I've got the Nitro Piston, but it''s in a Crosman Nitro Venom. As I understand the big selling point of the Vortec - you may adjust the pressure. The Nitro Piston is fixed, not adjustable.
Quote from: Roadworthy on October 22, 2014, 10:26:45 PMI've got the Nitro Piston, but it''s in a Crosman Nitro Venom. As I understand the big selling point of the Vortec - you may adjust the pressure. The Nitro Piston is fixed, not adjustable.You can put more air in it but you can't get air out if you want less pressure.
Quote from: PIPERMAN on October 23, 2014, 03:48:12 PMQuote from: Roadworthy on October 22, 2014, 10:26:45 PMI've got the Nitro Piston, but it''s in a Crosman Nitro Venom. As I understand the big selling point of the Vortec - you may adjust the pressure. The Nitro Piston is fixed, not adjustable.You can put more air in it but you can't get air out if you want less pressure.Kostas,I've never played with one of these Vortex gas rams, but you can get the air out if you want. Here's some info from another post:1) Remove the vortex ram from the gun and depressurise it by holding it with the steel shaft pointing vertically downwards. Connect your air line and slowly open the valve on your air cylinder, or start pumping, until the pressure in the air line is slightly greater than the internal pressure in the ram and the valve opens. It will make a small "ping" noise as it opens, exactly like the valve on a Hatsan PCP rifle air cylinder does when you fill it. At this point release the bleed valve and any air left in the vortex ram will escape to the atmosphere through the air line. The vortex ram uses the same fill probe as Hatsan PCPs. 2) Repressurise the vortex ram from your air cylinder, or pump, whilst holding it with the steel shaft pointing vertically upwards. In .22 calibre an 85 Bar fill will give you approx 600 fps, a 150 Bar fill will give you approx 800 fps 3) Rest the base of the vortex ram on a solid surface and give the top of the shaft a few light taps with a hammer to help with seating the valve needle correctly, then release the bleed valve for your air cylinder or pump. 4) If the valve has seated correctly the shaft will stay fully extended when the air line has fully depressurised, if not it will slowly sink back down into the body of the vortex ram. You may have to try this a few times before you get the hang of this technique. 5) Refit the vortex ram into your gun and test thoroughly with several hundred shots. Use a chronograph to ascertain whether velocity remains constant, or drops over time. If the valve needle is damaged and cannot seat 100% correctly the vortex ram will lose pressure slowly over time in the way you have described and you will have to return the gun to the vendor for repair or replacement. One thing is still not clear to me: how long are these Vortex gas rams good for? I had one fail earlier this year after only 800 shots (my Striker 1000x). I read somewhere there are two generations of the Vortex, including an improved model. Is this true?Dennis