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Air Gun Home Forum Index » Pistols » Slavia, P17 secondary transfer port size? Goto page 1, 2, 3  Next    View previous topic :: View next topic  Slavia, P17 secondary transfer port size?   Posted: Thu Jul 10, 2008 12:26 pm cw Banned Joined: 10 Feb 2008 Posts: 1771 Slavia, I forgot Last edited by cw on Fri Jan 23, 2009 8:11 pm; edited 1 time in total   Posted: Thu Jul 10, 2008 2:46 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA With pleasure. I have to go in to work early today (safety committee), but I'll dig the stuff out when I get home. Expect an answer around 0500 CDT (1000 GMT, or UTC, or Zulu, or whatever they call it these days). _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Thu Jul 10, 2008 5:11 pm broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands Hey guys, just to keep things tidy, might it be an idea to use the personal message service on this forum? _________________ BIG GAP   Posted: Thu Jul 10, 2008 9:05 pm cw Banned Joined: 10 Feb 2008 Posts: 1771 I was Last edited by cw on Fri Jan 23, 2009 8:11 pm; edited 2 times in total   Posted: Thu Jul 10, 2008 11:49 pm AirGunEric Site Admin Joined: 20 Jan 2007 Posts: 6930 Location: "Out There" Technical info is always good to have posted publicly- but I'm going to move this to the "pistols" area of the board... _________________ ` I'd say "I care." But I'd be lying. Canadian Airgun Supplier: http://www.scopesandammo.com/storefront   Posted: Thu Jul 10, 2008 11:55 pm cw Banned Joined: 10 Feb 2008 Posts: 1771 Roger that. I will try to be more subforum specific next time.   Posted: Fri Jul 11, 2008 4:55 am Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA Is this what you are looking for? I get a diameter of 0.098", which is 2.489 mm (using 1 meter=39.37" for conversion). _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Fri Jul 11, 2008 11:17 am cw Banned Joined: 10 Feb 2008 Posts: 1771 Is that the original size or have you enlarged it? Mine was way smaller. Maybe 1.25-1.5 mm.   Posted: Fri Jul 11, 2008 4:25 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA That's original. _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Fri Jul 11, 2008 4:42 pm cw Banned Joined: 10 Feb 2008 Posts: 1771 My fault! I went back and rechecked and I had read the drill size wrong. I bored it out to 4 mm. It must have been too late last night. Thanks for your measurement, Slavia. Last edited by cw on Mon Jul 21, 2008 2:29 pm; edited 2 times in total   Posted: Sat Jul 12, 2008 10:51 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA No problem with the measurement. A 37 FPS increase doesn't seem like much, but at this scale it represents an 18% increase in kinetic energy (which is not trivial). Could you expand on what you meant by "more consistent"? _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Sun Jul 13, 2008 10:33 am cw Banned Joined: 10 Feb 2008 Posts: 1771 I surely will expound on that statement. I am experiencing a narrower standard deviation spread after said modification.   Posted: Sun Jul 13, 2008 6:08 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA Thank you so much, sir. You have a masterful command of the language, indeed. _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Mon Jul 21, 2008 11:13 am Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA You were quite right, CW. I bored mine out to 0.125" (a shade over 3mm), and here is what happened: BEFORE (0.098") Mean=409 FPS S.D.=4.84 Min.=401 FPS Max.=415 FPS AFTER (0.125") Mean=414 FPS S.D.=1.37 Min.=411 FPS Max.=415 FPS So as you said, a slight increase in (average) velocity and a noticeable improvement in spread. Going to 4mm (like you did) might give me more velocity, but I'm happy with this as it is. _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Mon Jul 21, 2008 11:35 am cw Banned Joined: 10 Feb 2008 Posts: 1771 Have you tried decreasing compression chamber head space yet? I tried it on mine and got it up to 465 fps with lasers, but accuracy was so poor as to make the pistol unusable (5 inch groop at 10 yards). To decrease head space I created a squish band (ala-motorcycle engine) at the end of the chamber. It also upped the cocking force to where the cocking lever deflected at an alarming angle. Needless to say, I returned it to it's OEM compression ratio. Last edited by cw on Mon Jul 21, 2008 2:25 pm; edited 1 time in total Slavia, P17 secondary transfer port size?     Air Gun Home Forum Index » Pistols You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum All times are GMT - 5 Hours   Page 1 of 3   Goto page 1, 2, 3  Next All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First  Select a forum Main Forums----------------AirGunHome Q&AGeneral Air Gun Questions and TopicsPicture GalleryTarget Shooting: Casual, Fun and CompetitionHunting, Pest Control, Varminting People/Events/Airgun Issue Discussion----------------Introduce YourselfThe BS TopicClubs/Events/Regional/Political Airgun Issues Maintenance, Modification and Reviews----------------RiflesPistolsAntique, Collector and Novelty AirgunsBB GunsPellets/AmmoOpticsAccessoriesAirgun Smithing Buy, Sell or Trade Forums----------------For SaleWant to Buy   Note: If you are seeing "Please enter your username and password to log in." 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