Click Here for AirGunHome.com Main Page AirGunHome.com: THE Worldwide Airgun Forum

Air Gun Home Forum Index » Rifles » Anyone ever drill out the transfer port on a phantom/quest? Goto page 1, 2  Next    View previous topic :: View next topic  Anyone ever drill out the transfer port on a phantom/quest?   Posted: Wed May 20, 2009 11:33 am aircube Veteran Member Joined: 02 May 2009 Posts: 261 Hey, anyone ever drill out the transfer port on a phantom/quest or any other of its variants? I have read that increasing it to 1/8" or 0.125" can raise the FPS by about 100 I have also read that its a good way to cause more recoil and psiton slap. Anyone tried it?   Posted: Wed May 20, 2009 11:42 am broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands Not tried it, but using heavier pellets you can reduce that increase of recoil and piston slap. _________________ BIG GAP   Posted: Wed May 20, 2009 11:55 am Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA I read someplace that the transfer port also contributes to piston braking, and opening it up means your are stuck using heavy pellets to prevent that "piston slap." _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Wed May 20, 2009 12:03 pm aircube Veteran Member Joined: 02 May 2009 Posts: 261 Anyone know what the stock size is?   Posted: Wed May 20, 2009 12:58 pm Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA Quote: Anyone know what the stock size is? Just eyeballing my G1 with the calipers, I get 0.103" - but since it is a Chinese gun that probably means 2.5mm, which would be 0.098. _________________ ¡Listo! ¡Apunte! ¡Fuego!   Posted: Wed May 20, 2009 1:22 pm aircube Veteran Member Joined: 02 May 2009 Posts: 261 Thanks Slavia   Posted: Thu May 21, 2009 1:30 am blas Member Joined: 04 Apr 2008 Posts: 19 Location: Estonia Good reading: http://www.pyramydair.com/blog/2008/10/air-transfer-port-part-1.html http://www.pyramydair.com/blog/2008/10/air-transfer-port-part-2.html http://www.pyramydair.com/blog/2008/11/air-transfer-port-part-3.html   Posted: Thu May 21, 2009 1:47 am aircube Veteran Member Joined: 02 May 2009 Posts: 261 Thanks Blas, Looks like there somebenefit to opening it up to 1/8" .125" or so. WHat is that about 3 mm?   Posted: Thu May 21, 2009 11:59 am rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC 3mm = 0.118" Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count!   Posted: Thu May 21, 2009 12:28 pm aircube Veteran Member Joined: 02 May 2009 Posts: 261 Heres are two quotes from the pyramid air article Blas posted: "0.110" limited the velocity available in the .22 caliber barrel shooting .22caliber Crosman Premiers by about 50 f.p.s., and a port size of 0.125" gave the highest velocity recorded." "A larger port of 0.145" gave identical velocities as the 0.125" port, but 0.155" was about 20 f.p.s. slower. The optimum range of port sizes for a .22 caliber Beeman R1 falls between 0.125" and 0.145"." There was a drop in velocity when a .177 port is opened up too much as well, which leads me to believe that the port size in a gun like the phantom may be a compromise between the ideal port size for .177 and .22 so that they can be tooled the same. So would 1/8" to 9/64" (0.125" to 0.141") be optimum for a .22 Phantom? I am thinking sticking to 1/8" might be the better choice as it offer the hichest vel, and may still offer some cushion effect for the piston.   Posted: Thu May 21, 2009 12:28 pm blas Member Joined: 04 Apr 2008 Posts: 19 Location: Estonia Here's a hell of a converter:) http://www.peters1.dk/webtools/conversion.php?sprog=en   Posted: Thu May 21, 2009 12:42 pm rsterne Moderator Joined: 15 Jan 2008 Posts: 2998 Location: Coalmont, BC Why would you go bigger than 1/8" if the available data says there is no advantage, and you could possibly do damage to the piston / seal?.... In addition, how is the data for a Beeman R1 (HW80) relevant as it has a much larger swept volume than a Phantom.... and could therefore use a bigger transfer port efficiently?.... Bob _________________ Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since! Airsonal: Too many to count!   Posted: Thu May 21, 2009 1:42 pm aircube Veteran Member Joined: 02 May 2009 Posts: 261 rsterne wrote: Why would you go bigger than 1/8" if the available data says there is no advantage, and you could possibly do damage to the piston / seal?.... In addition, how is the data for a Beeman R1 (HW80) relevant as it has a much larger swept volume than a Phantom.... and could therefore use a bigger transfer port efficiently?.... Bob Why go bigger than 1/8", umm, i'm not. I said it looks like 1/8" is ideal and the stock 0.103" may be a std midrange size intended for both .177 and .22 Re the Beeman R1: Well, its just talk and experimentation. I read online that someone gained about 100fps drilling a Phantom out to 1/8" I am fully aware that it "might" have negative effects on the internals... But all in good fun   Posted: Thu May 21, 2009 10:53 pm Amigo Veteran Member Joined: 18 Sep 2008 Posts: 263 Location: U.S. MidWest Slavia wrote: I read someplace that the transfer port also contributes to piston braking, and opening it up means your are stuck using heavy pellets to prevent that "piston slap." Slavia knows what he is talking about and I second it. I too have read posts on other forums about enlarging the transfer port in a .177 cal. Quest/Phantom. Most of those posts were authored by self serving boneheads and bullshitters. However, if you want to limit your pellet selection to 10 grains or heavier with reduced velocity, a high arch trajectory and a POA - POI range of only a few feet, by all means have at it. On the other hand, if you would rather not waste time reinventing the wheel of airguning and enable yourself to discern the wheat from the chaff: www.amazon.co.uk/Airgun-Trigger-Target-G-V-Cardew/dp/0950510823/ref=sr_1_1?ie=UTF8&s=books&qid=1210277905&sr=1-1 The Amazon site always seems to indicate they are temporarily out of stock, but order it anyway. You will probably have it within 30 days and your CC Co. will handle the exchange rate. Todays U.S. dollar to British Pound rate is 1 Pound = $1.5857 U.S. dollar. Don't forget to put U.S.A at the bottom of your address. Happy airgunning, Amigo   Posted: Fri May 22, 2009 7:08 am Slavia Moderator Joined: 31 Mar 2008 Posts: 4382 Location: Waseca, Minnesota, USA Go down to the public library and ask them to find the title you want through interlibrary loan. The copy I borrowed came from Seattle. It's free. _________________ ¡Listo! ¡Apunte! ¡Fuego! Anyone ever drill out the transfer port on a phantom/quest?     Air Gun Home Forum Index » Rifles 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 2   Goto page 1, 2  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." Your browser cookies have been reset or you need to register to access the topic in question. Use the 'Register' button near the top left of this page. Click Here for AirGunHome.com Main Page Powered by phpBB © 2001-2004 phpBB Group Partial Styling Supplied by Vjacheslav Trushkin Themes Database.