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Piston help

A place to ask general spud cannon related questions.
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Piston help

Unread postAuthor: Cminion » Mon May 23, 2005 11:32 pm

i have read a bunch on pistons and the help but could someone explain exactly how they work, how to build the piston and the chamber , and how much more they help. thx for any help i been doing alot of research and can find plenty of info on how to make a piston but not what it does, how it works , and how to make the camber and everything to get it to work.
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Unread postAuthor: spudshot » Tue May 24, 2005 3:16 am

you should join the spudtech.com forums, a member there named clide has made several animations of different piston valves
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Unread postAuthor: bigred » Tue May 24, 2005 9:55 am

since this is somewhat on topic, i made an ultra mini piston the other day.
it has a 1" tee with 3/4 coupling as the piston, but it took a long time to grind down the coupling for it to fit in the tee properly.
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Unread postAuthor: iamthewalrus » Tue May 24, 2005 1:30 pm

while we're talking about pistons could someone answer one quick question for me. what opens faster, a diaphram or a piston?? i really would like to know for my next gun.
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Unread postAuthor: bigred » Wed May 25, 2005 5:24 am

diaphragm opens faster, but pistons dump more air. taht's why supah valves are so loud and so popular: they have the fast opening of a diaphragm, and the air dumpage (hehe) of a piston.
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Unread postAuthor: drac » Wed May 25, 2005 6:54 am

bigred wrote:diaphragm opens faster, but pistons dump more air. taht's why supah valves are so loud and so popular: they have the fast opening of a diaphragm, and the air dumpage (hehe) of a piston.


The supah valve is not as fast as a diaphragm and it never will be. The piston is just to heavy to open fast enough, even if it is super light weight. Have you ever heard of marketing strategies?

The supah is a chamber sealing valve, and there are ones that are more powerful than it. Someone on spudtech did some testing and found that a supah is less powerful than a barrel sealing valve of the same dimensions.
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Unread postAuthor: SpudStuff » Thu May 25, 2006 10:34 pm

Spuah valves are a big waste of a hundred dollars
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Unread postAuthor: Benny » Fri May 26, 2006 3:39 am

imagine a piston made of styrofoam. :D
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Unread postAuthor: schmanman » Fri May 26, 2006 5:17 am

It would blow into little tiny pieces at like ,6 psi ,and even if it held ,it would probobaly not seal.if you reinforced it with fiberglass, it might work. Oohh,what if you made a piston (hollow though) from layered carbon fiber. expensive,but very light and strong
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Unread postAuthor: jrrdw » Fri May 26, 2006 5:36 am

Yea, carbon fiber sound promiseing, you can get it on ebay in the remote control airplane listings. I see it there from time to time, but i've never worked with it before, i bet it would make a great piston!
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Unread postAuthor: Benny » Fri May 26, 2006 5:37 pm

schmanman wrote:It would blow into little tiny pieces at like ,6 psi ,and even if it held ,it would probobaly not seal.if you reinforced it with fiberglass, it might work. Oohh,what if you made a piston (hollow though) from layered carbon fiber. expensive,but very light and strong

ah crap it was a joke.
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Unread postAuthor: saladtossser » Fri May 26, 2006 7:16 pm

some of the best inventions started out as a joke
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Unread postAuthor: rna_duelers » Sat May 27, 2006 8:06 am

What about the hard styra foam pushbike helmets have inside of them,its hard,but not quite hard enough.What if your joke turned out to be the next best thing since compressed air and PVC were joined in holy matramony.My jaw hurts, i got wisdom teeth removed :x .
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