Air valve question for Crosman 2240

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thomashood3

thomashood3

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Apr 28, 2022
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Kentucky, United States
New air valves needing break in period???

First time switching out a Crosman stock 2240 valve for more capacity (boss valve). Put it in last night. Good installation, & checked valve o-ring seated correctly between tank and breech, shot about 30 rounds to test. If anything, the gun felt a bit slower in FPS. No Chrony, but shooting 15 yards and going by ear, sounded a bit slower with target contact. Wasn't leaking air as far as I could tell. Finished up, took out the spent Co2 canister and noticed the tip wasn't punctured nearly as deep as the old valve punctured Co2 canisters. Can't even get a bulletin board pin in the hole. Wondering if the valve has to break in because of new return spring? Wouldn't think so, but I need an experienced tinker's viewpoint.
 
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So long as the cartridge has a hole visible to the naked eye, it is adequate to recharge the valve after each shot. Meaning in the time it takes to load another pellet and fire.

Regarding a possible change in velocity, a new valve has the potential to change several things. Not just the valve spring itself but also its preload, the stem’s projection and therefore the hammer travel, the poppet’s sealing diameter and therefore the force required to knock it off the valve seat, and so on. None of these things are subject to any meaningful amount of break-in.

Really need to run it over a chronograph to see the result. The sound of pellets hitting the target may be a clue if your ears are well trained through repetition, but at the same time the muzzle blast may produce a misleading sound signature, making it hard to judge. For example the 2240 has way too much hammer strike in OEM form so it has a needlessly loud report. If the new valve uses a heavier valve spring or some other measure to improve CO2 consumption, it could have a very different sound at the same velocity or even at a higher velocity.

Bottom line, check it over a chronograph and go from there.
 
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nervoustrig said:
So long as the cartridge has a hole visible to the naked eye, it is adequate to recharge the valve after each shot. Meaning in the time it takes to load another pellet and fire.

Regarding a possible change in velocity, a new valve has the potential to change several things. Not just the valve spring itself but also its preload, the stem’s projection and therefore the hammer travel, the poppet’s sealing diameter and therefore the force required to knock it off the valve seat, and so on. None of these things are subject to any meaningful amount of break-in.

Really need to run it over a chronograph to see the result. The sound of pellets hitting the target may be a clue if your ears are well trained through repetition, but at the same time the muzzle blast may produce a misleading sound signature, making it hard to judge. For example the 2240 has way too much hammer strike in OEM form so it has a needlessly loud report. If the new valve uses a heavier valve spring or some other measure to improve CO2 consumption, it could have a very different sound at the same velocity or even at a higher velocity.

Bottom line, check it over a chronograph and go from there.
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This reply was much appreciated, friend! And if it already has too much hammer strike, I may decide not to use the .042 hammer spring I ordered. I think the stock spring is around .037 or .038, maybe? BTW, I shot it about an hour ago and the co2 canister penetration was much better. Not sure why, but better, and the shot speed improved, I think (of course, judged again by ear)
 
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Indeed .. If the valves throat is larger and seals at a greater diameter against poppet head ... At Equal pressure it will be harder to crack open.
Unless strike is increased by either spring rate, hammer weight or both you likely won't find any more power.
Ultimately no matter how hard you hit the poppet stem the systems output will be throttled by transfer size and finally with the available pressure it self.
 
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Boostcreep said:
I never got past 700 fps with 14.3s and that was with modified valve, .035 hammer spring, .156 ports, and 24 inch barrel. All testing was done in a 72° room so maybe 725 on a hot day.
Barrel length and port size are the most influential mods for velocity gains.
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24" might be too much barrel to take advantage of the CO2 released. Diminishing returns may be possible. I'm not saying it's happening, just maybe?? Try a 14-18 inch barrel? I got about 650fps from a 14-inch barrel on my 2240 with 14.3 gr Crosman domed.

Just saying from 14 inch to 24 inch did MV peak and is on it's way down OR is it still incrementally increasing? Sounds like experiment time...
 
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I have tried every length barrel crosman offers and the 24" was best on co2. Well, I never tried the 26" barrel off the maximus, but I've heard those will get you to 750 or so.

If you had a 30" barrel and highly modified valve with heavy spring, I could see 800 on a good day. For all the money invested, you'd be further ahead if you just went pcp. If I ever mod another co2 gun, it'll be for better shot count. Chasing power in co2 is moot.

I've had 900 fps from my 14" barrel 2260 pcp though lol.
 
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Boostcreep said:
I have tried every length barrel crosman offers and the 24" was best on co2. Well, I never tried the 26" barrel off the maximus, but I've heard those will get you to 750 or so.

If you had a 30" barrel and highly modified valve with heavy spring, I could see 800 on a good day. For all the money invested, you'd be further ahead if you just went pcp. If I ever mod another co2 gun, it'll be for better shot count. Chasing power in co2 is moot.

I've had 900 fps from my 14" barrel 2260 pcp though lol.
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OK fair enough. 800fps from a 22 CO2 gun would be sick cool.
 
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badger5th said:
OK fair enough. 800fps from a 22 CO2 gun would be sick cool.
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If you just want something that'll be good for small game and want to run 12g co2, I'd get a carbine stock and 14-18" barrel with a steel breech. 3-9x32 scope. Would be fine for squirrels and rabbits out to 30-50 yards depending on shot placement. I used that setup for a few years before going to the dark side.
 
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Boostcreep said:
If you just want something that'll be good for small game and want to run 12g co2, I'd get a carbine stock and 14-18" barrel with a steel breech. 3-9x32 scope. Would be fine for squirrels and rabbits out to 30-50 yards depending on shot placement. I used that setup for a few years before going to the dark side.
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I set up my first 2240 as a 14" barrel "Ratcatcher" configuration with skeleton carbine stock, Hawke red dot sight, and DonnyFL Koi moderator. Regally looked James Bond and very quiet/accurate. Regards.
 
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