Dang buddy, you making sure that front end ain't goin nowhere huh? Loving that front plug though...I'd like to see stainless screws myself, but nobody ever accused me of good taste 😆Edit: oh my God looks like they are...must be past my bedtime
Quote from: antithesis on August 18, 2019, 11:33:52 PMDang buddy, you making sure that front end ain't goin nowhere huh? Loving that front plug though...I'd like to see stainless screws myself, but nobody ever accused me of good taste 😆Edit: oh my God looks like they are...must be past my bedtimeThe screws are standard black oxide screws that are machined down to fit the tube.The valve is pinned with 2 screws along with a SS washer pressed onto the back of the valve.The HD pump link, brass piston and 90 duro seals completes the pump engine.The idea is to minimize any movement and tube flex in a HD package that will last a long time.The saying, "They don't make them like they used to." doesn't apply here. Was able to gain 1/8" more stroke and lowered the valve volume by increasing the black spacer .050".Ran the gun over the chrony this morning with 7.9 CPHPs.The numbers in bold are the current results, the numbers in parenthesis are from the initial chrony on page 1.05 pumps 574 (557) FPS 05.78 (05.44) FPE 0900 (0800) PSI07 pumps 667 (650) FPS 07.80 (07.40) FPE 1200 (1100) PSI10 pumps 762 (736) FPS 10.18 (09.50) FPE 1600 (1400) PSI12 pumps 810 (790) FPS 11.51 (10.92) FPE 1800 (1600) PSI15 pumps 873 (855) FPS 13.37 (12.80) FPE 2200 (1950) PSI18 pumps 910 FPS 14.52 FPE 2500 PSI20 pumps (920) FPS (14.85) FPE 2500 PSIGot a nice bump up in power and made 2500 psi with 18 pumps vs 20 with the previous test.With the current pump arm leverage factor and fatty wood fore grip the gun was extremely easy to pump even to 2500 psi. It felt like I somehow was cheating the system, like playing a video game using the cheat code....LOLTo put this into perspective a 2100 would need a 13" pump arm vs the 11" it has from the factory.A 1400 would need a 21" pump arm vs the 13" stock pump arm.Since a 2100 tube was used as the base for this gun, there is room for another 1/2" of stroke with a shorter valve.That would increase FPS by 25 and a non choked barrel would add another 20 FPS or similar performance to a hot rod 2100.
What's the next logical move?My "Chubby" gun is based on a fat (hence the name) 3/4" id MK-177 tube with a similar 4" stroke.A 3/4" id by 4" stroke is equivalent to a 5/8" id by 5 3/4" stroke.It's 22 cal with an 18" Air Force (LW) barrel, PRod trigger and is super accurate.Gets 700 FPS with 10 pumps and 800 FPS with 15 pumps using 14.3 CPHPs.It's does 915 FPS with a 24" Crosman barrel and 20 pumps.Need to mod this gun similar to the 1366 with a modified NOS 766 pump link and gauge.Would like to see 740 and 840 FPS with 10 and 15 pumps with an easy pump effort.Might be a good project heading into winter.
Quote from: Tack Driver 10 on August 19, 2019, 05:00:36 PMWhat's the next logical move?My "Chubby" gun is based on a fat (hence the name) 3/4" id MK-177 tube with a similar 4" stroke.A 3/4" id by 4" stroke is equivalent to a 5/8" id by 5 3/4" stroke.It's 22 cal with an 18" Air Force (LW) barrel, PRod trigger and is super accurate.Gets 700 FPS with 10 pumps and 800 FPS with 15 pumps using 14.3 CPHPs.It's does 915 FPS with a 24" Crosman barrel and 20 pumps.Need to mod this gun similar to the 1366 with a modified NOS 766 pump link and gauge.Would like to see 740 and 840 FPS with 10 and 15 pumps with an easy pump effort.Might be a good project heading into winter. In my opinion?Up the ante to 24" af barrel, and maybe a hair more valve volume provided the room? Slightly lower pressure maintaining easy pumping, but enough barrel to capture the magic...but again, no accounting for taste.Does it gotta stay stubby? I'm told six inches makes a difference 😆
How silly of me to leave out a very important feature of the new wood pump arm.It's the new and exciting plug and play bumper technology and will keep you stealthy as you pump to your hearts content.This one is a duro 50 poly bumper........looks like a gummy candy....LOL
Quote from: Tack Driver 10 on August 19, 2019, 07:50:28 PMHow silly of me to leave out a very important feature of the new wood pump arm.It's the new and exciting plug and play bumper technology and will keep you stealthy as you pump to your hearts content.This one is a duro 50 poly bumper........looks like a gummy candy....LOLOoohh..I want! Is it prefabricated or lemme guess.... you made it like every thing else?
Can a max smoke valve be purchased? Looking to increase power in my 1300KT