Avenger / Leviathan project 60 FPE in .22

[subscriber]

I am surprised how difficult it is to find info on TP alignment when reinstalling the Avenger barrel.  Then again, that suggests that not many people struggle with it, to end up making internet posts on the subject.  That it should be easy when applying general PCP principles would seem to be good news.

When researching a particular question I often find interesting material that is generally related.  Here is a post by Bob Sterne at the Hard Air Magazine about the effect of TP diameter on PCP power:  https://hardairmagazine.com/ham-columns/the-effect-of-port-sizes-on-pcp-airgun-power/   

The above might help ground expectations.   I would read it in conjunction with the fact that the FX Impact M3 is easily reaching 96 FPE in .22 caliber, using 800 mm barrels.  The latter alone, suggests you should be able to reach 60 FPE with your .22 Avenger.  Of course, as always, the devil is in the details.  For instance; including plenum volume, and potential loading probe airflow interference.

[Lathaniel]

As always an incredibly in depth answer, your knowledge must surely be legendary, I will try your suggestion for getting proper alignment, I'm now certain it's out, 2mm in a 5mm hole is a huge restriction, once again thank you.

[subscriber]

There members on this forum that know vastly more than I.  I invited one expert to weigh in on this thread two weeks ago via PM.  He declined because he has no experience with Avengers. 

I also have no experience with the Avenger, but a lack of direct knowledge does not stop me.  That is because I am willing to try and gather available information and knowledge, where it may be found.  I am able navigate that information by applying basic scientific and engineering principles.  Where there are holes in the information, I am willing to speculate.  I don't have a reputation to uphold, so I am not concerned about looking silly if, my speculation turns out to be nonsense.

I don't have the desire or ability to know everything.  But, I am driven to understand as much as possible.  I have learned just enough from the experts to help me develop a useful level of understanding.

[Lathaniel]

Hello subscriber
Spot on, to be honest I also know very little about the avenger, and even less about PCP's in general. But I am willing to learn, and love the challenge of that. I don't have an engineering or scientific background, so I approach a problem from a purely logical point of view, and often this is where I miss opportunities to understand and achieve my aim. That is where forums such as this, and the people here, who have added their thoughts are of immeasurable value. Its partly why I started this thread, I'm certain there are others like me, working in the dark on a rifle that has very little information regarding modding, partly to learn myself and partly to have the information available for the next person.

[subscriber]

The only absolute when working on PCPs is degassing them before taking them apart.  As you have clearly gone beyond that important detail, I would say you are pioneering the 60 FPE level for the .22 Avenger.  Creating reference material; even if you manage "only" 50 something FPE.

It is possible and even likely that you will improve some parts to the point of needing to replace them   .  Many on this forum have had that experience.

Understanding what makes more power and what makes more efficiency might factor in to the trade-offs that are likely in the pursuit of a lot more power.  There are boatloads of reference materials on those topics on this forum.  On the other hand, if you want to clout pests with only a few mag-fulls of shots, perhaps efficiency does not matter that much. 

I mention efficiency, because opening the flow path after the valve helps boosts peak achievable power, but it tends to reduce the shot count; even when you are shooting at moderate power.  This assumes the valve is not a bottleneck.