2” Plenum Extension - FX Dreamline

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I thought about the same idea when seeing that plenum space but the vent hole steered me away from it, glad you took on the challenge! Having to buy a bigger tube kind of sucks but man it really does make for a sweet rig.
thanks for taking the time to share. Could you perform the same operation on your streamline? That’s the gun I was considering it for. I ha e the .22 and think we’re talking about the same .25 tube.
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Same tube, but the .25 caliber’s air cylinder would extend beyond the .22 Streamline’s 500mm ST barrel. Don’t give up though because there are other options. FX’s new DL plenum that they are coming out with would probably fit the Streamline, and Huma-air.com is selling right now a regulator with an extended plenum. So, there are possibilities... 



https://www.huma-air.com/FX-Streamline-Power-Plenum-XL-Set-With-Tuning-Regulator

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https://www.huma-air.com/FX-Dreamline-Power-Plenum-XL-Set-With-Tuning-Regulator

1580436986_16763859905e338dfa1eb218.55336582_7317A1B4-07E3-4156-97DC-AF23A323F73C.jpeg



https://www.huma-air.com/FX-Wildcat-Power-Plenum-XL-Set-With-Tuning-Regulator
1580437042_5686514745e338e32f05d56.62652741_04C40EC4-12F5-4094-8B72-E1F1A255D27B.jpeg



https://www.huma-air.com/FX-Dreamline-Internal-Power-Plenum-XL-30cc

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Ideas anyone?






 
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Well done, that is just so sensible. At the risk of asking a stupid question, did the bigger tank you ordered not already have a hole drilled in it? I guess it didn't, and they would expect the purchaser to drill a hole for the reg. And allow me one more dumb question, but I take it the hole for adjustment doubles as the breather hole too?
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Not dumb at all... Yes, they come with no vent hole, pre-drilled has a slightly extra $ fee and is available upon request. The second question’s answer is also yes.
 
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A couple tips he didn’t mention in the video.



1. Make sure you drill the hole as square to the wood surface as possible.

2. Choose a drill bit size that is at least as large as the solid diameter of the stud. You can mic it or just eye it by aligning a bit with the screw and comparing the base of the drill bit to the thread minor diameter. If your hole is smaller than the studs solid diameter the stud will try to expand the hole and that’s when it splits.

3. Besides using a punch to keep the drill from walking it is also not a bad idea to start with a smaller drill and then go to your final drill size as a second step. A smaller bit is easier to locate. This will also allow the larger drill to “clean” up any messy surface you might have created if you let the drill tilt back and forth initially and will give you more control.

4. Drill slow. Sharp bit. Very little pressure. If you have a variable speed drill use the lower speed setting.

5. Applying a bit of bar soap to the screw stud for lubrication will make it easier to turn in and make it less likely to tilt.

6. Speaking of tilt watch carefully to make sure the stud follows the same angle as your screw hole.

7. Don’t over tighten it. When the stud base touches the wood just turn enough further to align the hole in the stud perpendicular to the stock. If you over tighten you can split the stock or cause a splinter of wood to raise around the stud.
 
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Conclusion:

"I’m proud of myself and this airgun! To transform this DreamPup from a 30 fpe pellet shooter to a 44 fpe slug gun is an accomplishment."

You should be. Nice job with limited tools. Dumb question. Could you make large round holes in that part? Removing material to gain another small % of plenum space. I may not fully understand exactly how that part works in your gun. Just a dumb thought. Again great job, 30 FPE to 44 FPE. Sure is rewarding to do something like that. 2 thumbs up!!! 

I built a slug gun last winter based on the same large plenum low reg. pressure (120 Bar) principal with good results. I even added a plenum extension to it, for more efficient power. 

#3 above - Besides using a punch to keep the drill from walking it is also not a bad idea to start with a smaller drill and then go to your final drill size as a second step. 

I'd recommend a center drill after the punch in that process. 
 
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JKool & BRagu, I'm fast becoming a fanboy of yours 😂, very very impressive. I am slowly getting to know my new Wildcat, it's shooting perfectly with the AMP regulator set at 125bar, no creep and ES in single digits. I will buy a power plenum when I'm confident enough to tear down the gun or if I run into creep problems, but for now I have to learn to shoot good groups at +80 yards 👀

One question, that Huma power plenum will work with the Huma reg only, its not working with the FX AMP reg, it's that correct?

Christian
 
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Why is that regulator gauge opening so crude looking? Is that how the gun came from FX - or did you have to modify with a dremel?
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It’s a optical illusion. Lol! It is the reflection from the flash on my camera blinging off of the chrome Huma gauge onto the anodized finish. It is not scratched just looks that way... just a reflection.



Conclusion:

"I’m proud of myself and this airgun! To transform this DreamPup from a 30 fpe pellet shooter to a 44 fpe slug gun is an accomplishment."

You should be. Nice job with limited tools. Dumb question. Could you make large round holes in that part? Removing material to gain another small % of plenum space. I may not fully understand exactly how that part works in your gun. Just a dumb thought. Again great job, 30 FPE to 44 FPE. Sure is rewarding to do something like that. 2 thumbs up!!! 

I built a slug gun last winter based on the same large plenum low reg. pressure (120 Bar) principal with good results. I even added a plenum extension to it, for more efficient power. 

#3 above - Besides using a punch to keep the drill from walking it is also not a bad idea to start with a smaller drill and then go to your final drill size as a second step. 

