I got the power bug really bad and it all started out with a stock Prod and have gone from 14-16fpe to 20 fpe to 26fpe to 32 fpe to 36 fpe and now to 40 fpe for 5 shots , I have hit 47 fpe for 5 shot and not able to recreate the same shot string again. As of now my modified Prod valve can shot 22 cal 25.39 JSB monsters at 850fps at 40 fpe and I have hit up to 910fps for 47fpe for 5 shots. Mods to the Valve include opening up the valve cap to .390 dia, valve throat .260 dia and barrel/transfer port/ angled exhaust port to .180 dia. and hammer spring to 0.3 x 1.5 with a 0.45 dia with 4.5 turns CW on the hammer spring and 0 turns on the hammer striker.
I have some more ideas for improving the Prod valve performance but I need some help from a machinist to make more mods to the valve and clean it up my basic hand tool mods to the valve... I will be meeting another forum member at the Pacific Airgun shot this weekend, I'm really stoked to get my Prod project going to the next level.
I have included a sucky video for you to see the what is possible with a Prod.
Shooting JSB Monster 25.39 gr pellets 5 shot strings start at 3200 PSI 850 fps 873 fps 864 fps 856 fps 846 fps ending at 2400 PSI Ave fps 857 ave and 41.4 fpe
5 shot string of ave 910 fps at 47fpe
Video shot string 7 shot strings start at 3200 PSI 846 fps Err 861 fps 843 fps 842 fps Err 795 fps ending at 2000 PSI I should have stopped at 5 shots for the ending PSI!
I did the video so cabooses212 could see it could reach higher fps/fpe without having to make custom 25 cal pistol. I didn't want to come out with my modded Prod until it was constantly shooting at 850fpe range and I had it on video as well. It didn't happen unless you can see photos or a video..
by screwwork » Wed Mar 04, 2015 10:06 pm 
