39.55 21.10
4 841 39.27 21.02
3 841 39.27 21.02
2 842 39.36 21.05
1 837 38.90 20.92
Average: 842.0 FPS
SD: 3.4 FPS
Min: 834 FPS
Max: 848 FPS
Spread: 14 FPS
Shot/sec: 0.1
True MV: 842 FPS
Group Size (in): 0.00
WOW !!!
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Short stiff spring all else bone stock. Ill tune it to 3 power levels with same spring.
Created: 16/02/22 03:19 PM
Description: Airacuda MAX 25
Notes 1: Cuda MAX
Notes 2: heavy short spring
Distance to Chrono(FT): 1.00
Ballistic Coefficient: 1.000
Bullet Weight(gr): 25.00
Temp: 69 °F
BP: 1012.00 inHg
Altitude: 0.00
# FPS FT-LBS PF
46 838 38.99 20.95
45 838 38.99 20.95
44 842 39.36 21.05
43 845 39.64 21.12
42 846 39.74 21.15
41 847 39.83 21.17
40 847 39.83 21.17
39 846 39.74 21.15
38 848 39.93 21.20
37 840 39.18 21.00
36 842 39.36 21.05
35 839 39.08 20.98
34 841 39.27 21.02
33 845 39.64 21.12
32 839 39.08 20.98
31 847 39.83 21.17
30 843 39.46 21.08
29 842 39.36 21.05
28 840 39.18 21.00
27 842 39.36 21.05
26 840 39.18 21.00
25 848 39.93 21.20
24 845 39.64 21.12
23 839 39.08 20.98
22 840 39.18 21.00
21 840 39.18 21.00
20 835 38.71 20.88
19 846 39.74 21.15
18 842 39.36 21.05
17 845 39.64 21.12
16 841 39.27 21.02
15 839 39.08 20.98
14 843 39.46 21.08
13 839 39.08 20.98
12 845 39.64 21.12
11 838 38.99 20.95
10 847 39.83 21.17
9 841 39.27 21.02
8 840 39.18 21.00
7 834 38.62 20.85
6 844 39.55 21.10
5 844 39.55 21.10
4 841 39.27 21.02
3 841 39.27 21.02
2 842 39.36 21.05
1 837 38.90 20.92
Average: 842.0 FPS
SD: 3.4 FPS
Min: 834 FPS
Max: 848 FPS
Spread: 14 FPS
Shot/sec: 0.1
True MV: 842 FPS
Group Size (in): 0.00
So what the starting psi and end psi on the tank.
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Here you go.
2022-02-16 | 22:44:01 mtn
avg FPE/cuin per shot
1.68
avg bar-cc/FPE per shot
9.8
avg FPE per shot
40
avg PSI used per shot
30
For your records when printing:
Airgun
Barrel length
Type of pellet
Notes
Prints entire screen in black and white
PCP Air Efficiency Calculator
PSI before first shot
3400
Enter an integer from 1000 to 5000
PSI after last shot
2000
Enter an integer from 200 to 5000 which is less than the first PSI
Gun tank volume in cc
186
Enter an integer from 1 to 20000
Pellet weight
25.4
Enter an integer or decimal number from 2.1 to 1000
Total number of shots
46
Enter an integer from 1 to 500
Average FPS for all the shots
842
Enter an integer from 100 to 1500
Want to keep some of your previous data? Don't clear.
Just change the other fields and click Calculate again.
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Not that my confirmation is required for your data to be relevant but thank you Scott for posting your findings as they mirror mine exactly. I will try my best to post any and all technical finding here in this thread in an attempt to consolidate the data.
I am thoroughly impressed with the consistency of these PCP's and your data does nothing but elevate my positive impression of the workmanship on these units.
If the factory continues to build the future units to these specs, there will be very little for end-users to complain about.
Look forward to seeing your impression of the workmanship.
