Regards, is there any way to increase the power on the Benjamin Fortitude .22 ? Mine is shooting Jsb 18 grains at 740 fps !
I would like to increase 100 fps.
Thank you.
Tuning Benjamin Fortitude .22
- Thread starter El_Teacher
- Start date
Regards, is there any way to increase the power on the Benjamin Fortitude .22 ? Mine is shooting Jsb 18 grains at 740 fps !
I would like to increase 100 fps.
Thank you.
Adjusting in the hammer spring doesn’t make a big difference on the fortitude. The only thing I can think of is to take out the regulator and adjust it. That gun gives you a good shot count but is a little low on power.Mine barely makes 20 FPE.
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As mentioned adjusting the regulator will help. Once adjusted you will need to adjust the hammer spring or replace it with a heavier one. Likely a slightly larger transfer port, with the valve and barrel ports matched to it, will increase FPE as well.
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The plenum on the Fortitude is just the space in the valve and it is a short one at that. The typical methods mentioned above will not obtain 100 more FPS. It needs a bigger plenum, but is not that easy to do. I converted one to 25 cal/40fpe. The key was making a “bridge” to span the vent and the trigger assy screw hole.
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It's not designed to put out more power, just shoot it as it is because it's really tuned from factory to be at it's sweet spot. If you want more power then get a different gun or run lighter ammo to get the speed you want.
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So idk if this matters but I’ve been putting back together an old fortitude I’ve had in parts for five years and am doing a 1300kt lower and folding ar stock project on it but I played with the internals extensively, if you open the reg all the way and mod a marauder transfer port to fit by taking some material off the top so it presses firm against the top gasket but the action sits flush for a good seal, you’ll get around 900-930fps but you drop it off the reg after around 2500 psi and ur over gassing the system, ur best bet for more power and shot count is to not touch the reg but to play with the dwell time which is the amount of time the valve is open, what I did was put a weaker valve spring in the valve for it to open easier and longer aswell as cut around 3-4 coils off of the hammer spring which also eased the cocking and made it really smooth with little to no preload on the spring with some wiggle space between the power adjustment cap and hammer. I turned the hammer spring adjustment screw in 3 turns and ran a shot string through the Chrony. I was getting over 30 shots with 15.1 grain pellets at 835 fps with extreme spread of 10 and standard deviation of around 5 at sub 25 ftlbs of energy which is pretty solid given the limitations with air volume and plenum size for this platform.
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These valves aren't cheap, are listed for the Marauder pistol, but there is a second set of screw holes for the Fortitude tube. More power than the stock valve at any given pressure, less hammer spring tension required. I have three, used in two P-Rod builds and in a 1720 bottle build.
RA-ARA-0402-2024 P-Rod SS Balanced Valve
www.jsairrifles.com
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