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Air Gun Home Forum Index » General Air Gun Questions and Topics » First CZ tune.    View previous topic :: View next topic  First CZ tune.   Posted: Fri Dec 05, 2008 11:50 am cw Banned Joined: 10 Feb 2008 Posts: 1771 The local pawn Last edited by cw on Fri Jan 23, 2009 8:01 pm; edited 3 times in total   Posted: Fri Dec 05, 2008 2:00 pm broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands Yup, those are Slavia's alright. _________________ BIG GAP   Posted: Fri Dec 05, 2008 4:25 pm AirGunEric Site Admin Joined: 20 Jan 2007 Posts: 6930 Location: "Out There" Any way you could give us dimensions on the spring in the 630 and/or the 631? I.e. inner diameter, outer diameter, overall length, number of coils and wire thickness? I asked this awhile back, but no one seemed to know the answer! _________________ ` I'd say "I care." But I'd be lying. Canadian Airgun Supplier: http://www.scopesandammo.com/storefront   Posted: Fri Dec 05, 2008 5:02 pm cw Banned Joined: 10 Feb 2008 Posts: 1771 Sorry, Last edited by cw on Fri Jan 23, 2009 9:15 pm; edited 1 time in total   Posted: Fri Dec 05, 2008 5:12 pm broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands AirGunEric wrote: Any way you could give us dimensions on the spring in the 630 and/or the 631? I.e. inner diameter, outer diameter, overall length, number of coils and wire thickness? I asked this awhile back, but no one seemed to know the answer! Oh dear, I was supposed to check it... Sorry, I'll open it up tommorow if I can find the time... The 631 and 630 shouldn't have a different spring though. Maybe the owner had a different spring installed or something? They're a dream to work on, aren't they? _________________ BIG GAP   Posted: Fri Dec 05, 2008 7:30 pm cw Banned Joined: 10 Feb 2008 Posts: 1771 No, they Last edited by cw on Fri Jan 23, 2009 9:15 pm; edited 1 time in total   Posted: Sat Dec 06, 2008 4:36 am broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands Thats rather strange. Did you chrono the rifles? With spring guide and top hat in mine, it hits 200 Mps (655) with rather light pellets. If there really is a difference in power... Maybe the springs were changed after a certain period, to retain more power, or something along that line. _________________ BIG GAP   Posted: Sat Dec 06, 2008 9:52 am cw Banned Joined: 10 Feb 2008 Posts: 1771 Yes, I clock all guns that go though here. The 630 is doing The 631 is doinThe TEX is doing All three were chronied with grain Beeman pellets. All three guns had never Last edited by cw on Fri Jan 23, 2009 9:16 pm; edited 1 time in total   Posted: Sat Dec 06, 2008 10:13 am dummyracer36 Senior Member Joined: 21 Sep 2008 Posts: 723 Location: St. Louis, Missouri cw wrote: Yes, I clock all guns that go though here. The 630 is doing 663 fps. The 631 is doing 697.1 fps. The TEX is doing 386.7 fps. All three were chronied with 6.7 grain Beeman laser pellets. All three guns had never been opened up before I received them. The springs came different lengths from the factory. None are broken in yet. wait cw.... you fix / tune air rifles for a living? feel like takin on my chinese beeman rs2? _________________ "not tonight dear, i have a race in the morning"   Posted: Sat Dec 06, 2008 12:33 pm cw Banned Joined: 10 Feb 2008 Posts: 1771 I don't know if I would call it "for a living", but I have been doing S&R and tuning for quite some time now.   Posted: Sat Dec 06, 2008 4:29 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA I believe that CZ sold a detuned gun in the Canadian market - maybe that explains the spring difference. Or maybe not, since the difference between the 630 and 631 is not that huge... A 6.7 grain pellet at 697 FPS gives 7.23 FPE. I got my Slavia up to 625 FPS with 8.2 grain pellets, which gives 7.11 FPE. Right in the ballpark. Since then I have switched to a heavier grease on the spring. It only gives 603 FPS, but the twang is gone. You're right, they are built like tanks. Except for the 631 trigger guard and that little button on the barrel catch - both plastic. Mine broke, and are aluminum now. _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Sat Dec 06, 2008 6:10 pm broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands And again I forgot to open it up. I'm just to busy these days. I'll open it up when I DO have time. _________________ BIG GAP   Posted: Sat Dec 06, 2008 8:23 pm AirGunEric Site Admin Joined: 20 Jan 2007 Posts: 6930 Location: "Out There" Slavia wrote: I believe that CZ sold a detuned gun in the Canadian market - maybe that explains the spring difference. Or maybe not, since the difference between the 630 and 631 is not that huge... You are correct that the Canadian market got "detuned" models- but they were all detuned to have an output of less than 500fps- if the one CW had in front of him was at 663fps- this doesn't explain it. There are still a few brand new detuned Slavia 630s to be had from Canada, but literally only a few: http://scopesandammo.com/storefront/product_info.php?cPath=25_40&products_id=159 A possibility is that at some point or other, Slavia just changed spring specs. The 630/631s have been built for many years and I'm sure at least a couple of "minor" changes ('minor' from a manufacturing/assembly point of view) were likely made here and there. _________________ ` I'd say "I care." But I'd be lying. Canadian Airgun Supplier: http://www.scopesandammo.com/storefront   Posted: Sun Dec 07, 2008 2:05 am Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA Quote: The 630/631s have been built for many years Yes, production changes is a better explanation than my "Canadian spring" theory. It looks like the 630/631 goes back to about 1975 - lots of time for alterations. http://www.czub.cz/index.php?p=8&lang=en _________________ ¡Listo! ¡Apunte! ¡Fuego! 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