Benjamin 397 power mods?
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Topic: Benjamin 397 power mods? (Read 7237 times))
sandman
Plinker
Posts: 142
yes
Real Name: Berend
Benjamin 397 power mods?
«
on:
October 08, 2013, 02:27:44 PM »
Hey folks, as you know I love multi-pump airguns and I've been thinking about getting a 397 for some time now. It looks like a solid gun, but 800 fps in .177 seems a little low (especially considering that's probably with light pellets). If I could get this gun to bark out maybe 20fpe it would truely be the gun of my dreams
. Are there mods available for the 397 similar to it's little nephew, the crosman 1377?
Sandman.
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Delft, Zuid-Holland
Crosman 1377
Gamo AF-10 4.5 mm
Record LP2 4.5 mm
Hatsan 95 4.5 mm
Diana 23 4.5 mm
Walther Rotex RM8 5.5 mm
FX Impact M3 5.5 mm
FelixK4
Guest
Re: Benjamin 397 power mods?
«
Reply #1 on:
October 08, 2013, 03:20:03 PM »
The only mods I know are from Mac1, and a user on this forum by the name of rsterne made a pcp pumper like the FX Independence by using a 397/392 pump arm and the disco tube along with other parts.
rsterne pcp multi-pump:
http://www.gatewaytoairguns.org/GTA/index.php?topic=37401.msg352455#msg352455
«
Last Edit: October 08, 2013, 03:23:53 PM by FelixK4
»
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Millipede
Sharp Shooter
Posts: 612
Aim small, miss completely.....
Re: Benjamin 397 power mods?
«
Reply #2 on:
October 08, 2013, 06:23:00 PM »
it shoots actually lower than advertised anyways and ive done lots of stuff to mine just to get it to shoot 800fps on 8 pumps using cphp. search the crosman forum using keywords like power mods, hotrod, transfer port, etc.. and you can fine tune your search a bit by using hyphens between words to search for exact phrases
http://www.network54.com/Forum/275684/
lots of cool stuff goes on with the benjamin pumpers over here
and here's the power mods stuff i did to my own 397:
http://www.network54.com/Forum/275684/thread/1363809519/the+quest+for+800+fps+on+8+pumps
I havent updated since, but i managed to get mine shooting around 805-810 using the same valve, i just got a new disco valve stem for it and sealed the transferport better. Its pretty powerful now and gets almost 19fpe on 14 pumps with the heavy eungin pellets
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Millipede
Sharp Shooter
Posts: 612
Aim small, miss completely.....
Re: Benjamin 397 power mods?
«
Reply #3 on:
October 08, 2013, 06:33:39 PM »
oh yeah and you're going to want to reinforce your pump arm so it doesnt bend over time. Theres a small notch in the metal that is the weak part. remove the pumplever and handle, compress the lever into the handle with a vice to hold steady, Drill a hole in it behind the hinge and insert another roll pin there for support
or i think you can just order a better lever from mac1. thats where i got my adjustable pump cup but i dont know if he sells just the levers too...
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Benjamin 397 power mods?