GTA
Airguns by Make and Model => Crosman Airguns => Topic started by: redlined_b16a on April 02, 2014, 06:16:24 PM
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Bought this back in 2005 left it at my brothers house and forgot I had it.
I home mooded it a good bit
cut two threads off valve,ported it big time,drilled valve and barrel 1/4" to make the poly tube go all the way thru the barrel.sealed with rtv just in case,no leaks.
shimmed and added o-ring to piston.after a week of shooootinf I noticed pumping got easier so I investigated and seen that pinning the valve was needed,my hole on the tube ovaled and valve moved.
so since I was pinning it anyway I machined another oring grove just in case cause when the factory transferport did leak my air came out the back.Now its sealed.
Homemade grade 8 1/4" steel bolt made longer with larger oring for tighter seal.
No air leakage at all.
(http://i121.photobucket.com/albums/o225/redlined_b16a/Mobile%20Uploads/C8B010C3-0DDB-4428-B23F-1B3BD1F52DCF.jpg) (http://s121.photobucket.com/user/redlined_b16a/media/Mobile%20Uploads/C8B010C3-0DDB-4428-B23F-1B3BD1F52DCF.jpg.html)
(http://i121.photobucket.com/albums/o225/redlined_b16a/Mobile%20Uploads/4782FC03-89E7-434C-8246-EB8EEF6663A5.jpg) (http://s121.photobucket.com/user/redlined_b16a/media/Mobile%20Uploads/4782FC03-89E7-434C-8246-EB8EEF6663A5.jpg.html)
(http://i121.photobucket.com/albums/o225/redlined_b16a/Mobile%20Uploads/A075D8CC-35C8-4B66-8E12-9D6295ACEE0C.jpg) (http://s121.photobucket.com/user/redlined_b16a/media/Mobile%20Uploads/A075D8CC-35C8-4B66-8E12-9D6295ACEE0C.jpg.html)
(http://i121.photobucket.com/albums/o225/redlined_b16a/Mobile%20Uploads/BFBEAFBA-8BE4-4A81-AEFC-BBBBB418A83F.jpg) (http://s121.photobucket.com/user/redlined_b16a/media/Mobile%20Uploads/BFBEAFBA-8BE4-4A81-AEFC-BBBBB418A83F.jpg.html)
(http://i121.photobucket.com/albums/o225/redlined_b16a/Mobile%20Uploads/D965A7C7-B7C6-41C7-B5BA-5594AE5EA5B4.jpg) (http://s121.photobucket.com/user/redlined_b16a/media/Mobile%20Uploads/D965A7C7-B7C6-41C7-B5BA-5594AE5EA5B4.jpg.html)
(http://i121.photobucket.com/albums/o225/redlined_b16a/Mobile%20Uploads/9B6EC0E7-6E67-4752-B7FF-C98E2C95904A.jpg) (http://s121.photobucket.com/user/redlined_b16a/media/Mobile%20Uploads/9B6EC0E7-6E67-4752-B7FF-C98E2C95904A.jpg.html)
(http://i121.photobucket.com/albums/o225/redlined_b16a/Mobile%20Uploads/857DD3DA-5D1F-492A-B1D8-F0C108675342.jpg) (http://s121.photobucket.com/user/redlined_b16a/media/Mobile%20Uploads/857DD3DA-5D1F-492A-B1D8-F0C108675342.jpg.html)
(http://i121.photobucket.com/albums/o225/redlined_b16a/Mobile%20Uploads/821AB941-F4A5-4777-A108-09F129FE30FC.jpg) (http://s121.photobucket.com/user/redlined_b16a/media/Mobile%20Uploads/821AB941-F4A5-4777-A108-09F129FE30FC.jpg.html)
(http://i121.photobucket.com/albums/o225/redlined_b16a/Mobile%20Uploads/212611A9-5DBE-44FB-95EF-6C0597610478_1.jpg) (http://s121.photobucket.com/user/redlined_b16a/media/Mobile%20Uploads/212611A9-5DBE-44FB-95EF-6C0597610478_1.jpg.html)
Stock I could pump 30 pumps with no left over air
I matched the valve face to the pump cup,the valve was 1/8" longer on the cone and did not match
The plastic piston is ovaling the pin hole so next step is home made adjustable piston.
heres my crazier next upcoming mod is using a 3/4" seal,custom piston and custom 3/4" i.d. pump tube,id like to get full power with less pumps.
no chrony but its a lot louder and shoots a lot harder than stock.
all mods are experimental,my my mods are useless and hurting performance.
im trying them anyway,Thankxz for looking