Hipac check valve

[Gerard]

I suppose you could remove the fill nipple, drill for a full probe of common make, and thereby clean up the front end. I think he's using the exposed nipple to make it more universal for filling, but a simple adapter on a pump hose can use a fill probe from one of the big manufacturers like Hatsan or something.

[Gerard]

Oh, and it strikes me that the potential for leaking pressure into the main tube exists with the SafePac, but only at the threaded valve connection. I guess that'd result in a cold main tube and air pushing out wherever it could. Probably not so much a risk as a fright over nothing when it happens, as in exiting via trigger area etc it probably wouldn't have so much force to do harm.

[antithesis]

I suppose you could remove the fill nipple, drill for a full probe of common make, and thereby clean up the front end. I think he's using the exposed nipple to make it more universal for filling, but a simple adapter on a pump hose can use a fill probe from one of the big manufacturers like Hatsan or something.

This should theoretically also be more efficient, keeping a higher average pressure during the shot cycle, that's why I ported mine as well as the valve inlet both to .170, it's bigger than my transfer port so hypothetically it should show an increase in the efficiency, allowing air in as fast as it goes out

[Gerard]

Not following on the efficiency thing. Besides my typo - full when I meant fill - I'm talking about the front end fill nipple, the foster thing. That's just for filling, not involved during shooting.

[antithesis]

Not following on the efficiency thing. Besides my typo - full when I meant fill - I'm talking about the front end fill nipple, the foster thing. That's just for filling, not involved during shooting.

Oh I know, I'm just stating what should be an advantage over the hipac, it should be more efficient due to the fact there is no restrictions between the valve body and air supply, like a tube filled pcp

[Gerard]

Oh of course. My bad for misunderstanding. Indeed the air flow as the shot is released should be well supported. I'd want to stick a regulator in there though, with at least 20cc of plenum volume. Better efficiency is possible that way, and adding in a well tuned SSG you can achieve very nice numbers.

[Ribbonstone]

Like other co2 designs, could drill a large hole in the Crosman tube...HiPac or SelfPac wouldn't care,  but would cure the possibility of pressurizing the co2 tube.


OK...good job on the gauge install.



Never had the urge to change the fill nipple system,guess you could. The base of the existing nipple system may be thick enough to be tapped (didn't measure it...but am thinking it is) after cutting off the stem.

Selfpac would be much better at making power (so far as I can see without holding one in my hands),and power seems to be one of the main goals for folks thinking of modding  a co2 to air.

[PBguns]

Alex is getting back into slow production (still recovering from stroke).
Will start back with the 2240s.

[antithesis]

Alex is getting back into slow production (still recovering from stroke).
Will start back with the 2240s.

Wow I guess he's doing a little better....I ain't been over at the hipac group in awhile I didn't think it'd happen honestly

[Buldawg76]

Congrats on all of you who got hipacs that actually were able to get them to seal up. I bought two 2240 units with 2 extensions each and never could bet them to seal even after some maching of the surface for the o rings in the extensions and trying sealing compounds. After months of trying I finally just gave up and took my losses.

I contacted Alex and was informed that his product had no issues and it must have been all my fault. I am sorry to hear he had a stoke but he will never get my money again.

BD

[Gerard]

Yeah, that matches with the attitude Alex offered me when I commented on the leaks. He alleged that nobody else had problems, and that if I REALLY had a defective unit I should have returned it. I wasn't asking for a refund nor a replacement, I was sharing my experience in  hopes it may benefit others in troubleshooting their leaky HiPACs. He continued in attack mode via email then in his private forum. The man has issues.

[PBguns]

His new site is up today....nothing stocked onsite yet. But it's a start. : https://hpa-hipac.com/
Guessing it will be updated in the coming days/weeks.
I had leaks when I got mine as others have also.
I emailed and got a not so friendly response.
Wasnt over the top, but wasn't what I expected after I paid for an item from him.
We got over that in the correspondence....and I resolved my leaks trying other orings.
Yes, he is not the most friendly. But some people just aren't. If you have a use for the product....well there isn't a whole lot of other choices out there (unless disco tube or a drop/reg bottle setup etc).

[Buldawg76]

Here are some pics of the issues I had after I had a couple aluminum tubed setups made by a friend at 16 and 14" in length. The steel 2240 insert end broke at the thread root where it screws into either the fill tube or an extension. He initially made just the tubes and used a disco fill assembly but when he assembled the units and checked runout in the lathe with a live center and chuck there was some runout so he tried to apply some light pressure to reduce runout of aluminum tube portion. So he made me two new aluminum 2240 inserts as well. The thickness of the metal where it broke was .050" thick so not safe at all IMO.

I would strongly suggest that a barrel band be used on every extension or fill tube to prevent a flying projectile in the event of a failure. 3000 psi fills are just asking for a disaster to occur IMO.

[PBguns]

I have never filled mine past 1500......I'm a little nervous about it even then.
I have plenty of pcps for normal 3K fills.
That carbine has limited days....think it's going to built into a 1740 with some nice grips soon (and trade-off the hipac). 