I'd recommend a center drill after the punch in that process.
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I don’t believe that I would gain much by enlarging the hole. In fact, the hole is drilled through and through both sides of the 2” plenum extension. This was to utilize all the air, even the tiny bit in the millimeter of space between the walls of the spacer and the air cylinder tube. Plus, I don’t want to jeopardize the strength of the plenum extension and have it fail.



JKool & BRagu, I'm fast becoming a fanboy of yours 
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, very very impressive. I am slowly getting to know my new Wildcat, it's shooting perfectly with the AMP regulator set at 125bar, no creep and ES in single digits. I will buy a power plenum when I'm confident enough to tear down the gun or if I run into creep problems, but for now I have to learn to shoot good groups at +80 yards 
1f440.svg


One question, that Huma power plenum will work with the Huma reg only, its not working with the FX AMP reg, it's that correct?

Christian
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It would work but you would lose your external adjustability (AMP regulator), and high pressure air space volume (the AMP reg. is 3x bigger than the Huma reg). Also, to successfully use the Huma power plenum you would have to remove the o-ring closest to the airguns block to utilize the vent hole. Hope that makes sense, you need a vent hole for most all tube / cylinder regulators.



FX AMP REGULATOR: 



1580671947_3489586195e3723cbe95a99.27698077_BAA410AA-0CEF-40BC-AB81-F5F5C7FC14BA.jpeg



HUMA REGULATOR:



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Joe, do you happen to know what CC volume the AMP and Huma take up in the air cylinder?

Thanks for taking the time to design and share. I will add this to the "to do" list for my .25 DL classic.
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I wish I new the answer to that also... Unfortunately, high school algebraic equations was over 20 years ago for my brain. I don’t know? 🤷🏽‍♂️


I just want to say thank you for sharing your amazing new build!! It's really nice great job FX should do this because it makes much more sense and proof is in your testing. Awesome work.
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Thanks, but I wouldn’t do all what I did if I where you, because FX’s Dreamline power plenum is soon to hit retailers and will probably have very similar results. It will be a much easier modification or accessory to add (just screw it on) and will be warranted. As a matter of fact I have preordered 2 of them, because there’s more up my sleeve for my airgun’s.



https://www.airgundepot.com/fx-dreamline-power-plenum.html



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“By adding this Power Plenum, the chamber is increased by 17 cc, making it capable of increasing the velocity of your Dreamline by up to 130 fps (dependent on caliber and pellet weight).”



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I don’t believe that I would gain much by enlarging the hole. In fact, the hole is drilled through and through both sides of the 2” plenum extension. This was to utilize all the air, even the tiny bit in the millimeter of space between the walls of the spacer and the air cylinder tube. Plus, I don’t want to jeopardize the strength of the plenum extension and have it fail.

I didn't word things right again. If you drill lots of holes approx. 1/2" in that spacer to reduce it's volume within the plenum is what I meant. "Swiss Cheese" it. Not so close to each other that the structural integrity of the spacer is lost. But I think you could safely gain a bit more volume than the millimeter of space between the walls of the spacer and the air cylinder tube. Hope that made sense...
 
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I don’t believe that I would gain much by enlarging the hole. In fact, the hole is drilled through and through both sides of the 2” plenum extension. This was to utilize all the air, even the tiny bit in the millimeter of space between the walls of the spacer and the air cylinder tube. Plus, I don’t want to jeopardize the strength of the plenum extension and have it fail.

I didn't word things right again. If you drill lots of holes approx. 1/2" in that spacer to reduce it's volume within the plenum is what I meant. "Swiss Cheese" it. Not so close to each other that the structural integrity of the spacer is lost. But I think you could safely gain a bit more volume than the millimeter of space between the walls of the spacer and the air cylinder tube. Hope that made sense...
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1580834252_4279166625e399dcc0be7f3.94731051_FB914781-1DA9-4C61-8A2B-3B2DCC00138D.jpeg




l picked up on what you where putting down the first time.🙂

Still, the gain would probably be minuscule. In no way am I knocking your idea, it’s just she is shooting superbly already! Don’t need the change. 918 fps to 930 fps seems to be a sweet spot. With this 600mm slug liner and 23 grain NSA’s.
 
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Thanks, but I wouldn’t do all what I did if I where you, because FX’s Dreamline power plenum is soon to hit retailers and will probably have very similar results. It will be a much easier modification or accessory to add (jus it on) and will be warranted. As a matter of fact I have preordered 2 of them, because there’s more up my sleeve for my airgun’s.



Are you thinking of stacking the plenums to double the volume?
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Thanks, but I wouldn’t do all what I did if I where you, because FX’s Dreamline power plenum is soon to hit retailers and will probably have very similar results. It will be a much easier modification or accessory to add (jus it on) and will be warranted. As a matter of fact I have preordered 2 of them, because there’s more up my sleeve for my airgun’s.



Are you thinking of stacking the plenums to double the volume?
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Well... Yes and no. Stacking the plenums is something I will try, but I think that will result in too much messy air that will degrade my accuracy. Just like having too much hammer spring tension when tuning a PCP.



My plans... Gosh I am telling you guys everything... Is to put the FX power plenum on the spare .25 air cylinder tube (290cc, didn’t know I had two did ya?) and drill the vent / AMP adjuster hole at the factory measured length. (Push it back). Then I will have even more high pressure air volume to work with. Equaling even more efficiency aka higher shot count.



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