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 Post subject: modding a 2289
PostPosted: Mon Mar 20, 2006 3:56 pm 
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Joined: Thu Oct 13, 2005 4:20 pm
Posts: 1550
Location: sherwood park
hey guys... fellow modders :twisted:

im currently trying to tune up a 2289 i just picked up. my goal is the legal limit at 5 pumps, so, 495 fps. right now all im getting is 375 fps at 5 pumps. i get 477 at 10 pumps. this all with the stock .22 14" barrel.

ive gone a different route this time, where modding is concerned. no major volume mods, minus the valve stem seal. i bored out the exhaust port, installed the transfer port, and put an o-ring on the back of the valve where the stem comes out. flattened the valve face, made the intake hole smaller, metal pump piston, and installed a piece of alum rod inside the valve to take up volume. i havent touched the bolt probe yet, but im using an allen key to push the pellet in further. im kinda concerned, since i SHOULD be getting better power. maybe just the stock bolt probe is too restrictive. and yes, i plugged the bleeder hole... :lol:

anyhow, im lookin for any feedback, pointers, what have you. if you guys could let me know what your modded 2289 gets at 10 pumps, i would appreciate it... 5 pumps as well.

let me know what you guys got!

later.
al.


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 Post subject:
PostPosted: Mon Mar 20, 2006 4:15 pm 
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Joined: Thu Sep 01, 2005 10:32 pm
Posts: 238
what exactly do you do to take up volume in the valve? i put a piece of plastic in the valve spring, but then the valve stem wnot go in well when the hammer hits it

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 Post subject:
PostPosted: Mon Mar 20, 2006 4:32 pm 
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Joined: Fri Sep 02, 2005 6:34 am
Posts: 1795
Location: Penetang, ON.
My chrony results:

http://www.airgunforum.ca/forum/viewtopic.php?t=2482&highlight=chronod

What I did:

http://www.airgunforum.ca/forum/viewtopic.php?t=2382

The only thing I can think of is to swap out your springs. Harder hammer, way lighter valve. You'l have to cock it before pumping, but it should dump the air faster.

Ryan


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 Post subject:
PostPosted: Mon Mar 20, 2006 9:32 pm 
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Joined: Thu Oct 13, 2005 4:20 pm
Posts: 1550
Location: sherwood park
thanx wrong way. hey, did you enlarge the main port where the stem seals inside the valve?

i found my problem though. im losing major power due to a leaking transfer port... and my bolt leaks out from the o-ring also... looks like im gonna have to build a new bolt, since the stock one doesnt close far enough.

even with the metal pump piston, and with the valve volume at about half capacity, i still cant lock up the valve... i only tried 30 pumps... but just to see :roll: once all the leaks are sealed up, i'll work on a hammer spring that will only let 500 fps out of the gun... at 5 pumps :lol:

think i can do it? :lol:


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 Post subject:
PostPosted: Mon Mar 20, 2006 10:03 pm 
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Joined: Fri Sep 02, 2005 6:34 am
Posts: 1795
Location: Penetang, ON.
NO. The only valve mods I did were to enlarge the "intake" hole to make it easier to pump, put a derlin insert in to decrease valve volume, and put in a really weak spring.

Ryan


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