venting piston

[pat123]

I made a 1 inch piston but i can't vent it with a blowgun. I made a half inch piston to vent the 1 inch piston and the blowgun won't vent that either.
I don't have a nozzle on the blowgun and i made the hole on the piston in the blowgun bigger. I may drill out th einlet hole. is there any chance of messing up the blowgun by doing this? how much will this help.

[Gippeto]

If you can't pilot such a small piston with a blow gun, then something isn't right.

Can you put up pictures and details of your pistons and blow gun?

[pat123]

I am going to try it on my 2inch piston that i spent a little more time on first and see if that works. if it does i definitly need to make a better piston.

[SpudFarm]

why not get a 1/4" ball valve to se if it is possible to vent?

[daberno123]

For information regarding modding the blowgun, noname did a write-up on it in this thread

Some pics of your piston valves would be nice. The only thing I can think of is that your pistons are too loose. Finding a tighter fitting piston or adding an o-ring may solve your problem.

[pat123]

yeah a 1/4 inch ball valve will vent it. i think the problem is that it is in steel pipe with a seam and it can't slide very good with the seam in the pipe.

[psycix]

You could shove in another pipe (but this one is seamless) for the piston to travel in.
If the piston is too loose:
Try adding a few layers of duct tape around the piston, if that works, you should try to add an o-ring if possible. I dont know whether the seam will "be compatible" with the o-ring though.

[pat123]

i may mold a piston in the pipe that will have a slot for the seam.

[psycix]

You could always try to sand down the seam a bit. Is it very rough or is it a smooth seam?