New Vulcan Tactic .25 slow air leak... About ready to nix airguns

[amoxom]

So after getting my new Tactic and loving how it shoots, I am noticing I am losing about 20 to 30 bar in pressure when left overnight. Not sure how accurate the gauge on the gun is, but it is noticeably down a little after filling it to 250bar last night.

I have seen a video where Ernest puts in an O'ring underneath the bleed screw of the air cylinder to fix it as they don't come standard with one!! I am on the fence about whether I should dismantle it and look at it myself as it is under warranty. It is frustrating that Airguns of this expense, regardless of manufacturer present problems from new. I also have a .25 BSA Scorpion that was a third of the cost of this thing and holds all its air.

Would you undertake doing it yourself, or send it back to Topgun... Or Airtanks for sale now?

 

[Ginuwine1969]

I have the gun and love it. I also have never put more than 220 bar in it. .25 Cal. Ernest and others have said time and time again that anything over that is a waste of air and is inefficient. With that said I don't think that is your issue, I would recommend you attempt to fix the problem if you can "because you love the gun so far", and you should eventually get use to doing small jobs yourself. Ernest has posted several videos on the Vulcan disassemble, re-assemble, and O-ring changes I would recommend starting there. The Tactic and Vulcan are identical with the exception of the action being further back and the stock. I will fill mine up to 250 this evening and see what happens tomorrow and let you know.

 

[Ginuwine1969]

Oh, second once you fill your gun check it 10 - 15 minutes later and see what the pressure it. That should be your air pressure reading, depending on how fast you fill your tank the air temperature will cause it to read higher and change as the air in the tank cools.

 

[amoxom]

Thanks. I always do a very slow fill to 250 bar when I did it so that heat would not factor in. I do this with all my Airguns actually. Although hard to do, I will leave it overnight again to see if it gets any lower by tomorrow. Then I will know for sure. I do have an email into Pigrov Evgeny at Airgun Technology to see what he says. I had been in an email exchange with him about a 20 MOA scope rail... They are not making one :-(

 

[Ginuwine1969]

I contacted him about an issue, and he told me to contact the seller, right or wrong not the kinda response I expected from all the wonderful things I've heard about him.

 

[amoxom]

Yup, same here.. Call my dealer.

 

[nvelkhunter]

PV=nrT
P = pressure
V = volume, container size
n & r = constants, we'll skip the details here
T = Temperature of gas

P1 V = nr T1
P2 V = nr T2

P2 = nr/V T2
nr/V = P2 / T2

P1 = P2 / T2 * T1
P1/P2 = T1/T2

Assign:
T1 = 70F
T2 = 63F
P1 = 250 Bar

Calculate:
P2 = 225 Bar

Temperature of gas drops 10%, pressure in tank drops 10%. Filled in warm house, checked next day in cold garage or house could explain drop. Insure each time pressure is checked that temperature of gun is at equilibrium and at same temperature.

 

[amoxom]

So the gun was filled in the basement where I keep my Airtanks. Temperature there has not varied. It was cool, and no furnace or AC is on to change the temperature significantly any. I filled the gun and checked it in the same place, just 12 hours apart.

 

[TrapdorSpydr]

Ask Joe B. He will be trilled! Sorry for your problem. 

Hey A, check the hunting forum for my post.

 

[jking]

Amox, Sorry to hear your having an issue. Although I haven't looked at my air tube real close I bet it has basically the same "tattle tale" weep holes that a Cricket has. With some heavy soaped water I bet you can find the leak. At least maybe you can determine which end of the air tube it's leaking from. A balloon over the barrel with tell you if its the valve leaking. Oh, and don't forget the gauge area.
Jimmy