GTA
All Springer/NP/PCP Air Gun Discussion General => PCP/CO2/HPA Air Gun Gates "The Darkside" => Topic started by: AEROMAGNUM on October 16, 2017, 03:04:59 PM
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Hello,
was wondering if anyone might know where one can find a tuned valve for the P-rod .22?
Would like to squeeze as much power from the P-rod .22 as possible.
Ordered a 16-inch barrel for it today, that will be threaded for a custom made moderator. Hoping the additional 4-inches of barrel length will assist in fps increase.
Any information about a power tuned P-rod valve, will be greatly appreciated.
Happy/Safe Shooting,
A. Clark/Aeromagnum, LLC
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My P rod shoots JSB 18,1 at 25FPE with the original barrell,regulated at 2000psi,the port path is opened to .165 (transfer port,barrell and valve).
Don't know your power objective,but maybe you can do some with a little valve work.
Hillsairguns sells a Prod kit tough.
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almost ready for production!!!
https://www.gatewaytoairguns.org/GTA/index.php?topic=131714.0 (https://www.gatewaytoairguns.org/GTA/index.php?topic=131714.0)
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Wow,impressive work!
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almost ready for production!!!
https://www.gatewaytoairguns.org/GTA/index.php?topic=131714.0 (https://www.gatewaytoairguns.org/GTA/index.php?topic=131714.0)
Please do keep me informed. You have my email.
Regards,
Al.
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T
My P rod shoots JSB 18,1 at 25FPE with the original barrell,regulated at 2000psi,the port path is opened to .165 (transfer port,barrell and valve).
Don't know your power objective,but maybe you can do some with a little valve work.
Hillsairguns sells a Prod kit tough.
Thank you for the input. I am seeking 30+fpe. My HOPES are the the additional 4-inches of barrel length, opening the transfer port and having a tuned valve....will get me to my goal.
If I can get at least 1-to-2 magazines worth of shots per fill, that too would be great.
Regards,
Al.
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Your best bet is to wait on the valve from Travis. His initial prototype met your power requirements, and not aware of any other prod valves that can.
The gains of the 4" of barrel, will depend on how efficient it is with the 12". The more efficient it is, the less you will see in "free" gains. If it is wasting air at that power, then you will probably see some. Most of the gains per inch of barrel calculations, are based on dump valve type guns, like 1377. I saw great gains on them with barrel changes. On a Prod, I swapped out a 12" barrel for a 20" mrod barrel without touching the tune. Only saw a 1FPE gain.
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When striving for power, longer barrels almost always help....
Bob
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When striving for power, longer barrels almost always help....
I agree, but sometimes the expectations are not close to reality.
I am interested in the results, regardless. :)
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When striving for power, longer barrels almost always help....
Bob
Hello Bob,
This morning I watched a video of an Airgunner adding a 13ci regulated bottle from JDS Airman.
Unfortunately, he does not tell of any advantages to this modification.
What are your thoughts?
https://youtu.be/5BFw27EYLCM
Regards,
Al.
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I have a similar setup,if you are looking for maximum power,a regulator is not the right way.my 13ci bottle setup is regulated a bit above 2000psi and shoots 18,1 pellets at 25FPE,to obtain more power the regulated pressure must be increased resulting in less usable air,the advantage in my setup is a flat string of about 60 shots,increase the regulator pressure above this point can reduce the shot count nulling the advantage of a bottled setup.
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I would love to put a bottle on my Maximus. Suggestions appreciated!
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I would love to put a bottle on my Maximus. Suggestions appreciated!
you could shorten the tube and use the regular tank drop adapter commonly used for the 2240.. especially if you used a regulated tank.or go this route and stay full length
https://www.ebay.com/itm/CUSTOM-TANK-BLOCK-Crosman-2240-2300KT-2400KT-Benjamin-Discovery-Maximus-/122399559046?hash=item1c7f950d86:g:X3IAAOSwX9FZEoZR (https://www.ebay.com/itm/CUSTOM-TANK-BLOCK-Crosman-2240-2300KT-2400KT-Benjamin-Discovery-Maximus-/122399559046?hash=item1c7f950d86:g:X3IAAOSwX9FZEoZR)
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Thanks Rob!
I already have a cf bottle, and would like to keep the Huma in the tube after bottle. 8)
Knife
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I have a similar setup,if you are looking for maximum power,a regulator is not the right way.my 13ci bottle setup is regulated a bit above 2000psi and shoots 18,1 pellets at 25FPE,to obtain more power the regulated pressure must be increased resulting in less usable air,the advantage in my setup is a flat string of about 60 shots,increase the regulator pressure above this point can reduce the shot count nulling the advantage of a bottled setup.
Thank you.
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Typical rookie mistake on that bottled PRod in the video, IMO.... There appears to be very little volume between the gauge block and the back of the tank block.... ie no real plenum.... This severely restricts the FPE you can get at any given regulator setpoint pressure.... Ideally, if you want 25 FPE, you should have about 25cc of plenum.... A 3" space between the front of the gauge block and the back of the tank block insert in a PRod would be about 21.4 cc, which once you include the volume inside the gauge block and valve would be pretty close.... If you want more power, you should leave even more tube length between for more volume.... about 1 cc of plenum per FPE is ideal....
