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Old 11-13-2012, 10:31 AM   #8661 (permalink)
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Has a stainless piston been tried? if someone knows if Brian did or did not try it let me know so I know if Iwould be waisting time making one.
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Old 11-13-2012, 10:39 AM   #8662 (permalink)
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So far as I can tell the new piston is the same length as the old one but the o-ring placement on the piston head is slightly lower.
My thought is that: the air filling the dump chamber is just escaping for a fraction of a second before the piston head seals the chamber.
I am going to try a spacer between the head and the shaft but I dont want to make the piston to long.
I have sent an e-mail to Brian to ask his advise.

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Maybe reg spiking could also be a contributory factor?
I am running a secondary regulated co2 bottle at around 250-300 psi. its not the most consistent of regs, but it is working. it relieves the stress of the internal reg having to deal with high pressure. one of the ways the Thumper use to fail was the internal reg would lock forward. you would be shooting and all of a sudden nothing. so far the dual system is working well.

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What if it was made of stainless steel?
It was tried and failed. well plain steel not stainless
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Old 11-13-2012, 04:46 PM   #8663 (permalink)
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The piston would probably be better off had it been made from ss. I always wondered why they didn't go from al to ss, but I guess it just had to do with manufactoring/machining costs. There was once a rumor about a brass piston but tbh I never really understood that idea and in any case it never materialized. I think one of the main consensuses on why the pistons would snap (normally around the first oring groove from it's head) has been due to pressure spikes, given that adding an inline reg to prevent the inline reg from spiking over 300psi seems to have solved the piston problem for a number of people. But of course the piston might be snapping for other reasons I just don't understand(?).

If you want to avoid sending you thumper in for the newest piston upgrade (the thickest version that seems to actually work long term), get an inline reg for your thumper and change out all o-rings as you plan. Lube gun regularly and correctly. As you're getting a used thumper, make sure the actuating valve works if the previous user had problem with it (input limit is 300psi, not a problem with inline regs and for some lucky thumper owners where their internal thumper reg seems to have worked out fine).

Sorry that last sentence was a little jumbled lunchbreak's what it is

edit - sorry cp, I always forget you're already running it with a reg upstream of your thumper's input

Last edited by toymachine; 11-13-2012 at 09:24 PM.
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Old 11-13-2012, 06:33 PM   #8664 (permalink)
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Thankx for the info. I think as soon as it gets here, the new project on my lathe will be a ss piston. I will keep you posted on how that works.
I guess I better order a actuating valve as well just in case.
I will go threw the post to find out where to get that from.
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Old 11-13-2012, 07:22 PM   #8665 (permalink)
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The valves you can get from clippard or any of their distributors if you have one near.
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Old 11-13-2012, 09:22 PM   #8666 (permalink)
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Quote:
Originally Posted by Rage 01 View Post
Thankx for the info. I think as soon as it gets here, the new project on my lathe will be a ss piston. I will keep you posted on how that works.
I guess I better order a actuating valve as well just in case.
I will go threw the post to find out where to get that from.
talk to joedirt, you can find one of his posts a page or two back to pm him, he found a way (what redlaser666 said) to get valves way cheaper than the 20 or 40 or whatever metadyne offers them for (no idea on the actual number, I just know it's significantly higher), and he might still have an extra one to sell you.

a legit ss piston would be awesome! I look forward to your project

if ss doesn't work, is it on to some crazy ti compound then?!

Edit: I'm not saying ss won't work
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Old 11-13-2012, 10:38 PM   #8667 (permalink)
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Quote:
Originally Posted by capitalpaintball View Post
My thought is that: the air filling the dump chamber is just escaping for a fraction of a second before the piston head seals the chamber.
I am going to try a spacer between the head and the shaft but I dont want to make the piston to long.
looks to me like the pring groove has enogh space for one more oring.
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mailmanmike Since Monday! That's more than 4 hours though, so according to those cialis ads I should see my doctor.
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Old 11-13-2012, 11:11 PM   #8668 (permalink)
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that's the back of the piston. the head has the middle sized o-ring. I tried to add another o-ring but it didn't fit right.
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Old 11-13-2012, 11:46 PM   #8669 (permalink)
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^I've tried the same thing with the older problematic pistons and had the same results as capitalpaintball

I'd love to see your spacer idea and/or hear a little more about how you think it'll help/work btw
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Old 11-14-2012, 12:06 AM   #8670 (permalink)
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Quote:
Originally Posted by capitalpaintball View Post
that's the back of the piston. the head has the middle sized o-ring. I tried to add another o-ring but it didn't fit right.
I know. Is it possible that may be where the air is coming through during recock?
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THE-SHOOTIST Anyone chubbin' like me for this?
mailmanmike Since Monday! That's more than 4 hours though, so according to those cialis ads I should see my doctor.
tlane77 I think for a non-chemical chubby it's 6 hours before its time to see a doctor. So you should be good for another couple hours.
splattttttt I wasn't goin to google "chubbin" because I assumed it had to do with fat. The lard type, not the fun stuff. But what ever feelings Jeff's experiencing, then they must be of the fun like stuff...
tlane77 He's got a woody for your woods.
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