cheap and efficient venting system ... maybe ...

nightshot · Thu Dec 20, 2007 6:09 am

i will build a combustion spudgun with propane regulator and a venting system, but i was thinking if is possible to make a cheap and efficient venting system, a fan goes very weel, but i want a venting system that don't need to open the chamber ....
so... how about this one:

yes, a air pump..

(click to enlarge)
very simple but i think it work right ?

BigGrib · Thu Dec 20, 2007 6:35 am

you gotta sit here and think how many pumps is it gonna take for you to equal the volume inside the chamber to force out burnt gasses. use a damn PC Fan and 2 9V batteries wired in series.

Hubb · Thu Dec 20, 2007 6:39 am

nightshot wrote:...but i want a venting system that don't need to open the chamber ....

How about this one?

You will still want a fan for performance purposes.

nightshot · Thu Dec 20, 2007 7:57 am

BigGrib wrote:you gotta sit here and think how many pumps is it gonna take for you to equal the volume inside the chamber to force out burnt gasses. use a damn PC Fan and 2 9V batteries wired in series.

maybe 10 pumps ??? o.O

hubb017 wrote:
nightshot wrote:...but i want a venting system that don't need to open the chamber ....

How about this one?

You will still want a fan for performance purposes.

how that thing works ?

Hubb · Thu Dec 20, 2007 8:04 am

nightshot wrote:...
hubb017 wrote:
nightshot wrote:...but i want a venting system that don't need to open the chamber ....

How about this one?

You will still want a fan for performance purposes.

how that thing works ?

Like this

VH_man · Thu Dec 20, 2007 8:37 am

why doesnt someone make a pneumatic to vent their combustion? lol.

still, go with the exhaust fan thing............ its not that hard to make.

hell, all you really need is a check valve in the back. then just turn your fan on and WALA it sucks in air..........

either that or just put a ball valve back there.

fred · Fri Dec 21, 2007 3:03 am

If you look in the album, I had submitted a simple hand operated mixing and exhaust fan. I have 3 guns with that fan. It takes a few spins on the weighted knob.

nightshot · Fri Dec 21, 2007 3:42 am

sunday i will buy the parts to build my advanced spud, so... I think i will use a pc fan...
but i really want a quick exhaust system

BigGrib · Fri Dec 21, 2007 4:03 am

nightshot wrote:
BigGrib wrote:you gotta sit here and think how many pumps is it gonna take for you to equal the volume inside the chamber to force out burnt gasses. use a damn PC Fan and 2 9V batteries wired in series.

maybe 10 pumps ??? o.O

10 pumps my arse, and you would rather sit there pumping that damn thing than open a ball valve on the back of the cannon and flip a switch to turn on the fan wait 5 seconds close the valve and inject the propane. i'm not a bettin man but i'd go with the fan and ball valve.

why is it that you don't want to open the chamber between shots. i mean come on

flamerz14 · Fri Dec 21, 2007 10:58 pm

OR, you could use the bike pump as the chamber. keep the handle there as a stock and then you can easily vent out the gases.Put a pin through the handle to stop it from moving when fired.