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Airacuda Max .22 SSSpring shooting in warehouse at 40F all 55 shots at 30 yards can be covered with nickel
Created: 18/02/22 11:27 AM
Description: JTS Cuda .22
Notes 1: Heavy spring
Notes 2: 3500-1900
Distance to Chrono(FT): 3.00
Ballistic Coefficient: 1.000
Bullet Weight(gr): 18.00
Temp: 45 °F
BP: 1026.00 inHg
Altitude: 0.00
# FPS FT-LBS PF
55 919 33.76 16.54
54 922 33.98 16.60
53 921 33.91 16.58
52 924 34.13 16.63
51 920 33.83 16.56
50 920 33.83 16.56
49 919 33.76 16.54
48 919 33.76 16.54
47 921 33.91 16.58
46 921 33.91 16.58
45 921 33.91 16.58
44 920 33.83 16.56
43 924 34.13 16.63
42 923 34.06 16.61
41 921 33.91 16.58
40 923 34.06 16.61
39 919 33.76 16.54
38 924 34.13 16.63
37 921 33.91 16.58
36 921 33.91 16.58
35 921 33.91 16.58
34 921 33.91 16.58
33 921 33.91 16.58
32 920 33.83 16.56
31 923 34.06 16.61
30 921 33.91 16.58
29 919 33.76 16.54
28 921 33.91 16.58
27 921 33.91 16.58
26 921 33.91 16.58
25 928 34.43 16.70
24 921 33.91 16.58
23 924 34.13 16.63
22 924 34.13 16.63
21 923 34.06 16.61
20 927 34.35 16.69
19 926 34.28 16.67
18 923 34.06 16.61
17 926 34.28 16.67
16 922 33.98 16.60
15 929 34.50 16.72
14 925 34.20 16.65
13 924 34.13 16.63
12 923 34.06 16.61
11 924 34.13 16.63
10 923 34.06 16.61
9 919 33.76 16.54
8 920 33.83 16.56
7 927 34.35 16.69
6 923 34.06 16.61
5 921 33.91 16.58
4 925 34.20 16.65
3 926 34.28 16.67
2 928 34.43 16.70
1 928 34.43 16.70
Average: 922.6 FPS
SD: 2.7 FPS
Min: 919 FPS
Max: 929 FPS
Spread: 10 FPS
Shot/sec: 0.0
True MV: 923 FPS
Group Size (in): 0.00
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https://www.instagram.com/p/CaINUa1uKU0/ (https://www.instagram.com/p/CaINUa1uKU0/)
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Another tuning method that works on both the Standard and MAX is the valve return spring has a long threaded retainer that can be adjusted for more power or a tighter ES.
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Airacuda Max .22 SSSpring shooting in warehouse at 40F all 55 shots at 30 yards can be covered with nickel
Created: 18/02/22 11:27 AM
Description: JTS Cuda .22
Notes 1: Heavy spring
Notes 2: 3500-1900
Distance to Chrono(FT): 3.00
Ballistic Coefficient: 1.000
Bullet Weight(gr): 18.00
Temp: 45 °F
BP: 1026.00 inHg
Altitude: 0.00
# FPS FT-LBS PF
55 919 33.76 16.54
54 922 33.98 16.60
53 921 33.91 16.58
52 924 34.13 16.63
51 920 33.83 16.56
50 920 33.83 16.56
49 919 33.76 16.54
48 919 33.76 16.54
47 921 33.91 16.58
46 921 33.91 16.58
45 921 33.91 16.58
44 920 33.83 16.56
43 924 34.13 16.63
42 923 34.06 16.61
41 921 33.91 16.58
40 923 34.06 16.61
39 919 33.76 16.54
38 924 34.13 16.63
37 921 33.91 16.58
36 921 33.91 16.58
35 921 33.91 16.58
34 921 33.91 16.58
33 921 33.91 16.58
32 920 33.83 16.56
31 923 34.06 16.61
30 921 33.91 16.58
29 919 33.76 16.54
28 921 33.91 16.58
27 921 33.91 16.58
26 921 33.91 16.58
25 928 34.43 16.70
24 921 33.91 16.58
23 924 34.13 16.63
22 924 34.13 16.63
21 923 34.06 16.61
20 927 34.35 16.69
19 926 34.28 16.67
18 923 34.06 16.61
17 926 34.28 16.67
16 922 33.98 16.60
15 929 34.50 16.72
14 925 34.20 16.65
13 924 34.13 16.63
12 923 34.06 16.61
11 924 34.13 16.63
10 923 34.06 16.61
9 919 33.76 16.54
8 920 33.83 16.56
7 927 34.35 16.69
6 923 34.06 16.61
5 921 33.91 16.58
4 925 34.20 16.65
3 926 34.28 16.67
2 928 34.43 16.70
1 928 34.43 16.70
Average: 922.6 FPS
SD: 2.7 FPS
Min: 919 FPS
Max: 929 FPS
Spread: 10 FPS
Shot/sec: 0.0
True MV: 923 FPS
Group Size (in): 0.00
JEEPERS!
