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| Obctg |
 Posted: 01/11/2007 18:33 PM Post subject: Gun not firing... |
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Private First Class
Joined: 27 Nov 2005
Posts: 26
41.72 Spud Bux
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i just built a new gun
the chamber is a 24"x4" PVC, with a stun gun wiht single electrodes in the middle and a 80mm chamber fan in the reare of the gun, at the bottom of the female cleanout adapter. i injected 4 seconds of propane witht he fan running and the gun did not fire. i then tried axe in differing amounts no more than 5 seconds worth, and alternated between fan on and off during fueling.
any help would be appreciated |
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| Bluetooth |
| Posted: 01/11/2007 18:37 PM Post subject: |
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Brigadier General
Joined: 27 Jun 2006
Posts: 828
34.79 Spud Bux
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| What are you putting the propane with? With my mini with a 13" 1.5" chamber I put like 4 sec of propane with a torch head in the back and close it and you cant just spray the axe on the fan. |
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| garrettee |
| Posted: 01/11/2007 19:01 PM Post subject: |
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Master Sergeant
Joined: 22 Dec 2006
Posts: 174
2.17 Spud Bux
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| I use a stun gun too. When I first tried it I had my electrodes too far apart, I'm sure you checked that. And the other thing I could suggest to check is your air fuel mixture, I know you spoke of fiddiling wih it, maybe you should try some more. Too much or too little propellant can cause misfire. That's all I personally know to to tell you. Good luck. |
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| benstern |
| Posted: 01/11/2007 19:20 PM Post subject: |
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Donating Member
Joined: 21 Sep 2005
Posts: 905
159.02 Spud Bux
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| are you sure the fan is not blowing the propane out? |
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| Bluetooth |
| Posted: 01/11/2007 19:24 PM Post subject: |
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Brigadier General
Joined: 27 Jun 2006
Posts: 828
34.79 Spud Bux
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| Thats a very good point. Iay ouldway evernay oughtthay ofay atthay... |
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| frankrede |
| Posted: 01/11/2007 20:08 PM Post subject: |
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Sangheili
Joined: 20 Jul 2006
Posts: 3133
699.80 Spud Bux
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| enough with the pig latin loser. |
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| Bluetooth |
| Posted: 01/11/2007 20:24 PM Post subject: |
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Brigadier General
Joined: 27 Jun 2006
Posts: 828
34.79 Spud Bux
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Thats wasn't nice  . Ok I guess I might stop... Sometimes. |
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| frankrede |
| Posted: 01/11/2007 23:01 PM Post subject: |
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Sangheili
Joined: 20 Jul 2006
Posts: 3133
699.80 Spud Bux
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| Lol, sorry I wa mad awhen I wrote that but pig latin is one of those things that set me off. |
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| Bluetooth |
| Posted: 01/12/2007 17:26 PM Post subject: |
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Brigadier General
Joined: 27 Jun 2006
Posts: 828
34.79 Spud Bux
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| I'm changing all the Pig Latin comments to English for you (I got other complaints). |
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| CpTn_lAw |
| Posted: 01/12/2007 17:39 PM Post subject: |
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Colonel
Joined: 11 Sep 2005
Posts: 554
201.03 Spud Bux
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| the people i see using combustion, use way too much fuel for their cannon...4 seconds is way too much. Try two sprays of 1/2 second. you will see the difference. i use a mini igniter. A good propane/butane - air mix could be ignited with a small spark. 4 % of gaz for 96 % of air. With 4 seconds of spraying, you get at least 10/12 % of gaz. usualy it works for most people cuz they have very hot sparks. But that doesn't solve the problem. It's like eating too much, and drinking a lot of Coca cola to disolve everything!! this isn't a solution, the real solution is, eat less....here, put less fuel and tell me if it did something.... |
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| Obctg |
| Posted: 01/12/2007 22:35 PM Post subject: |
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Private First Class
Joined: 27 Nov 2005
Posts: 26
41.72 Spud Bux
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| are you taking in to account that my gun has a 301.3 cui chamber voulume |
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| CpTn_lAw |
| Posted: 01/13/2007 5:47 AM Post subject: |
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Colonel
Joined: 11 Sep 2005
Posts: 554
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Yes i am, i had a 4" wide for 25" long chamber, and i was like spraying 3 seconds, the spark was there, but very purple and not intense. i sprayed two seconds, it ignited, but in a long WOOSH and continued burning inside for a second. I sprayed one second, and woaw, a loud wave of blue flame came out. 4 percent is very few compared to 5 seconds of spraying.
If there is a spark inside your chaber, the problem is only a matter of putting too much or not enough gaz. Here, trust me, you put too much. |
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| Obctg |
| Posted: 01/13/2007 14:19 PM Post subject: |
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Private First Class
Joined: 27 Nov 2005
Posts: 26
41.72 Spud Bux
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| what were u using as your fuel? |
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| garrettee |
| Posted: 01/14/2007 10:55 AM Post subject: |
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Master Sergeant
Joined: 22 Dec 2006
Posts: 174
2.17 Spud Bux
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| I believe three days ago I said to check the air-fuel mixture. I won't do that again, sorry for bothering you. |
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| Pete Zaria |
| Posted: 01/14/2007 12:55 PM Post subject: |
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Resident Computer Guru
Joined: 31 Mar 2006
Posts: 967
929.49 Spud Bux
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@Obctg,
Try a can of starter fluid (hardware or automotive store). My cannon has a 250ci chamber and a 1/2 second spray in the middle of the chamber works fine. It doesn't take much of it at all.
Starter fluid has a good amount of power to it - it will blow apart coke bottle combustions (My friend learned that the hard way). But it's fine in PVC/ABS as far as I know. I've used it in my ABS gun a lot before I got a metered propane setup.
Peace,
Pete Zaria. |
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