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 Post subject: 2540 vs 2560
PostPosted: Wed Jun 26, 2013 11:59 pm 
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Joined: Fri Jul 06, 2012 12:58 am
Posts: 147
Location: Kebekistan
I might start a project rifle around the 22xx platform :D

i recently got a very nice .25 barrel from Gippeto :supz: and wanted to attach it to a 2260 tube ( witch i dont have now but can get easy )

a made some testing with a 2240 tube and a highly modded valve and a very strong hammer spring

results were not impressing me :cry: but this thing hit quite hard :shock:

470 / 480 fps and about 22 usable shot per 12gr co2 using H&N baracuda hunter extreme 28.4g :mrgreen:

- does the 2260 use the same valve than the 2240

- is there any other way to get more power than using a hipac ( next logical step i think ) and how much more ?

my other option was to buy a discovery and simply put the barrel on ( but i like the 22xx , so many things can be done to it )


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 Post subject: Re: 2540 vs 2560
PostPosted: Thu Jun 27, 2013 12:03 am 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8979
Location: Coalmont BC
2240/50/60 all use the same valve....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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 Post subject: Re: 2540 vs 2560
PostPosted: Thu Jun 27, 2013 12:05 am 
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Joined: Fri Jul 06, 2012 12:58 am
Posts: 147
Location: Kebekistan
so if i want more power i need more pressure ( hipac )

and more volume

does a disco valve fit in the tube ?


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 Post subject: Re: 2540 vs 2560
PostPosted: Thu Jun 27, 2013 12:09 am 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8979
Location: Coalmont BC
Yes, the Disco valve fits, but you need to anchor it with 3 screws if you are going to pressurize the tube.... A HiPac doesn't pressurize the tube, only the valve.... If you are going for more than 500 fps, you need a PAL and a 2260 tube as that makes it a rifle.... Using a 2240 or 2250 tube it remains a pistol, regardless of barrel length or adding a stock.... (RPAL required)....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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 Post subject: Re: 2540 vs 2560
PostPosted: Thu Jun 27, 2013 12:14 am 
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Joined: Fri Jul 06, 2012 12:58 am
Posts: 147
Location: Kebekistan
the 2260 tube was the reason ( Pal )

I tough about the hipac because it's an easy way to switch to hpa but if i can pressurize the tube with a disco valve i could use a remote reservoir and place it in the stock ?


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 Post subject: Re: 2540 vs 2560
PostPosted: Thu Jun 27, 2013 12:20 am 
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Joined: Fri Jul 06, 2012 12:58 am
Posts: 147
Location: Kebekistan
what kind of results could i expect with a disco valve ??? 600 - 700 fps ?


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 Post subject: Re: 2540 vs 2560
PostPosted: Thu Jun 27, 2013 12:38 am 
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Joined: Sat Nov 03, 2007 4:19 pm
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Location: Coalmont BC
Disco valve and 24" barrel, no reason it shouldn't perform like a Disco.... 22 FPE in .22 cal is typical.... (eg. ~800 fps with 15.9 gr.)

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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 Post subject: Re: 2540 vs 2560
PostPosted: Thu Jun 27, 2013 12:56 am 
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Joined: Fri Jul 06, 2012 12:58 am
Posts: 147
Location: Kebekistan
rsterne wrote:
Disco valve and 24" barrel, no reason it shouldn't perform like a Disco.... 22 FPE in .22 cal is typical.... (eg. ~800 fps with 15.9 gr.)

Bob


Doh .... i should have find out that my self :roll: :roll: :roll:

with a 28.4gr in .25 i should get 590-600 fps ....... :(

and with a 26gr around 615 fps :?


would it be possible to push it to 700 fps and 30FPE without breaking the bank ?


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 Post subject: Re: 2540 vs 2560
PostPosted: Thu Jun 27, 2013 8:26 am 
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Joined: Tue Jun 03, 2008 5:46 pm
Posts: 2815
Location: Canada
700fps? Without any trouble once running on air. You're limited by fill pressure, but I know even Bob has managed 46fpe in .25cal running @ a regulated 1800psi. Many folks running disco's at 2400psi with beefed up valve screws.

topic51268.html?hilit=2560

Regards,

Al


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 Post subject: Re: 2540 vs 2560
PostPosted: Thu Jun 27, 2013 12:42 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8979
Location: Coalmont BC
A stock Disco converted to .25 cal runs in the 30 FPE range because the larger bore gives more "push" to the pellet.... but it uses more air to fill the bigger bore, of course.... My 2560 PCP running 1800 psi regulated shoots at 52 FPE with 25.4 gr. JSB Kings, and very efficiently.... More FPE can be had with heavier pellets and more air used....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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 Post subject: Re: 2540 vs 2560
PostPosted: Thu Jun 27, 2013 8:34 pm 
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Joined: Fri Jul 06, 2012 12:58 am
Posts: 147
Location: Kebekistan
good , now i have to decide betwen 2560 and Discovery ..... both are gonna cost about the same to build but the disco should be less trouble ( already a pcp )

Thank's


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 Post subject: Re: 2540 vs 2560
PostPosted: Fri Jun 28, 2013 1:00 am 
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Joined: Fri Nov 10, 2006 12:02 am
Posts: 1076
I have one of Als .25 cal barrels with a Hipac in a 2260 tube and a stock 2240 valve except for a custom made valve stem. At 2250 psi with .25 cal JSB 's the gun will shoot from 400 fps to 700 fps depending where the RVA is set. If I make a valve 3/4'' longer and port and polish it I am sure there is still more power but I like it just fine as is. I brained a sqirrel with it at around 575 fps at about 15 yds and it flew off the limb like it was hit by George Foreman.



George.


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 Post subject: Re: 2540 vs 2560
PostPosted: Fri Jun 28, 2013 1:09 am 
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Joined: Sun Jul 15, 2012 10:49 am
Posts: 6029
Location: Victoria, BC and Clarkston, WA
Sounds like what I plan to build George! Glad you are still on the Forum!

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-Rick
Pardini K10
Brocock Concept .22
3 Custom Crosman 2260
Benjamin Discovery .22 w/Joe Hickey stock!
Crosman 150 pistol .22
4 Crosman MK 1 pistol .22
Mrodair CP-1M .22 and .177


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 Post subject: Re: 2540 vs 2560
PostPosted: Fri Jun 28, 2013 1:37 am 
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Joined: Tue Jun 03, 2008 5:46 pm
Posts: 2815
Location: Canada
Converting to the two stage 1701P trigger requires a striker without a waist....ie...heavier. Win/win kinda thing. :wink:

Al


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