TAKE MY MONEY!!
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Shooting my MAX.22 last weekend for some Field Target trials it had some POI / POA shifts that only showed up with some precision shooting.
Now understand I've taken rifle apart, shroud & barrel out etc ... So, may not have assembled correctly to a specification i simply am not aware of .
To tight on securing baffles, wrong toque on barrel nut etc ... really don't know ???
Coming back home looking over the set up, figured why not just float the barrel removing barrel band, remove the baffles all together and let the POI become uninfluenced from how assembled along with barrel band.
Lathe turned a collar to replace barrel band out of black delrin and here is what we got. It is in it's current to past set up exhibiting increased constancy / accuracy overall.
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Shooting my MAX.22 last weekend for some Field Target trials it had some POI / POA shifts that only showed up with some precision shooting.
Now understand I've taken rifle apart, shroud & barrel out etc ... So, may not have assembled correctly to a specification i simply am not aware of .
To tight on securing baffles, wrong toque on barrel nut etc ... really don't know ???
Coming back home looking over the set up, figured why not just float the barrel removing barrel band, remove the baffles all together and let the POI become uninfluenced from how assembled along with barrel band.
Lathe turned a collar to replace barrel band out of black delrin and here is what we got. It is in it's current to past set up exhibiting increased constancy / accuracy overall.
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Did some fooling around with a lead given by Travis W .... SSS AKA: Short Stiff Spring
In the .22 and .25 MAX's, No added weights just a spring change to a .070 wire 3.25" long spring.
In both cases spring was in free flight being @ shy of compression by @ 1/8" Shot cycle a Crisp SNAP !!! no audible hammer bounce and much quieter too.
* Now said .... degrees of rotation on HST screw very sensitive in changing speed. While not a Precision / Target shooters soft adjustment, it does prove these easy Light hammer models can do very well with some minor tweaks applied.
Scott s
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Both the MAX .22 & .25 now fitted with "Cobra Tech Valves"
This being air assist closing while poppet also being now PEEK.
Speeds up the closing cycle even more and chops peak power potential ... I'm more a MAX efficiency guy so long as able to make the peak power wanted.
The .22 as currently tuned at 20 fpe ( Crosman dome @ 810fps ) liked the chamber vent at .055" where as the .25 is at .070" on vent and honestly could use a tad bit larger. It is running at 875fps with 25.4 kings tho HST is a tad more than required previous pre-cobra. Got some tuning to do yet on the .25 .. tho is really quite and snappy shooting as set up.
Scott S
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I bet that thing is super quiet!!! Love to see a shot string when your done.
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Making quieter yet ... No longer ANY mechanical TINK of hammer striking poppet stem !
In LATHE with a 3/16" carbide 2 flute end mill placed a .100" pocket in hammer face, then pressed in a PEEK insert.
Mechanically near silent now, only some muzzle report. ( Tho even less now with an added 3D printed LDC )
Scott S
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SAWEET! ;D
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Whats the hammer weight?
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For technical purposes: What is the actual bore diameter of both the .22 and the .25?
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For technical purposes: What is the actual bore diameter of both the .22 and the .25?
X2
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For technical purposes: What is the actual bore diameter of both the .22 and the .25?
X2
Rifles are assembled and shooting ... so no clue.
Tho BOTH when they were apart and having barrels cleaned up, pushing pellets threw both had them on the money size wise pushing JSB's threw them. There not over or undersized best as I did note during this process.
Scott S
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I have a question.. Since the "Standard" Airacuda has an adjustable transfer port. why would they not build the Airacuda Max using the same receiver..?
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I have a question.. Since the "Standard" Airacuda has an adjustable transfer port. why would they not build the Airacuda Max using the same receiver..?
Well .... one reason being the "Strangle" adjuster of the standard is only .165" I.D. This for an UN-regulated .22 or .25 is about perfect.
On the MAX the transfer path is a huge @ .215" IIRC all the way threw valve to barrel.
Even if it fit, doing so would Tune Down the power limit of the max quite a bit and those seeking big power would be looking for a work around of the TOO SMALL and low flow strangle adjuster. :P :P :P
JMO ...
