Air Venturi Avenger .25 ?

[ADK_Airgunner]

Hi all

I’m new to the PCP game n purchased the Avenger in 25 cal. Past 2 times shooting it, I’m getting about 18 shots then the next few shoots are about 6” low 

I start off with a full 300 bar fill, reg is set to 2100 psi and the hammer spring is all the way out plus half turn in. I’m shooting jsb Diablo 25.4. It was 35 degrees out, not sure if that plays into it. 
any help or tips would be great. 
thanks all

 

[Odoyle]

What chrony numbers are you getting?

Try starting at a lower fill like 3000psi 207bar see if it still does it.

 

[crosman2016]

I wouldn't think that 35 degrees would be too much of a burden on velocity...the colder air is more dense than warmer air, but if it was like 15 or 20 degrees, I could see issues there. I'm sure someone will be along with a more technical answer to your question.

 

[ADK_Airgunner]

Thx guys, with my FX pocket chrono, I’m getting like 870 avg 

 

[UncleHoot]

Your hammer spring is all the way out and 1/2 in???

My hammer spring was all the IN and 1 1/2 out!

Somethings not right here. I believe your hammer spring might not be hitting the valve hard enough. Try turning the hammer spring in a couple of turns and observe results.



Hoot

 

[ADK_Airgunner]

Thx buddy. I will try this. 


sorry for confusion. I turned the HS all the out and then turned it in a half turn. Ok, I will turn it in more. 

 

[OTmachine]

My .25 Avenger. 25 gr JSB Kings

Readjusted Reg to 2100. 3400 psi fill, 881 fps with 2 1/4 turns in on the hammer spring - 32 shots ending at 2200 on the gauge

 

[ADK_Airgunner]

Thx for the info! One question, Why are you only filling to 3400psi and not a full fill? 

 

[OTmachine]

I have 4 mags and a hand pump. Takes 70 strokes of the pump to refill. Works for me.

 

[ADK_Airgunner]

What chrony numbers are you getting?

Try starting at a lower fill like 3000psi 207bar see if it still does it.

How does the lower fill pressure help? Sorry, I'm new to the PCP world



Thanks in advance

 

[ADK_Airgunner]

I put my HS 2-1/4 turns in and I got about 28 shots, reg was set to 2100 and dropped to 1900 psi after 28. 

How does lowering the fill pressure help?

 

[OTmachine]

For me, if something says it can do 1000 maximum, it would seem to increase the life if I don’t take it to the limit all of the time, so I will go to a lower workable value of say 750 to 800. From what I read and have experienced an 875 to 900 fps velocity for a 25 gr pellet is the place to be. I have filled mine to 300 bar several times, but decided there wasn’t a lot of advantage to it. A lower fill pressure should increase the regulator life, (at least in my mind). And a lower regulator pressure should increase the life of the poppet. It is possible on yours, that the power adjuster screw’s snap ring is hanging up. You may not be getting the same amount of turns as I am and therefore using more air.

 

[Removed]

Where's Steve on this one? He's the tuning master of these I think right? 

 

[ADK_Airgunner]

Steve is the master on it for sure. His video is great! Steve help!!!!! Lolol 

 

[LostinTejas]

Thanks folks. I just went and set mine to 2400 on the regulator. Set my spring 2 1/4 in. We'll see how it works. I shot my chronograph last year working on a Grendel load. Wife said I just wanted a new one. Not really, I had become fond of that old Chrony. Had it for just under 30 years and it was sill going. Dated, but still within 5 fps of everything I ever tried it against. 

 

[M0ist0ne]

My avenger in .25 shoots consistently from full fill down to 2300psi. Reg is set at 2300psi and hammer is 1 1/2 turns out from full in. Tuned for hades/25.4 pellets.

 

[ADK_Airgunner]

How many shots are you getting? What fill pressure? Thx for the info

 

[Samswit]

Tuned mine like this and it helped! Thanks for the tip