New style (PDI) piston impact buffer

2808 Views 13 Replies 8 Participants Last post by Killer, Jun 29, 2012

Killer

Discussion Starter · Jun 27, 2012 (Edited)

New style (PDI) piston impact buffer (Silencing Project)

I have modded my piston and piston head of my PDI Raven cylinder kit (well, a vacuum piston actually, with the raven cylinder kit)

First off, i added sorbo padding ot the cylinder kit. We have a brand of cleaning wipe things, called sorbo. I still dont know if its the same stuff you all use, but its soft...and...impact absorbing i guess?

I layered 4 layers (Superglued), and roughly cut them up to shape. To make the hole more round and refined, i used a soldering bit to round the hole, and then scraped the burnt (and hardened) sorbo away. Stuck it to the cylinderhead with superglue, and it seems to be holding up fine. (I replaced the impact O-ring from the Cylinderhead with Sorbo)

Then i saw the piston having an impact O-ring (rather small). Since rubber tends to deflect impact, rather than absorb, i first thought of a sorbo pad aswel. Seeing as this would most likely hinder the vacuum valve, i went searching in my O-ring stash, and found a tapered kind of oring....thing..
Seems to fit like a glove, and best of all, IT FITS PERFECTLY IN THE CYLINDERHEAD!

So i still do not know how much this will silence my shots, since i have forgotten to bring my barrel assembly. Reports will come soon!

Nuff talk, I'll let the pictures do the talking from here on out. (more pics will be available as soon as my own phone is back from repairs T.T)

Sorbo-Modded Cylinderhead, Funky O-ring PDI Piston

Funky PDI piston closeup!

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1 - 14 of 14 Posts

inthetallgrass

· #2 · Jun 27, 2012

Just my opinion but I can't see that 'tapered' o-ring staying for very long on the piston head, and when it does come out it'll be darn annoying...

Still the sorbo looks promising, but that seems like it could come off easy too unless applied really well with awesome-sauce glue.

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WorstInFinlanD

· #3 · Jun 27, 2012

I don't think that pad is the "real" sorbo, it looks too foamy, as sorbo is solid.

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MGunner

· #4 · Jun 27, 2012

It's not real sorbothane, but that stuff looks like it will work..

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whisper

· #5 · Jun 27, 2012

Why can't PDI just make the front of their pistons like the laylax pistons. Seriously, the o-ring system is a POS that falls apart. Rant over

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Killer

Discussion Starter · #6 · Jun 27, 2012

the tapered oring is quite large at the base, and tapers thin at the end. Its superglued at the base, and seems to hold quite nice.

About the sorbo, i figured you guys used other stuff. I wonder if it will even hold. (and where the hell i can get some 'real' sorbo sheets around here)
This sorbo is like a kitchen pad thingy...very soft to the touch and squishy. It looks like open-cell-foam.

I was also worried about the 'o-ring' falling off, but i expect (read: Hope) that it will stay on, and push the 'sorbo' away a bit to ensure good vacuum effect. Also, i think the sorbo will keep the rubber from shooting off.

I'll see if i can test it out tomorrow. Might be able to squeeze some footage out with my povcam. (That came out dirtier than i thought lol)

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SilentScope

· #7 · Jun 27, 2012

This is a review a while ago if you're still curious about sorbo pads. (Primarily for the L96):
http://www.airsoftsniperforum.com/showthread.php?t=4193

This is the trusted brand of sorbo pads: www.sorbopads.com

Locations such as evike sell these now so I would recommend checking the websites you normally frequent.

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WorstInFinlanD

· #8 · Jun 27, 2012

You can get them from ebay for a good price, 50d is good for basr because the piston won't be hitting it 20-60 times a second.

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oderfa

· #9 · Jun 27, 2012

whisper said:
Why can't PDI just make the front of their pistons like the laylax pistons. Seriously, the o-ring system is a POS that falls apart. Rant over

Mind telling telling that to my FF cylinderset? I have cylinder/head, piston/head, spring guide and sprind from FF but it is everything but tight air seal. Problem is that the piston head isn't thight enough so air flows around it

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whisper

· #10 · Jun 27, 2012

oderfa said:
Mind telling telling that to my FF cylinderset? I have cylinder/head, piston/head, spring guide and sprind from FF but it is everything but tight air seal. Problem is that the piston head isn't thight enough so air flows around it

Maybe put a something under the O-ring so it sticks out more. I was talking more about the VSR-10 Laylax pistons rather than the ones with the cup seal. I wish Polar Star made a piston for PDI springs..

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oderfa

· #11 · Jun 28, 2012

If you'r talking about the O-ring on the sylinderhead I have already put teflon tape under it so there shouldn't be any leaking. Leaks come from the pistonhead. Have tried guarder and ff but no. I'm talkin about aps parts.

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Killer

Discussion Starter · #12 · Jun 28, 2012

i've just tested the rig with and without my "sorbo" buffers...and the dampening was less that satisfactionary.

The sorbo layers seemed to have crushed into a hard mess, which resulted in a hard hit, instead of an absorbing hit. I'm going to test this with a new sorbo pad, but this time, i'll try to keep to minimum super-glue-ing. If that doest work, i'll try sewing the pads together.

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toomanybbs

· #13 · Jun 29, 2012

Question, not to hijack the thread, but why would you add sorbathane to the cylinder head?

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Killer

Discussion Starter · #14 · Jun 29, 2012

I am trying to reduce the impact noise from the piston hitting the cylinderhead. This can be achieved by impact absorbing materials, like open-cell foam.

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