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Old 10-01-2012, 12:56 PM   #8551 (permalink)
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I wouldn't really mess with the thumpers internal chambers, to be honest. Quality o-rings and a good inline reg set to no more than 290-300psi (absolute max) will solve velocity issues, well, unless something else is to blame like your barrel or something.

In terms of mod's the internal reg, joe was spot on. But again though, I'd suggest you avoid the issue totally by adding an inline reg.

I've never ran either of my babies on hpa/co2 without first regulating the pressure down to 280psi or so via my inline reg (again, never more than 300psi). In terms of tank pressure in this case, it doesn't really matter - it is dependent on your inline reg and whether it requires a certain amount of pressure.

Generally, you want to keep you tank's output at least 200psi above the output pressure of the reg it is connected to. So, if you were running hpa into your thumper's internal reg, you don't want to use anything less than about 500psi. This is speculation on my part, because I have no confidence in the thumper's internal reg, but it does apply to most other regs out there (such as a stabilizer).

With my 2L plus dual, I run my tank's output at 650psi, although sometimes I also use a 850psi output tank with no noticeable problems (this is, after all, a pump).

I mod'd both of my thumper's internal regs to keep them both permanently open because I was confident that my inline regs (both AKA regs) would do the job better. And they have. I also used a shim setup in one of them to keep the reg from functioning; in the other I use a little delrin insert/devolumizer I found in a gear box.

As joe stipulated, the gun is working as low as it can to begin with (although I have yet to try Metadyne's "new" piston assembly, as it requires sending my thumper backto metadyne which I'm not comfy doing). Running it at a lower pressure would certainly be better for the actuating valve (although at some point you would probably get diminishing returns).

I doubt a thumper working at a lower pressure would get the internal reg to work better. Possibly, but I really have no faith in that reg now. I blame all of the thumper's problems (minus o-ring issues) on it!

I hate to sound like a broken record, you're really best off finding a reliable inline reg (there are so many out there, you don't need anything fancy, certainly don't have to spend more than $20 to find a good used one - joe had really good results with old stock wgp reg that is only internally adjustable).

I'm pretty convinced the only way to reliably avoid grief from the internal reg is to eliminate it altogether! but seriously, this has worked for me... initially I didn't shim the internal reg on one thumper, so I could use it to fine tune velocity. I set my inline reg to 290psi, and ended up needing to screw the internal reg about 1.25 turns from flush into the marker to achieve 280fps. But I have since just shimmed it up to keep it open, as I was experiencing weird velocity patterns when my tank go low (<800psi). Now it relies totally on an inline regulator.

Using the internal reg to fine tune velocity after setting an internal reg to = or < 300psi worked well for joe, if I remember correctly.

Last edited by toymachine; 10-01-2012 at 01:00 PM.
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Old 10-01-2012, 01:09 PM   #8552 (permalink)
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For about 3 months ive been breaking in my thumper since it came back from metedyne with oring issues. After that happened i looked at diffrent oring materials and i found the eclipse oring fix. And brainstormed locally about the input pressure. I can vouch that if you add an inline reg and decrease your input pressure between 250-300 it takes alot of stress off the internal reg. Im about 1000 dry fire/rounds threw my thumper, and it has'nt wanted to go down or chop any orings. I dont use grease or vaseline. I drop a few drops of oil and i barely take the gun apart. Hope this can add to toymachine and joedirts success on external regulating and fine tuning with the internal.

I figure ide make a comment now that i read more and more owners trying to double regulate their thumpers.

Joe D.
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Last edited by ~spd3~; 10-01-2012 at 01:13 PM.
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Old 10-01-2012, 03:55 PM   #8553 (permalink)
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I recently got one of these and I would have like to use it as a stock class marker with the factory quick change, but I guess I will find me a cheap WGP or CP reg and put the CO2 in a bottomline.

How do you disable the internal reg? Do you shim the spring and crank it all the way in?
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Old 10-01-2012, 04:29 PM   #8554 (permalink)
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Quote:
Originally Posted by redlaser666 View Post
I recently got one of these and I would have like to use it as a stock class marker with the factory quick change, but I guess I will find me a cheap WGP or CP reg and put the CO2 in a bottomline.

