So I tried to back off the hammer spring (counter clock wise) and the gun ended up hogging even more air... 20 shots > 100 bars. Tried 2-4 turns CCW. I think the regulator is set too low so the valve is letting too much air. I might turn the reg all the way up to 140 bars and then back off the hammer spring to lower the velocities. Also I need to plug 5/6 valve holes and see results after that.
So I tried to back off the hammer spring (counter clock wise) and the gun ended up hogging even more air... 20 shots > 100 bars. Tried 2-4 turns CCW. I think the regulator is set too low so the valve is letting too much air, that is the number 1 problem here. I'm going to turn the reg all the way up to 140 bars and then back off the hammer spring to lower the velocities. Also I need to plug 5/6 valve holes and see results after that. Also the trigger guard screw had its threads stripped. Anyone know what size it is? M5 x ?
I'm sure there are a lot more scientific ways but here is how I set my reg. Before I installed my reg I turned the hammer tension all the way to zero-CW and filled the gun to 2000 psi and shot a stream to see the average fps. My stream showed it was still higher than I liked so I next tried 1500 psi. This worked so I set my reg to 110 bar. So my performance is between 200 -110 bar. This kept my velocity to where I liked and showed where the reg would fall off.
AT44 hammer screw goes clockwise to reduce force.. You are turning it wrong way.don't dick with more than one setting at a time. Leave the reg and tune for velocity and shot count.
When fitting with a regulator, yes you have to adjust the hammer force also, but what is more key is that you know the gun and how to do it, ccw is increasing the hammer strike which you do not want, and a regulator is made to make shots more constant, those unregulated shot strings most of those shots are not usable.... A regulator will give you a few more shots, but there is no free lunch your shots are going to be base on your air capacity of the air tube. A regulator is to give a gun a great ES that comes into play at long distance shooting, the shorter that you shoot the less the ES is in play. But we all look for the best that a rifle can attain.
I have the 22 long and have had the valve modified. So I'm getting 40 shots at 900 fps with JSB Jumbo 18 gr pellets and 930 fps with AA 16 gr pellets. I'm getting outstanding results at distances over 100 yards.
Leave the regulator pressure as is, and reduce the hammer strike until you see a slight velocity drop.... If you are not happy with the shot count at that point, you can reduce the setpoint and preload further, and get less power but more shots.... If you are happy with the shot count but want more power, you can increase the setpoint and preload, but you will get fewer shots....Bob
Quote from: blackdiesel on July 28, 2015, 01:01:43 PMI have the 22 long and have had the valve modified. So I'm getting 40 shots at 900 fps with JSB Jumbo 18 gr pellets and 930 fps with AA 16 gr pellets. I'm getting outstanding results at distances over 100 yards.That is amazing! How much did you modify the valve?
If you can't reduce the preload enough, cut a couple of coils off the spring to get more adjustment range....Bob