Choices choices…
Ok, my valve seems to be doing pretty good but the fps deviation is a tad more than I’d like (14fps). I’m getting similar upper-numbers from both of the following:
10mm of spacer with a 100g hammer.
17mm of spacers with a 50g hammer.
Which config would offer better long-term consistency do you think?
All Replies
31-grain Kodiaks.
Lang Valve.
24″ .25 BSA barrel.
Blod spring.
100g hammer.
17mm spacer.
and bump that fill psi up top 3200 and see how she flies….
If ya scared, say ya scared….lol
It’s the 6mm aperture Mam. First couple of hits it won’t open properly, then it goes completely the other way and opens right up, then drops pretty quickly as each shot eats air and empties the bottle. What I should really do is take the valve out again and fit a 5.5mm aperture, but I’m getting real tired of pumping the bottle from empty, it’s tedious as hell. 😆
There are so many possible combinations of settings and I guess I’ll just have to try them all before I’m done.
Man that is a hard one to figure out…..Sounds like it will give you either a
lot of power or a lot of shots..There has to be a middle ground there
somewhere…..
Carry on….
31-grain Kodiaks.
Lang Valve.
24″ .25 BSA barrel.
Blod spring.
100g hammer.
17mm spacer.
and bump that fill psi up top 3200 and see how she flies….
If ya scared, say ya scared….lol
It’s the 6mm aperture Mam. First couple of hits it won’t open properly, then it goes completely the other way and opens right up, then drops pretty quickly as each shot eats air and empties the bottle. What I should really do is take the valve out again and fit a 5.5mm aperture, but I’m getting real tired of pumping the bottle from empty, it’s tedious as hell. 😆
There are so many possible combinations of settings and I guess I’ll just have to try them all before I’m done.
Heck Lang….Use this setup
31-grain Kodiaks.
Lang Valve.
24″ .25 BSA barrel.
Blod spring.
100g hammer.
17mm spacer.
and bump that fill psi up top 3200 and see how she flies….
If ya scared, say ya scared….lol
If you take the tophat travel down that far, don’t you run the risk of hurting accuracy due to slamming the tophat into the valve? I seem to recall some issues in that regard…
Yeah, I thought of that. Also thought about how the valve won’t be able to supply more air as the pressure in the bottle decreases. But 1mm is a starting point and I’m hoping I’ll find a position where I’ll be able to get 20 good shots.
Maybe I’m expecting too much. The .25 needs a lot of air and it’s a small bottle for the job. But I’ll carry on messing with it until I get my regulator. If that comes to nothing I can go back to .22.
Cheers Jerry.
Lang,
If you take the tophat travel down that far, don’t you run the risk of hurting accuracy due to slamming the tophat into the valve? I seem to recall some issues in that regard…
I think this stuff is great. Whithin a week of getting my condor I started messing with things. I never would have messed with it had it not been for people like you paving the way. Within a month I dialed in my .22 extra heavy kodiacs just under the speed of sound. heaviest pellet with pretty close to the speed of sound and awesome accuracy. Oh do not forget a shroud so your gun is backyard freindly. What a great place to learn and play. I am too conservative to mess around myself , I watch and read.
It’s a quest for power and consistency. I had the .22 nailed, then I got sucked into the whole .25 gig by cheap barrels (and a relatively inexpensive opportunity to experiment and expand my skills).
I’m going to take the distance the tophat can travel down to 1mm (instead of what it is now, which is basically as far as the stem can go before it bottoms-out). Logically that should regulate things to a point.
You have way too much time on your hands and ideas too. LOL
can I ship you my condor and talon ss for some testing?
All kidding aside I find it amazing how much tinkering goes on with these guns. It is definetly cool how many ideas come off this site!
Ok, I have accurate numbers now:
3000psi fill to 2600psi, 17mm spacers with 60gr hammer:
924
995
989
1003
1059
1069
1068
1080
1055
1051
1041
Approx 36psi per shot.
———————————————————–
3000psi fill to 2500psi, 10mm spacer with 150gr hammer:
865
966
1004
1061
1083
1089
1080
1078
1071
1052
1050
Approx 45psi per shot.
1050
1037
1029
1016
————————————————————–
Those are pretty shite results, and I reckon they’re down to having a 6mm aperture. With a 5.5mm aperture I had a pretty consistent 20-shot string right from start to finish off a 3000psi fill.
Hopefully the 2000psi regulator I’m waiting on will make a difference. Probably regulate the FPS right down the crapper unless it’s volume is sufficient. I know 2000psi can do the speed, I had 950fps on a last shot (20th) with the 5.5mm aperrture and then checked the bottle which was at 2100psi.
Anyway, this data is for those of you who are interested in this shit. The rest of you can jog on. 😉 😆
20 shot string.
31-grain Kodiaks.
Lang Valve.
24″ .25 BSA barrel.
Blod spring.
150g hammer.
17mm spacer.
Started at 3000psi
Finished at 2100psi
5.5mm aperture.
1) 1017
2) 1009
3) 1018
4) 1021
5) 1014
6) 1003
7) 1007
8] 1004
9) 998
10) 995
11) 998
12) 996
13) 994
14) 983
15) 983
16) 983
17) 975
18] 974
19) 966
20) 959
Hmm…how about 12mm and 80gr? 😆
I say 13.5mm spacer and 75gr. hammer 😛
Well, the spring is what creates all the forces and tension etc. The less pre-load on it the better. Just feels like the heavier hammer is a tad too wild on the power. I think I’ll try it with less spacer and see what happens.
Edit: Wow, 3mm of spacer makes the difference between 900fps and 1050fps.
i think the fifty gram hammer will be easier on the rest of the gun, frame breech etc.
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I work all the time and don’t have time to tinker with the set up as much as you guys, well maybe I do have the time but I elect to have some pints instead.
Plus til I get a house, well I have not a test range as well.
However, the basic synopsis is to keep a .25 pellet below the sound barrier.
Or to keep the pellet from being over pushed.
Lang, Mam, you guys are the best, so much testing done with a ton of info, great shit to the both of ya.
I think, and like I said work evaporates my time, but a lighter hammer with the right spring seems to be the best way to go.
The reason being is, #1 my talon stock with a 18″ tube is getting me a ton of shots around 800 fps, now it’s been a while since I have chronied, maybe 780 fps, but a lot of shots to be had.
OK, so I have a Brad valve, have not installed yet cause J3 never shipped my tank back to me, nother story, see off topic.
Anyway, seems to me a lighter hammer with the right spring would do the trick.
Sounds as if the spring, which I have not installed, is pretty hard on the equipment.
I am gonna put the Brad valve on the tank I just bought here and go from there.
Just thinking the heavy spring would eventually tear shit up in the trigger group and breech.
Lang / Mam keep up the good work.
Love to read your findings
SAW