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| sooch90 |
 Posted: 11/04/2006 11:42 AM Post subject: Mounting the Ignition System |
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Private
Joined: 04 Nov 2006
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Hey, I'm building my first Potato Cannon. I cut the PVC pipes to the correct lengths and and cemented some of the pieces together. However, I'm stuck on mounting the Ignition System. I've seen a couple of configurations, but I'm not sure which to use.
I would prefer having the actual "red button part" (sorry I don't know the name of it) of the BBQ igniter half way in the combustion chamber with only the red button sticking out of it. However, the "red button part" of the BBQ igniter is made of plastic. It also doesn't have a nut or some sort of screwing mechanism to secure it in place. Instead it has 2 plastic clips
See the 2 clips?
Do you guys think that would be enough to prevent the button from blasting out of the Combustion Chamber?
The other configuration I was think of was having the "spark box" (again sorry I don't know the name) inside of the combustion chamber. I don't have a way to secure it INSIDE of the combustion chamber so it would kind of hang there. Then drill holes in the combustion chamber so the wires could come out of the Combustion Chamber. The wires would then be connected to the "red button part" and the "red button part" would be taped down to the OUTSIDE of the combustion chamber via duck tape.
That's the "red button part" with the wires connected to the "spark box".
So what do you guys think I should do? Thanks in advanced for any help!
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| sgort87 |
| Posted: 11/04/2006 12:34 PM Post subject: |
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The Gort
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I really really really really suggest making an ignition handle like on my Streamlined Simple Combustion. It is truly amazing and costs maybe a dollar.
You can also add your own angles and such to raise the hadle away or angle it up at 45 degrees or something.
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| sooch90 |
| Posted: 11/04/2006 14:00 PM Post subject: |
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| All right, i'll think about it, but I'd prefer just putting the igniter on the gun. But my questions still stands, would the explosion inside of the combustion chamber damage the plastic igniter?
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| MisterSteve124 |
| Posted: 11/04/2006 14:38 PM Post subject: |
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Colonel
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| You can't mount the igniter on the gun. It would fly out at very high speeds. You don't even have to mount it you can just have it dangling and just press the button. You don't need that metal box it is used specifically for grills. Just cut the wire and strip off the plastic on the outside.
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| SpudBlaster15 |
| Posted: 11/04/2006 14:46 PM Post subject: |
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Human blast shield
Joined: 18 Oct 2006
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| sooch90 wrote: | | All right, i'll think about it, but I'd prefer just putting the igniter on the gun. But my questions still stands, would the explosion inside of the combustion chamber damage the plastic igniter? |
Mounting a grill igniter in the chamber wall or in the cleanout plug is NOT a good idea. Chances are, it will blow out as they are not pressure rated, taking your hand with it. Gort's handle suggestion is a good one. You could make something like THIS, which would be far safer and easier to use than a chamber mounted igniter.
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| sooch90 |
| Posted: 11/04/2006 14:50 PM Post subject: |
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| MisterSteve124 wrote: | | You can't mount the igniter on the gun. It would fly out at very high speeds. You don't even have to mount it you can just have it dangling and just press the button. You don't need that metal box it is used specifically for grills. Just cut the wire and strip off the plastic on the outside. |
all right yeah. I did see a couple of videos where they mounted the red button igniter actually on the combustion chamber.
Okay here is my idea for the ignition system.
I think the picture might be a little blurry, but you guys should be able to see it. The wires go into the combustion chamber and I'll strip down the wires from there after they pass through the drilled holes.
However, I'm a little concerned with the drilled holes that the wires go through. The wires don't perfectly fit in the holes, so there is some space between the wire and the drilled holes. How would I properly get rid of the spaces and insulate the holes?
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| SpudBlaster15 |
| Posted: 11/04/2006 14:56 PM Post subject: |
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Human blast shield
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| Attach the wires to screws which will thread into the chamber, forming a seal and a spark gap that will be unaffected by combustion pressure, unlike one that is formed using wires.
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| Flying_Salt |
| Posted: 11/04/2006 15:00 PM Post subject: |
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Post whored my way up
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| You should be fine with it dangling there, just seal it off with some caulk and let the caulk dry completely. If you move it around before it dries, you'll get some hot air on yor arm. (like I did).
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| sooch90 |
| Posted: 11/04/2006 15:11 PM Post subject: |
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Ah caulk, good idea. thanks!
| SpudBlaster15 wrote: | | Attach the wires to screws which will thread into the chamber, forming a seal and a spark gap that will be unaffected by combustion pressure, unlike one that is formed using wires. |
Currently I still have that "spark box" still in the combustion chamber. Couldn't I just leave that in there? Or would the explosion in the chamber damage the metal "spark box"?
And if I do use your idea, what do you by "...screws which will thread into the chamber"? Should I attach the wires to the tip of the screws, and drill the whole thing in? or should I attach the wires to the heads of the screws on the outside of the chamber?
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| Flying_Salt |
| Posted: 11/04/2006 15:31 PM Post subject: |
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Post whored my way up
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This is what the screw setup will look like.
The wires are attached to the tops of the screws, which are screwed in a short distance apart. A spark should jump across.
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| Here is something like that on my mini. Use screws, not nails. |
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| sooch90 |
| Posted: 11/04/2006 15:35 PM Post subject: |
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| SpudBlaster15 |
| Posted: 11/04/2006 15:38 PM Post subject: |
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Human blast shield
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| sooch90 wrote: | | should I attach the wires to the heads of the screws on the outside of the chamber? |
Yeah. How did you mount that box in the chamber? Do you have a picture?
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| sooch90 |
| Posted: 11/04/2006 16:02 PM Post subject: |
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| SpudBlaster15 wrote: | | sooch90 wrote: | | should I attach the wires to the heads of the screws on the outside of the chamber? |
Yeah. How did you mount that box in the chamber? Do you have a picture? |
sure
It spark box is sort of just dangling inside of the combustion chamber. I guess I could duck tape it down or something...
So do you guys think that would just be okay leaving the spark box in there?
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| SpudBlaster15 |
| Posted: 11/04/2006 16:48 PM Post subject: |
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Human blast shield
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| That should work fine, but make sure you seal the holes that the wires run through very well. Epoxy would probably be your best bet.
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| MrCrowley |
| Posted: 11/04/2006 16:54 PM Post subject: |
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Blizzard of Ozz
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| put the bbq igniter in 20mm pvc pipe and get a pipe clamp and screw the pipe to the chamber using the clamp,try and get screws with brass rods on the end to screw it to the chmaber and hook the wires up to the screws,thats what i did so if you need a pic...
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