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Also the strangle adjuster is there to help flatten the curve because the gun is unregulated, with a regulated gun you can just turn the hammer strike down or up.
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Self contained SSG devise ...
Found to work a tad better for tighter ES values that a SSS set up.
Done for both a standard as well Max giving equally good results.
Base line was a .063 wire spring at 3 1/2" long x .500 diameter.
* Pending reg set point, your guns hammer weight ... adjust accordingly
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The Cuda and Max in .22 have arrived in Katy, llok for them to be listed on sites in a week or so...FDAR will not be carrying them...
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Hey Scott, Just wondering if the barrel easy to remove?
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Hey Scott, Just wondering if the barrel easy to remove?
Not really ... EARLY RIFLES .. ** Not seen the current revision models **
Barrel at breech end has TWO sets of threads, one having the brass thimble being screwed on. Second threading is for the breech fitment having actual barrel threading into the breech block,.
Thimble clocked correctly a Large Jam Nut locks it down. This Jam nut is also the rear shroud mount.
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POWER HOUSE MODS to the MAX !!!
Could not leave the .22 Max alone.
This platform has SOOOOO much potential to screw around with having a large valve and space around it, generous plenum and a fantastic regulator etc ...
Having just a couple JSAR pre-drilled poppet stems left in my stash, Made up a custom Balanced valve following my previous inverted chamber architecture.
This .22 MAX has been slightly modified previously having the valve seats throat reamed to .250" I.D and exit port matched to the .215" transfer path. So it breaths very well downstream from valve !!
Poppet head which also has the balance chamber portion was machined from PEEK having an O.D. of .320" and chamber diameter of @ .200" which left us with @ .063" wall thickness.
* Have made several to this specification having used them now for over a year w/o any signs of crush or collapse issues.
Venting threw poppet head was kept rather small at @ .042", which can be made larger is finding the need for a faster closing speed ??? Using the Very light OEM hammer and OEM spring within an SSG the mass & momentum of opening valve is already really low and valve appears to be slamming closed fast enough. Muzzle report a stick snapping CRACK !
Played with regulator set point up/down from @ 100 to 140 bar finding @ 120 bar to be a good sweet spot being barrels @ 17" length and only 200cc of air to play with ::)
RESULTS AS SET ....
JSB Hades 15.9 = 980 fps @ 33.9 fpe
JSB Heavy 18.1 = 935 fps @ 35.13 fpe
NSA Slug 20.2 = 875 fps @ 34.33 fpe
With OEM spring it cocks 1 finger easy and trigger sears have minimal load on them ... Now we just shoot it and see how it holds up, see if we get any valve sticking etc ... It's accuracy is already proven !!
No pics ... Those who know how these Balanced valve look ... nothing special here, just purpose built.
Scott S
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Exploded diagrams with o-ring sizes now on website under manuals
https://static1.squarespace.com/static/621fcd748d0911333b1ef4cf/t/6375435fcaff5e22a7a9556e/1668629345758/MANUAL+JTS+Airacuda+PCP+Air+Rifle+24MAR22+PRINT-merged.pdf?fbclid=IwAR1f96bs7bcqgf0t-LahTA4ukHqQQ-i-1dftfixtfNvPcrBm-kLB09___4Y
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Exploded diagrams with o-ring sizes now on website under manuals
https://static1.squarespace.com/static/621fcd748d0911333b1ef4cf/t/6375435fcaff5e22a7a9556e/1668629345758/MANUAL+JTS+Airacuda+PCP+Air+Rifle+24MAR22+PRINT-merged.pdf?fbclid=IwAR1f96bs7bcqgf0t-LahTA4ukHqQQ-i-1dftfixtfNvPcrBm-kLB09___4Y
Thank you sir!
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POWER HOUSE MODS to the MAX !!!
Could not leave the .22 Max alone.
This platform has SOOOOO much potential to screw around with having a large valve and space around it, generous plenum and a fantastic regulator etc ...
Having just a couple JSAR pre-drilled poppet stems left in my stash, Made up a custom Balanced valve following my previous inverted chamber architecture.
This .22 MAX has been slightly modified previously having the valve seats throat reamed to .250" I.D and exit port matched to the .215" transfer path. So it breaths very well downstream from valve !!
Poppet head which also has the balance chamber portion was machined from PEEK having an O.D. of .320" and chamber diameter of @ .200" which left us with @ .063" wall thickness.
