Vulcan .25

Forums PCP Airguns Vulcan .25

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    Mughal
    Participant
    Member

    Hi everyone
    I bought vulcan .25 few weeks ago 
    Was facing a problem my regulator was not locking … while hunting i always have to waste my 1st pellet to get real velocity even if i fire my gun after few mins
    Because if i left my gun for a while my 1st shot was always on high velocity about 40fps but after 1st shot every continues shot was consistent and extremely accurate 
    Then i sent msg to company Pigrov Evgeny about this fault they did sent me a regulator dealing me as a customer was fine 
    i installed the regulator and everthing became perfect expect the shot count … i heard 40-45 shots almost everyone getting on 880fps with 25grains jsb 
    But i am getting about 36 consistent shots on EH883fps and eL 874fps from 250-150bars
    can anyone guide me is this normal if not then what went wrong ….. ?
    Regards 

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    Deja
    Spectator
    Spectator

    Sounds a lot to me doubt i get 4 mags with mine. not sure need to check next time i fill, too bad my scuba is at 240 bars now.

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    KYAirgunner
    Participant
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    Mines getting about 30 or 36 shots on the reg.

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    fe7565
    Participant
    Member

    What happens to the fps when you come off the regulator?  

    Are you sure your gauge is correct? My first gauge would never go above 210bar, yours maybe off but the opposite way and showing 250 bar while possibly filled lower.

    Do you feel any puff of air on your cheek when you shoot?  Some place a thin tissue over the pellet loading port to see if the pellet probe seals right.

    If the problem is a leaking o-ring somewhere, on the TAG forum there is a specific section for Vulcans with some hardcore tinkerers who may have more insight. 

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    Mughal
    Participant
    Member

    Yes there is lil air blast on every shot in the cheek and eye its annoying ….seems like this shot count is normal 
    Thankx everyone

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    Deja
    Spectator
    Spectator

    I dont know about you guys but mine group better at 820 fps or 250ms with 33.9gr mk2 heavies. Just me?

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    hsnmz
    Participant
    Member

    MughalYes there is lil air blast on every shot in the cheek and eye its annoying ….seems like this shot count is normal 
    Thankx everyone

    There shouldn’t be any air puff. It seems the screw for barrel alignment isn’t tight enough. Also it seems that the your regulator is set to a higher pressure.

    I have adjusted my Vulcan regulator with the tester to 130 bars and adjusted the valve also. The regulator is very sesitive to the adjustments, took me a while to get it where I wanted it. Tested the gun last night. Shot 2 mags got 3 errors due to low light. here is the result:

    240 bars
    907
    907
    906
    907
    905
    907
    906
    911
    912
    904
    909
    909
    908
    905
    903
    200 bars

    It consumed 40 bars for 18 shots.

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    fe7565
    Participant
    Member

    There is one screw right next to the loading port on the top section of the action. On the .25 it serves no purpose, however there is pressure behind it when you fire the pellet. Make sure that the screw is seated properly. I heard someone used thread lock.

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    Mughal
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    hsnmz

    MughalYes there is lil air blast on every shot in the cheek and eye its annoying ….seems like this shot count is normal 
    Thankx everyone

    There shouldn’t be any air puff. It seems the screw for barrel alignment isn’t tight enough. Also it seems that the your regulator is set to a higher pressure.

    I have adjusted my Vulcan regulator with the tester to 130 bars and adjusted the valve also. The regulator is very sesitive to the adjustments, took me a while to get it where I wanted it. Tested the gun last night. Shot 2 mags got 3 errors due to low light. here is the result:

    240 bars
    907
    907
    906
    907
    905
    907
    906
    911
    912
    904
    909
    909
    908
    905
    903
    200 bars

    It consumed 40 bars for 18 shots.


    what adjustment in the valve u did … will u plz guide a lil
    thankx

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    Mughal
    Participant
    Member

    fe7565There is one screw right next to the loading port on the top section of the action. On the .25 it serves no purpose, however there is pressure behind it when you fire the pellet. Make sure that the screw is seated properly. I heard someone used thread lock.


    true i just checked there is too much pressure cming from there but i c nthing there to seal that air i mean no oring or anything like that which can seal air … screw is too small am too afraid to tighten it beyond its limit i might slip the screw i dont wanna destroy it ….. zzzzz

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    Mughal
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    Member

    ok sealed it now … i did just cut a oring of same size as the screw is put lil part of oring inside and tighten the screw and there i go … no more leakage … i am sure velocity would have increased now …. will check it tomorrow as no more light here 11:30 pm so chrono wont work …..

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    fe7565
    Participant
    Member

    If the source of leak is that screw then it could affect the accuracy and shot count.  That screw supposed to seal by itself without any o-rings, but some others used (semi-permanent?) thread lock compound. 

    May also want to check Ernest’s videos http://sniperlabyo-precision-airguns.com/  where he shows how to put the Vulcan back together (he had a .22).  There may be something not exactly right after you replaced the regulator.  For example when sliding in the barrel there are some delicate fitting maneuvers for the barrel and tank clamps, etc that has to be done just right. 

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    hsnmz
    Participant
    Member

    Mughal[quote=hsnmz]
    what adjustment in the valve u did … will u plz guide a lil
    thankx

    Loosened the valve by 3/4th of a turn

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    Mughal
    Participant
    Member

    fe7565If the source of leak is that screw then it could affect the accuracy and shot count.  That screw supposed to seal by itself without any o-rings, but some others used (semi-permanent?) thread lock compound. 

    May also want to check Ernest’s videos http://sniperlabyo-precision-airguns.com/  where he shows how to put the Vulcan back together (he had a .22).  There may be something not exactly right after you replaced the regulator.  For example when sliding in the barrel there are some delicate fitting maneuvers for the barrel and tank clamps, etc that has to be done just right. 


    that screw is just for barrel alignment … i dont think putting lil rubber in the screw will effect accuracy …. i saw barrel it is aligned properly ….
    and it was leaking air like this only even before installing regulator..
    u made me worried now that time i thought orings r new mb air cming from bolt ….. r u sure it wil effect the accuracy ?

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    fe7565
    Participant
    Member

    The transfer port is below that screw and if I remember correctly someone mentioned that the air can get around the barrel and the o-rings sealing the pellet probe. So when you fire and as the pellet moves forward it can affect the pressure behind the pellet until it leaves the barrel. On the .22 Vulcan that screw actually holds/aligns the barrel, but on the .25 it does not.

    If it’s not the screw where the puff of air comes from then it could be the o-ring(s) around the pellet probe inside the barrel.  I do not know how that is setup inside, Ernest’s video may explain.  

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    Mughal
    Participant
    Member

    checked today the lil part of oring did great job to seal air and played with regulator a lil and did set my regulator between 135-140bars .. now gun is giving about 44 shots @ 900 regulator breaks down between 130 and 140 bars very happy now …
    thankx everyone

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    hsnmz
    Participant
    Member

    “Mughal”checked today the lil part of oring did great job to seal air and played with regulator a lil and did set my regulator between 135-140bars .. now gun is giving about 44 shots @ 900 regulator breaks down between 130 and 140 bars very happy now …
    thankx everyone

    
Glad to know that

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    fe7565
    Participant
    Member

    Great…sounds like it’s working as it should!  

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    Mughal
    Participant
    Member

    yah …. accuracy is as good as it should b …. :)

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    marius1691
    Participant
    Member

    did you change valve tension to, or just regulator?
    Thanks

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