Anyone with a Hatsan 95 Vortex in .22 at altitude

[CO_Steve]

Nevermind, I got it. That's all the preload mine had. Came right out.

[Gut2Fish]

Yup, just the 3 pins along end of piston chamber. If it moved out that's it. Mine was a nitro conversion of springer so would make for distance difference. Maybe mine only popped out an inch, been awhile. Still will take a screw clamp to compress. I'm amazed how much it takes to move those heavy duty pistons. Put the ram head down on floor and was pushing on it with body and wouldn't budge.

I adjusted the trigger while it was out. Found that before putting back the sliding safety that attached to cocking arm you can adjust it in place. The slot behind where the safety slide goes you can use small screwdriver to recock the trigger there. Then of course your adjusting (replacing) screw and watching contact of trigger plate sear and middle sear in round hole up and to right of that slot. Screw driver to push back middle sear and trigger is in fire position again.

[CO_Steve]

I tried the same thing. Leaned on it on the floor. Not a chance.  Is there an easy way to play with pressure on these things? I know what the levels are but I do have a Benji pump from a Disco.

Seal looked good but was very loose in the bore. The weight of the piston was enough to cause it to fall to the bottom. I ordered a JM seal for it. I understand there's some fitting involved, that will be new to me. The cylinder is tighter above the compression area so I'm planning on honing that out to make fitting easier. Lots of moly everywhere, it was well lubed.

I had already done the trigger from the youtube video series.

[Gut2Fish]

I don't know who JM is for that seal. For the sake of less in shipping believe it or not ordered my seal from Custom Seals in Australia instead of Pyramyd Air. Took three weeks to arrive but that and breach seal cost about $6 less. Didn't have to fit seal; was perfect size, snug but not too cramed in fit that in first few shots made an almost sucking sound when cocking. Perfect. As for the stock seal. Yeah that was crud, very lose fit and onl had maybe 1500 rounds on it, fps had gone down drastically.

It's been said on the Vortex that it can be adjusted, no idea how. Was thinking that extra screw on cylinder housing that goes into the ram is somehow the port but again no idea.

What I was saying about the trigger was if you wanted to add a longer screw to barrel side of trigger it's nice to do it and grind to size when stock and safety slide is off. By using a screw driver in long slot low on trigger housing you can move middle sear to recock trigger then screw down longer screw while watching sear contact so you don't leave a screw that's too long in. Grind end rounded to length that still provides a safe contact. A short snappy second stage.

Photo shows where to reengage trigger and up and right of there is a large hole that you can view your upper and middle sear contact after cocking trigger. With a longer trigger adjustment screw, one barrel side of trigger, you lessen that contact of sear distance. Looking at trigger you see it rocks on that screw on trigger plate so you grind the end round for smooth first stage motion.

[CO_Steve]

JM= James Maccari

http://www.airrifleheadquarters.com/page/page/251327.htm

[CO_Steve]

So I found some references to changing pressure in the vortex. You need some sort of adapter that is said to be available from Hatsan. I cannot find it on the parts page. It looks simple enough. The disco pump should do it. Not going there just yet.

[CO_Steve]

So today I finished putting the new JM seal in my Vortex 95. The seal was as advertised larger than the factory seal. Fit was snug but not excessively tight (I had honed the tube a bit). I could move the piston with a little effort. I decided not to do any fitting at this point and just put it back together.  First impression. The firing cycle has totally changed. Remember I'm at 6000 feet. This is my first gas ram gun. To me it felt a bit like a springer. There was a strong thunk/bounce to the stroke. Now it just goes thunk. Vibration is reduced by 50% at least. Early chrony numbers showed not much improvement, high 600s. No smoking/dieseling, I went pretty light on lube. It's starting to group now even with CPs. I shot some nickel sized groups off a rest from 15yds. It would never do that before. More pellets needed to get conclusive results. I've got some HN FTT on the way.

[SteveP-52]

For the gas ram, it takes a Hatsan fill probe and a hand pump. If I remember right, the rams in the 95's are filled to 125 bar. Can only guess if you can go higher as I don't know of anyone who's actually done it. Would also guess you'll get more power but with more power comes harder cocking and harder recoil....probably like the guys who have the 125 sniper and 135 Vortex describe.
If you decide to try, definitely post on how it turned out.

[CO_Steve]

Is that the same as the PCP probe on the parts page? The ram says 150 bar max, max velocity at 125.

I just sold my disco package with pump so it might be a while before I try this.

[blackfocal]

yes the hand pump probe is the same for the PCP probe. Hatsan vortex pistons come at the prime pressure to get the best performance out of them. If you go higher you loose the performance.