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Will it work? Is their to much room between the barrel and pilot for the piston? I can't get it shorter without the serviceable piston. In real life it is about 1 foot.

Well now...........

1. Wye's are not pressure rated, do not use them.
2. since your drawing is crude, what do you need 4"-3" for and i dont know what you are talking about.
3. You dont need that extra space behind the pilot area (chamber), so use a elbow to make it a over-under.
4. Weight does matter, the lighter the piston the better.
5. Try to find a 3" tee, and a 3" fitting piston, it will be easier.
6. It shouldnt take more than 5psi to seal a good piston.
7. It it could work, disregarding the serious explosive hazards that can serverly hurt you.

Better, cleaner picture needed, and modified with what i have told you.

The "Y" is concerning me as well are you using pressure rated pipe? can you identify pressure rated pipe?

LikimysCrotchus5 wrote:Well now...........

1. Wye's are not pressure rated, do not use them.
2. since your drawing is crude, what do you need 4"-3" for and i dont know what you are talking about.
3. You dont need that extra space behind the pilot area (chamber), so use a elbow to make it a over-under.
4. Weight does matter, the lighter the piston the better.
5. Try to find a 3" tee, and a 3" fitting piston, it will be easier.
6. It shouldnt take more than 5psi to seal a good piston.
7. It it could work, disregarding the serious explosive hazards that can serverly hurt you.

Better, cleaner picture needed, and modified with what i have told you.

Alright I will. Since I want to get an aluminum piston I'm sure I can get it to fit.

What pilot valve are you using?

With a ballvalve and a quick connect you shouldnt need that "Y"

Edit: Oh, and may I suggest using PVC rather than Wye...

XxtriviumxX wrote:Edit: Oh, and may I suggest using PVC rather than Wye...

A wye is PVC.

Please make sure you know what you are talking about before passing information along, it's dangerous.


@The OP,

Read this so you know how to indetify the correct type of PVC to use (pressure rated):
http://www.spudfiles.com/spud_wiki/inde ... _Rated_PVC

My mistake...

XxtriviumxX wrote:What pilot valve are you using?

With a ballvalve and a quick disconect you shouldnt need that "Y"

Edit: Oh, and may I suggest using PVC rather than Wye...

How do I fit a ballvalve on an endcap? Is a quick disconnect a tire stem?

jonnyboy wrote:

XxtriviumxX wrote:What pilot valve are you using?

With a ballvalve and a quick disconect you shouldnt need that "Y"

Edit: Oh, and may I suggest using PVC rather than Wye...

How do I fit a ballvalve on an endcap? Is a quick disconnect a tire stem?

Well you can use a 1/4 inch metal ball valve if you make a hole in the cap and tap it.




Quick connect


Tire stem valve

LikimysCrotchus5 wrote:

jonnyboy wrote:

XxtriviumxX wrote:What pilot valve are you using?

With a ballvalve and a quick disconect you shouldnt need that "Y"

Edit: Oh, and may I suggest using PVC rather than Wye...

How do I fit a ballvalve on an endcap? Is a quick disconnect a tire stem?

Well you can use a 1/4 inch metal ball valve if you make a hole in the cap and tap it.

How and what is a "tap". So you would get the quick connect in the endcap then hook up the hose from the compressor. Then what would the ball valve hook up to?

If I use a 2'' tee with a 2'' piston and a 2'' barrel how do I get the piston to stop. Or do I have to go to a 3'' tee?

I think its about time you do some more searching.

Agreed. You lack some basic but compulsory knowledge to build a piston.

MrCrowley wrote:Agreed. You lack some basic but compulsory knowledge to build a piston.

Hey I'm here to learn. Can you point me toward some helpful links that will help me.

The search function, the Spud Wiki and the Pneumatic Cannon Showcase section.
http://www.spudfiles.com/forums/search. ... 557feef1bb
http://www.spudfiles.com/spud_wiki/inde ... =Main_Page


And these may help:
http://www.spudfiles.com/forums/how-to- ... 10381.html
http://www.spudfiles.com/forums/piston- ... t8157.html


But of course you searched before posting this topic and found those before didn't you


And don't give me any crap about the search function, it works perfectly fine as long has you have half a brain and know how to use common sense to filter 800 results down to 50.