There are those on here that know a lot more about this than me and it is a long time since i went into a s200. my thoughts are that normally with a 180 bar fill that pressure is being overcome by a strong firing valve spring sealing the firing valve, now the reg is there and the pressure delivered to the firing valve is 95 bar then the firing valve spring is too strong and the hammer spring is working too hard to overcome that tension. When i set up a Steyr it's about the balance of reg pressure vs firing valve spring vs hammer spring, i think that's your problem. see if you can find a 'softer' hammer spring or contact the reg supplier as he must have had this question before?
Chairman Emley Moor F.T.C. 2023 - Misfits champ, HFT extreme champ, NEFTA hunter champ, Midlands Hunter champ, UKAHFT champ.
https://sites.google.com/site/emleymoorftc/contact-us
Thanks ChrisC.
I understand the aim here now. The trick however must be knowing how to interpret results in relation to adjustments made and thats where my inexperience lets me down.
Wouldn't it be possible for suppliers to offer balanced firing valve and hammer springs matched to the pressure setting of the regulator they sell? Would be too easy I suppose
on a slight cautionary tangent, have you tried chrono'ing with another pellet?
reason I ask, is that from my understanding of some previous threads superfields can measure low on a chrono, meaning that if you try with jsb's and their ilk you will measure substantially over, you might decide to wind the power down a tad
Thanks for this info.. Not tested with anything other than Superfields at the moment. Only reason I went for these is that the previous owner said the gun preferred them. I have got AA fields, JSB exacts and Soverieign Rangemasters waiting in the wings. I'll look at trying these out later but for now I'd like to concentrate on improving the shot count and consistency. Once I'm there or thereabouts I'll go onto the other pellet types and check power is below FAC.
John.
Yes mate, you'd have thought that the reg supplier (if they had been contacted about this before) would have put together a small kit to make it an easy, DIY job. I mean, they must have experimented with the settings before making a product to sell?
To revert back to Steyrs. The newer models had an external power adjuster that meant an allen key could be used to push the power above the limit. Steyr in thier wisdom introduced a transfer port with a reduced diameter. the problem was that the shot count almost halved with the (silver) port fitted and the firing valve spring,reg and hammer spring were out of balance. The hammer spring had to be wound right in to get the power to a useable level which meant that the hammer smashed into the friing valve which in turn bounced. The result was a much lower shot count, harsher firing cycle and a vastly reduced life for the internals.....not a clever solution.
I suspect that you've got something similar going on but i also think it should be an easy enough fix......someone on here (or the reg supplier) will have just the info you need....hopefully.
Chairman Emley Moor F.T.C. 2023 - Misfits champ, HFT extreme champ, NEFTA hunter champ, Midlands Hunter champ, UKAHFT champ.
https://sites.google.com/site/emleymoorftc/contact-us
IMPROVEMENT!.. but not there yet
After some helpful replies, info and advice from you guys today I went ahead with reducing the hammer spring tension. I wound the adjuster all the way out until the face was level with the breach block. Result as per below.
Air Arms S200 - .177
RWS Superfields - .177 8.4 Gn
Shot No: FPS Ft/Lb Pressure Check
1 782 11.42 190
2 784 11.49
3 786 11.53
4 780 11.35
5 780 11.35
6 781 11.39
7 785 11.51 180
8 785 11.51
9 784 11.46
10 791 11.67
11 784 11.46
12 785 11.51
13 790 11.65
14 790 11.65 170
15 793 11.75
16 788 11.60
17 791 11.67
18 786 11.83
19 790 11.65
20 788 11.58
21 788 11.58 160
22 789 11.63
23 791 11.67
24 786 11.53
25 788 11.60
26 788 11.60
27 782 11.42
28 784 11.49 150
29 790 11.65
30 784 11.49
31 786 11.53
32 790 11.65
33 788 11.58
34 791 11.67
35 788 11.60 140
36 786 11.53
37 781 11.39
38 784 11.49
39 781 11.39
40 783 11.44
41 784 11.46
42 785 11.51 130
43 788 11.58
44 782 11.42
45 785 11.51
46 785 11.51
47 789 11.63
48 789 11.63
49 787 11.56 120
50 789 11.63
51 788 11.58
52 789 11.63
53 789 11.63
54 790 11.65
55 795 11.79
56 792 11.72 110
57 792 11.72
58 794 11.77
59 790 11.65
60 787 11.56
61 790 11.65 100
What should I do next as shot count still not as high as I expected (60 fish total). Should I increase the firing valve spring tension slightly and should this then reduce air usage / increase shot count? Or.. do I start looking for a shorter than standard hammer spring? OR... is it 'suck it and see'
I'm also a little worried about power spikes especially when you look at those recordd at 110 bar and below. What is this telling me? power creeps up the closer the internal air pressure is to the regulator pressure setting?
All comments / advice will be gratefully received.
John
PS.
Sorry for the jumbled up data. There doesn't seem to be a way of importing / inserting a table.
The "spike" at 110 bar is when it's coming off the reg , the gun settings you've got at the moment are working at their most efficient meanjng the reg is set a touch too high you get a few higher power shots then it drops right off.
Turn it down just a very small amount then do another string and see what that gives you. When you get a flat string you're at optimum reg pressure then you can start altering the other bits to get the power you want from that reg pressure
Don't understand what 'off the regulator' means.
Do you mean the reg is currently set higher than 95 bar (indicated on the reg body), and is closer to 110 bar?
What do you mean by a flat string... same FPS, no variation throughout the complete no' of test shots? Sorry if I seem thick
I was hoping I wouldn't have to touch the reg again. It's an internal reg and I hate pushing it past the internal cylinder threads. It's quite hard to push it past the threads and it feels like you're going to knacker the outer body 'o' ring on the reg. Ah well if needs must
OK spring length. ( new genuine.).
44.35mm.
1.746".
Cheers.
Geoff.
Following this with interest. Thanks guys.
I have a similar issue after fitting a Altoros reg to my cz 200.
Altoros advice me to adjust the 'striker spring' to the minimus. I assume they mean the hammer spring.
If I can get 60 shots and a plateau as above I will be very happy.
Cheers G
Isn't decreasing tension on the hammer spring the same as increasing firing valve spring tension? Doesn't it have the same effect?
Only problem is every gun even the same model can be slightly different. 400-500 users have it easier as if you're prepared to pay his price TR Robb sells a set a different hammer springs for them that you can experiment with. I managed to get set cheap off here a while ago which helped a lot but I did make some lighter, longer stroke hammers and different thickness spring preload spacers as well to mix and match until I got the optimum set-up. You could do worse than by checking Rob Lane's regulator YouTube videos there's one for every circumstance/problem. Not specific to the 200 but the principles are the same for every make of reg.