* Have made several to this specification having used them now for over a year w/o any signs of crush or collapse issues.
Venting threw poppet head was kept rather small at @ .042", which can be made larger is finding the need for a faster closing speed ??? Using the Very light OEM hammer and OEM spring within an SSG the mass & momentum of opening valve is already really low and valve appears to be slamming closed fast enough. Muzzle report a stick snapping CRACK !
Played with regulator set point up/down from @ 100 to 140 bar finding @ 120 bar to be a good sweet spot being barrels @ 17" length and only 200cc of air to play with ::)
RESULTS AS SET ....
JSB Hades 15.9 = 980 fps @ 33.9 fpe
JSB Heavy 18.1 = 935 fps @ 35.13 fpe
NSA Slug 20.2 = 875 fps @ 34.33 fpe
With OEM spring it cocks 1 finger easy and trigger sears have minimal load on them ... Now we just shoot it and see how it holds up, see if we get any valve sticking etc ... It's accuracy is already proven !!
No pics ... Those who know how these Balanced valve look ... nothing special here, just purpose built.
Scott S
Is there a thread with pictures and diagrams of this valve and poppet mod?
Or could you make a rough drawing?
I love tinkering with these things but don't have a lathe so I'd have to submit plans to a shop....thanks Scott.
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Only built the one ... Nothing drawn up, just made it to fit.
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Only built the one ... Nothing drawn up, just made it to fit.
Dude
Please make me one.....PLEASE
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Issue ... sadly my stash of JSAR .125" predrilled valve stems that I had a few of are now exhausted.
Was a Great couple years of balanced valve R&D, that ship has sailed unfortunately.
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Issue ... sadly my stash of JSAR .125" predrilled valve stems that I had a few of are now exhausted.
Was a Great couple years of balanced valve R&D, that ship has sailed unfortunately.
Let me see if I can find one.
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They don't use this style poppet anymore they went with a single piece head and stem design.
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I detect some ill feelings and a trolling happening here ???
If we can't keep conversations ON-SUBJECT, please say nothing to side rail the subject at hand.
Thank you,
Scott S
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I truly apologize if this is not the place to put this, and if it needs moved, I fully understand.
I am not new to the pcp world, but I am new to the upper end of tuning etc...
I am currently working on a Airacuda max in .25 cal.
When I got the gun from my dealer the reg was set to 180 bar, and I would only get 12-15 shots according to the pressure gauges before it fell off the reg. I am currently set to about 140 reg, and have messed with the hammer spring all the way in and out. no matter what the max FPS has never been over 850. and I am no where near the 30+ claimed by the advertisements. I know claims don't always match actual performance, but shot count to me will always beat FPS. 2nd problem I am having is my 25 cal Donny fl yokozuna clips EVERY section, So I bought a 30 cal version, and it clips the last 3 sections of that one as well. Any one have suggestions?
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SEARCH is your friend !!
There is also a Face Book page for Airacuda owners if you do the FB thang :-\
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I've not been on here in a while and when I was a couple of weeks ago, it just happened that I reached out to Scott about his anti bounce device for the JTS Max
I come on today and see this thread at the top of the gate so figured I'd post what I've been up to.
I ended up not making the anti bounce and instead went the same route as the avenger and used a heavier, shorter spring as well as other improvements.
This is a .22
I've removed the body high pressure section of the air tube and the regulator. Made a new end cap and fitted a Huben Power Dream Valve, regulated drop block. I increased the internal diamater of the valve and transfer port. I made a Lothar Walther barrel and used the brass section from the OE barrel and increased the flow a little. Fitted a carbon shroud and made a new endcap / air stripper / moderator threads.
It's not tuned but set at 124 bar (1800psi) and shoots 18.3g JSB at 1065fps with about 1/8 free play on the hammer spring (no tension). Also after getting it on paper and turning down the reg it put 12 shots on a dime at 40 yards shooting this hot and the shooting setup was super sketchy.
I can't wait to see this in the stock witha. Bit of time spent actually tuning it.
No hammer bounce was heard with the setup I had.
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I keep getting notifications on replys to this thread, but haven’t been able to read anything new since Scott’s reply:
Re: JTS Aircuda Max .... TECHNICAL DATA & TUNING
« Reply #49 on: December 27, 2023, 18:53:07 »