Hi,I'm new to the air gun and wandering about Type 2 vortex piston. I noticed that my vortex type 2 piston has 160 max bar pressure stamped on it and without a pressure release screw. Is this normal?
Thank you very much for the reply. I raised the pressure to 160 bar before my post, and like your statement, it is violent to shoot. I might do the same spring conversion. I have my chrony coming soon and curious how mine performs with 160 bar fill.
Just to update.I just got my chrony and did quick 3 shots.I got 780.1, 760, and 777 fps using JSB Diabolo Exact King 25.39 gr.
Those are some nice speeds with the JSB 25.39. My 125 Vortex QE 25 cal chrono's at 695 with the same pellet. Factory fill on the piston, I don't know how much that is.
Quote from: MontanaMarine on February 21, 2021, 03:50:56 PMThose are some nice speeds with the JSB 25.39. My 125 Vortex QE 25 cal chrono's at 695 with the same pellet. Factory fill on the piston, I don't know how much that is.NOT certain but I suspect the factory fill on the Mod125 may be 130 bar(?). IMO the measured ~35 fpe at 160bar is pushing the Mod125 right to its upper limit. I'm betting it will wear out parts much faster if kept at that setting. As stated earlier, if the owner LIKES the way that rifle is shooting then he should keep it that way. I can only add that when I tried ~150bar in my Mod95 rifle, it became the harshest springer I've ever shot and it was HARDER to cock than my two-handed Mod135. Accuracy was a terrible 4" at 30'. It didn't really matter to me what the muzzle energy was because I'd almost never hit my target. Backed down to 125 bar in the Vortex and the rifle shot a pleasant "thump" 20 fpe and I could easily drill dimes all day long at 30'.
Quote from: mikeyb on February 21, 2021, 04:49:51 PMQuote from: MontanaMarine on February 21, 2021, 03:50:56 PMThose are some nice speeds with the JSB 25.39. My 125 Vortex QE 25 cal chrono's at 695 with the same pellet. Factory fill on the piston, I don't know how much that is.NOT certain but I suspect the factory fill on the Mod125 may be 130 bar(?). IMO the measured ~35 fpe at 160bar is pushing the Mod125 right to its upper limit. I'm betting it will wear out parts much faster if kept at that setting. As stated earlier, if the owner LIKES the way that rifle is shooting then he should keep it that way. I can only add that when I tried ~150bar in my Mod95 rifle, it became the harshest springer I've ever shot and it was HARDER to cock than my two-handed Mod135. Accuracy was a terrible 4" at 30'. It didn't really matter to me what the muzzle energy was because I'd almost never hit my target. Backed down to 125 bar in the Vortex and the rifle shot a pleasant "thump" 20 fpe and I could easily drill dimes all day long at 30'.Good info, thanks.My 25 is not as accurate as my 22 version. Maybe one of these days I'll try pumping it up a tad and see if it changes. I recently got a hand pump, so just need a Hatsan probe. If I go down that road, I'll probably just try bringing it up to 140 or so, and see how it shoots.
...The next mod I'm working on is somehow reducing metal piston weight and seeing its effects.
Quote from: DCAIR on February 21, 2021, 10:13:47 PM...The next mod I'm working on is somehow reducing metal piston weight and seeing its effects.Suggest you hold off on that until you learn more about how springers work internally, especially these high 30+fpe magnums. They NEED high piston mass to get the compression needed to launch high energy pellets. Cutting mass out of the piston will likely reduce the muzzle energy. I think adding piston mass in the form of a heavy top-hat may improve performance with heavier pellets.If you do decide to chop the piston mass, you may want to order a spare piston from Hatsan. That way when you decide going lighter is the wrong direction you can "reset" back to the factory starting point by simply installing the un-chopped piston.