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Piston Rebuild Well Worth it *vids*

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Piston Rebuild Well Worth it *vids*

Unread postAuthor: chaos » Wed Sep 12, 2007 7:53 am

Well after 2 and a half weeks with a jammed piston i have rebuilt my s400's piston valve.
I made a new pilot seal, bored and cleaned the EQ hole, got a new spring that is nearly ideal, i also cut a new sealing face and replaced the nylok nut.

this video below was 3 half full aluminum deodorant cans lined up in a row and shot at with a marble at about 180psi.


[youtube]http://www.youtube.com/watch?v=tRnItaCbht4[/youtube]

the valve has now been shot about 10 times since and has not yet jammed or spat the sealing face/and or not re-sealed.

after the rebuild i have noticed a louder report, deeper penetration and more reliability towards re-sealing and firing.

i have been playing around with spring tensions and piston travel with spacers and different springs and so far the best i have found is a spring that holds 35lb of pressure and with a travel distance of about 18mm.

just though i'd share this with you and also feel free to comment and ask questions.

~Case.
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Damage: ~ Brut cans.
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Unread postAuthor: experament-u2 » Wed Sep 12, 2007 8:04 am

:lol:
finally its working again!
great damage could you do a penetration test with a sinker at 300psi or something ?

great work anyway mate
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Unread postAuthor: Fnord » Wed Sep 12, 2007 8:13 am

If you'll notice there is a small symbol on all of the cans that looks like a little flame. This means you should have had an ignition source near them when shooting for maximum entertainment.

Anyway, good job for somehow improving on perfection.
I demand a ballbearing test!

What kind of a name is "BRUT" for a deodorant? (though Brut-Impact is kind of fitting)
"I think I'll go home and spray myself down with a can of Brut"
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Unread postAuthor: chaos » Wed Sep 12, 2007 8:36 am

What kind of a name is "BRUT" for a deodorant? (though Brut-Impact is kind of fitting)
"I think I'll go home and spray myself down with a can of Brut"
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lol lol hahaha lol,

sinker and ball bearing test surly to come, stay tuned.
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Unread postAuthor: jackssmirkingrevenge » Wed Sep 12, 2007 9:19 am

Is the spring really necessary? If it's just there as a bumper, why not use a section of rubber instead?
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Unread postAuthor: f.c » Wed Sep 12, 2007 4:14 pm

soooooooooooo beautiful. and you're an Aussie may i ask which state you are in. looks like nsw to me.
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Unread postAuthor: chaos » Wed Sep 12, 2007 4:38 pm

@F.C, nooooo, not nsw.... im in Victoria.

@JSR, yer it is necessary,because of where and how i charge it the sping is necessary, it re-seals the piston after each shot, and i dont use a bumper.

does anyone else use springs to reseal their pistons?

below is a pic of where my fill point is
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Unread postAuthor: jackssmirkingrevenge » Wed Sep 12, 2007 4:52 pm

Your current setup is great but it would make more sense in terms of performance to fill through the pilot area and eliminate the spring altogether, can't you thread the schrader into the blowgun somehow?
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Unread postAuthor: c19o » Wed Sep 12, 2007 4:52 pm

Very nice gun, what kind of pipe are you using for the chamber?
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Unread postAuthor: chaos » Wed Sep 12, 2007 5:00 pm

c19o, here is a link to the showcase page you will find what your looking for & some more

http://www.spudfiles.com/forums/s400-sn ... t7862.html
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Unread postAuthor: mopherman » Wed Sep 12, 2007 5:34 pm

can we have pics of the new piston?
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Unread postAuthor: jrrdw » Wed Sep 12, 2007 5:49 pm

I use a spring in mine. I put a piece of wooden dowel inbetween the spring and sprinkler valve, i did it that way to protect the sv from the spring but quickly figured out the shimming and bumper and resealing properities, and was real happy about it then. I'm going to watch the video now, cool beans man!
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Unread postAuthor: Novacastrian » Wed Sep 12, 2007 9:15 pm

Great! Brilliant even :)
Btw, That's some nice scenery that surrounds your house.
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Unread postAuthor: chaos » Thu Sep 13, 2007 3:15 am

Novacastrian wrote:Great! Brilliant even :)
Btw, That's some nice scenery that surrounds your house.


cheers mate, i might have to order some of those groovy polyurethane pellets of yours and test them out.

i shot a sinker today, it kicked like a mule and the scope hit me in the face. :cry:
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Unread postAuthor: wannabie » Thu Sep 13, 2007 4:07 am

*drools profously* I really gotta make me a good pistin gun.

BTW whats the name of that song?
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