Bob
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I have been able to get over 25 fpe with the huma and its .25 plenum. Set at 1875 I could get right at 30 fpe. \
Removed a 53 gram Challenger hammer and installed a 38 gram MSD and my fpe has plummeted. Just over 15 fpe.
Going to see if Rocker1 one can make up a hammer with a bit more weight.
I know everyone and their brother goes light on the hammer. However, the hammer stroke on the Maximus is ridiculously short. Needs hammer weight, and or spring to make any power.
Knife
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Typical rookie mistake on that bottled PRod in the video, IMO.... There appears to be very little volume between the gauge block and the back of the tank block.... ie no real plenum.... This severely restricts the FPE you can get at any given regulator setpoint pressure.... Ideally, if you want 25 FPE, you should have about 25cc of plenum.... A 3" space between the front of the gauge block and the back of the tank block insert in a PRod would be about 21.4 cc, which once you include the volume inside the gauge block and valve would be pretty close.... If you want more power, you should leave even more tube length between for more volume.... about 1 cc of plenum per FPE is ideal....
Bob
You are right Bob,i forgot to say on my setup i lefted as much tube lenght as possible,the gauge block is enlarged and the valve cap and internals are reworked to gain some regulated volume,even the offset adapter is countersunked valve side and the shroud has a little spacer action side to gain some tube lenght and lefting some clearance for the "muffler"
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almost ready for production!!!
https://www.gatewaytoairguns.org/GTA/index.php?topic=131714.0 (https://www.gatewaytoairguns.org/GTA/index.php?topic=131714.0)
Very Cool 8)
The only thing that would be different if I did it all over again would be a Rocker1 LDC instead of the TKO.
(https://farm5.staticflickr.com/4480/36900809534_799893b708_b.jpg)
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I have been able to get over 25 fpe with the huma and its .25 plenum. Set at 1875 I could get right at 30 fpe. \
Removed a 53 gram Challenger hammer and installed a 38 gram MSD and my fpe has plummeted. Just over 15 fpe.
Going to see if Rocker1 one cam make up a hammer with a bit more weight.
I know everyone and their brother goes light on the hammer. However, the hammer stroke on the Maximus is ridiculously short. Needs hammer weight, and or sporing to make any power.
Going to the lighter hammer usually requires going to a lighter poppet spring, or a heavier hammer spring to get to the same power. The maximus has the same throw as a prod, about 1/2". My maximus air tubed prod, maxes out at about the same as yours. I think any more that that, you will need to increase pressure or make plenum larger.
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FuzzyGrub, what modifications were required to use a Maximus tube with the Prod internals and breech? more air is always better especially when you want power and shot count. thanks in advance
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FuzzyGrub, what modifications were required to use a Maximus tube with the Prod internals and breech? more air is always better especially when you want power and shot count. thanks in advance
You have to drill holes in the air tube for the breech screws. If you want to use to 3Kpsi, will need to enlarge one hole for the valve retaining screws. Also, a slight mod need to Prod valve to use that larger screw head. I detailed the work in the following thread. Please be advised by the warning there.
https://www.gatewaytoairguns.org/GTA/index.php?topic=122634.0 (https://www.gatewaytoairguns.org/GTA/index.php?topic=122634.0)
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FuzzyGrub, what modifications were required to use a Maximus tube with the Prod internals and breech? more air is always better especially when you want power and shot count. thanks in advance
You have to drill holes in the air tube for the breech screws. If you want to use to 3Kpsi, will need to enlarge one hole for the valve retaining screws. Also, a slight mod need to Prod valve to use that larger screw head. I detailed the work in the following thread. Please be advised by the warning there.
https://www.gatewaytoairguns.org/GTA/index.php?topic=122634.0 (https://www.gatewaytoairguns.org/GTA/index.php?topic=122634.0)
Thank you sir! Now to get that tube ordered. This is why i love air guns. One project ends and then someone says something and boom, new project!
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question , how much is the p-rod breech from crosman ?? I gota ask one day , I call and forget about things I meant to check
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question , how much is the p-rod breech from crosman ?? I gota ask one day , I call and forget about things I meant to check
I don't have recent pricing, but found a price of $44 in an old spreadsheet. That does not include the bolt.
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thanks John , that makes perfect sense.. not bad compared to a BNM
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Typical rookie mistake on that bottled PRod in the video, IMO.... There appears to be very little volume between the gauge block and the back of the tank block.... ie no real plenum.... This severely restricts the FPE you can get at any given regulator setpoint pressure.... Ideally, if you want 25 FPE, you should have about 25cc of plenum.... A 3" space between the front of the gauge block and the back of the tank block insert in a PRod would be about 21.4 cc, which once you include the volume inside the gauge block and valve would be pretty close.... If you want more power, you should leave even more tube length between for more volume.... about 1 cc of plenum per FPE is ideal....
Bob
Noted.
Thank you Bob!
Regards,
Al.
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Today I finished the final PRod valve specs and now we can finally get to producing them. Took a lot of work but I’m done and SUPER happy with the outcome.
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Today I finished the final PRod valve specs and now we can finally get to producing them. Took a lot of work but I’m done and SUPER happy with the outcome.
Great news Travis... do you have an estimate about the price for each unit? (p-rod, m-Rod, kral, etc)
Regards
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Today I finished the final PRod valve specs and now we can finally get to producing them. Took a lot of work but I’m done and SUPER happy with the outcome.
:) strings?