How do you disable the internal reg? Do you shim the spring and crank it all the way in?
I'll try to sit down and take mine apart when I get a chance, so I can give you some pics of how I disabled the reg. In terms of using 12gs with the thumper, I don't suggest using the CART reg/12g changer combo.

You didn't mention it, but I just wanted to point that out. Way harder to use than a standard inline reg connected to the stock 12g changer mounted with or without a stock on a normal asa on the trigger frame. Although, this means you need to get either a CCI 45 frame, a Metadyne 45 frame, or a euro grip and bottom line adapter or something alone those lines, but all that's worth it anyways, so you can switch to CA if you'd like down the road.

Quote:
Originally Posted by ~spd3~ View Post
For about 3 months ive been breaking in my thumper since it came back from metedyne with oring issues. After that happened i looked at diffrent oring materials and i found the eclipse oring fix. And brainstormed locally about the input pressure. I can vouch that if you add an inline reg and decrease your input pressure between 250-300 it takes alot of stress off the internal reg. Im about 1000 dry fire/rounds threw my thumper, and it has'nt wanted to go down or chop any orings. I dont use grease or vaseline. I drop a few drops of oil and i barely take the gun apart. Hope this can add to toymachine and joedirts success on external regulating and fine tuning with the internal.

I figure ide make a comment now that i read more and more owners trying to double regulate their thumpers.

Joe D.
Great! Love seeing creative folks like you overcoming the odds and enjoy that greatness which the thumper has to offer

From what I understand, the actuating valve does not like oil lubricants (or any lube at all), so you might want to rethink that approach. Then again, if you're put 1k shots through her and she's working, why ruin a good thing. Just keep an eye out, that's all.
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Old 10-01-2012, 04:41 PM   #8555 (permalink)
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@ Toymachine, Likewise. I like the thumper, for me the challenges made it worth keeping it and not dumping it on the market. I think once people do these tweaks, they will enjoy them more rather than less.

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Last edited by Brewtt; 10-03-2012 at 03:00 PM.
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Old 10-01-2012, 04:45 PM   #8556 (permalink)
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I run my Thumper exclusively on 12 grams through the standard vert asa/ bucket changer, and the only problem I've had is my valve freezing every once in a great while (happens when I shoot too much too fast)

In fact, I used to use Crosmans to keep it lubed, but now it's on a steady diet of Lelands, without any major tear-it-apart-and-rebuild-it issues.
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Old 10-01-2012, 04:48 PM   #8557 (permalink)
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Looks like the only fix would be to drill a spot in the 12 gram adapter, and throw in an internal reg like the middle block has on it.
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Old 10-01-2012, 05:57 PM   #8558 (permalink)
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Quote:
Originally Posted by joedirt199 View Post
the fix for this was putting small washers in the regulator piston cap to give the spring a little more pressure. problem is we found out that the internal reg works fine as long as you regulate the air going into the marker. myself and toymachine have put an external reg in and set it below 300 psi, mine is around 280-270 and toy's is set to about 250 psi. this helps the internal reg do its job better. i use my internal reg for velocity adjustment and toy has eliminated his internal reg all together.
Awesome, I will look into a inline reg and some washer.
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Old 10-01-2012, 06:13 PM   #8559 (permalink)
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nice input toymachine. Wonder if mine would benefit from what yours is functioning with. Anthony?
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Old 10-01-2012, 08:41 PM   #8560 (permalink)
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Quote:
Originally Posted by LilShank View Post
I run my Thumper exclusively on 12 grams through the standard vert asa/ bucket changer, and the only problem I've had is my valve freezing every once in a great while (happens when I shoot too much too fast)

In fact, I used to use Crosmans to keep it lubed, but now it's on a steady diet of Lelands, without any major tear-it-apart-and-rebuild-it issues.
lucky bastard

I'd love to run a thumper successfully without needing to use an extra reg...
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