[Ribbonstone]

Slithering out from under my HiPac rock.....

Pleased Alex is doing better and is on his way to getting back on his feet.

Some things just don't have your name written on it,even if others like them.  I had that run with R-7 (springers), never getting a "keeper" in 3 trys....would have been ahead to just recognize that it wasn't my fate after the 2nd try.

Yeah...he was a bit opinionated....probably still is.  So am I. 

LIKELY why I'm not his favorite person:

1. Did call him on it in posts.  Did ship out some "turds",most of which were 2nd-person turds.
 
Firmly believe it was  just him and a "tame"machinest,and he chnged machinest at some point (the "$)((# point"). Hopefully changed yet again.

2.(Not my fault)just when he was starting up the QB conversion tube, "they"changed the QB end caps...which created a "ship load"of confusion.

3.(Also not my fault): the "hole though the leg"video from a miss-used/ unauthorized application of a HiPAc.

 Am thinking your problem was either fate (like my R7 experiences) or #1 above. Problem being, Alex would likely not  be real receptive to that at some points....likely more receptive to that "$)((#" idea later(like me, we may be hardheaded,but if you beat on us long enough, we learn).


I did learn he did test the prototype units a sealed vessels.  As sold, they are NOT sealed vessels, and the rules / regulations of  sealed vessels don't apply.   

Actually looks simpler to do that it is,and I did have a real fight getting the first one (.177/2240) to actually act like a PCP.


So don't take offence,,,just going to do a run down on the HiPAc uunits.
Doen't help that I had less trouble...just random selection.


1. Within the limits of marketing (selling them)  he could have made the process seem simpler than it really is.

2. Better to think of it as a total restart....forget what you know about the co2 function,  reboot.   It's a "shop load"easier to tune an existing PCP than convert a co2 to PCP.

3. HPA (bottle) conversions are actually easier; regulated they don't run at that much higher pressure.

4. No such thing as "too strong" valve fixation.  Whiloe that was adresseed,the importance of that maybe  wasn't stressed as much as I would have liked more likely it gets ignored as the info at the time was pretty clear).  (Basically it's an open ended, insert, PCP tube with a compression seal to the valve body

5.At the end(well...as he'sback in the game,lets call it the "break")..were shipped with one striker spring,and that one was the  super strong spring.Likely acknoledgement that most of the buyer were looking for big-time energy increase,but it was the hardest to get working right spring.

6. Getting the right spring tension to run well on air within the short spring-space of 22XX guns is not as easy a balance as you'd first think.  Shorter the spring, the more differnce small changes make.

7.  Under-reported,but it make a great co2 bulk fill system...in that role,it was close to "plug and play".

Do wish Alex luck with this re-entry.... also hopes he up-dates/revises both the units and the insructions.

FOUND an old photo-file.

  2 Pistols (2250 and a .177/2240):



Of the two,the 2250 got used up in other projects (the ""Crosman Lego Effect") as I actually bought PCP's. The little .177/2240 still in use.

5 long guns:


LEft to right: First 2  fell victom to the Crosman Lego Effect".  Only the 3rd and 4th are still being used by me as HiPAcs.  "Beater" #4 was a prize for a really good guess to a question here on the boards and might be running  on co2 or on the HiPAc tube...up to the new owner.

So even as a fan.....most of them didn't stay HipAc.  Some got convberted to partsw.some to PCP tubes,and some back to 12gr. co2.
-------------------

The suspision,now that repeater PCP's are inexpnwsive, is that the maket has changed....will see if his offerings changed along with it.

Other useful stuff from Alex:

A near doubling of the valve volume in a 12gr. co2 valve. Were some problems with the orginal valve stem seal...but as a hi-pac (or12gr. co2) gas flow limits the actual shot to the volume inside the valve,doubling the volume certainlky made making more power easy.




An adapatable LDC. Threaded all the way though with threaded baffles, made chamber size variable...and a "clean"looking unit on Crosmans. 






Still use this basic/home brew version of a spring travel limiter/ anti bounce device on the 2260,even though there are nicer ones on the market:




Anyway....I'll slither back under my rock now.

[Buldawg76]

All's good and I believe I just got a bad run of inferior machined parts but overall design of o ring sealing surfaces were not well thought out as compared to any other joint sealed by o rings in that there has to be two flat surfaces in contact with opposites side of an o ring whether on a vertical or horizontal plane to affect a proper seal. The parts I received did not have any two opposite surfaces with a flat surface to capture the o rings and create a good seal. The threads of each part went all the way to the end of tubes so when threading together the o rings would be squeezed up and out between the two parts. No amount of sealer or different o ring sizes was going to fix that Issue.

Been fixing fluid vessels for enough years to know the design had no merit or chance of ever sealing short of welding together which was actually tried but the metal was not of sufficient quality to even weld adequately. 

So I will say again use at your own risk as my opinion is unsafe at any pressure.

BD

[antithesis]

RS,

I actually still have that picture saved somewhere....it's good as a centerfold to me and my crosman erector set addiction 😆