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Why doesnt my igniter ignite?

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Why doesnt my igniter ignite?

Unread postAuthor: ryguy » Sun Sep 17, 2006 6:23 am

Well I was looking around and i found this site, and i saw that purell mini, i wanted to build one like it, i have a mini scope mouthwash bottle, with a pen tube through the cap, snuggly. So, i got a bbq lighter, and it make a spark in the ligher, when I took it out, it won't spark on thumb tacks or anything, am I doing somthing wrong?
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Unread postAuthor: jrrdw » Sun Sep 17, 2006 6:28 am

Your point of ignition may be gaped to wide, to much fuel, wired wrong. Could be bad fuel, put up some pics, it's hard to give accurit advise not being able to see it.
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Unread postAuthor: ryguy » Sun Sep 17, 2006 6:29 am

well that was a fast response :D thanks.
but right now, im not using any fuel, i cant get the thing to spark yet :(

the gap is 1-2cm
is there supposed to be 2 wires coming out of it btw?
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Unread postAuthor: ryguy » Sun Sep 17, 2006 6:31 am

if i attached a wire to the wire from the igniter, so both thumb tacks were wired, would that help?
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Unread postAuthor: jrrdw » Sun Sep 17, 2006 6:34 am

Yes 2 wires, 1 at the bottem, (the ground), and 1 near the top, (possitive). The gap should be way closer the that, around .020, about like a lawnmower sparkplug, the closer the gap, the hotter the spark.
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Unread postAuthor: ryguy » Sun Sep 17, 2006 6:35 am

oh :D well thanks alot. ill let you know how it turns out :)
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Unread postAuthor: ryguy » Sun Sep 17, 2006 6:56 am

grr still doesnt work :cry: ill never get a combustion launcher :(
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Unread postAuthor: jrrdw » Sun Sep 17, 2006 7:55 am

Take it back out and try it on it's own again, maby it's dead from to much munipalation. Just guessing.
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Unread postAuthor: Taternator » Sun Sep 17, 2006 1:29 pm

when my combustion wouldnt launch all i did was get a rag or a shammy and wipe as much in there as i can for some reason when i sprayed the screws it wouldnt spark and when i wiped the screws clean they light up like christmas lights trey that (wiping the screws or w/e u used)
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Unread postAuthor: POS » Sun Sep 17, 2006 1:33 pm

what do you use as explosive ? Hairspraiy or something like that ? It could be that the screws get dirty of it, and the can't form a spark that way. Propane is cleaner.
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Unread postAuthor: zafabafa » Sun Sep 17, 2006 1:56 pm

i made a mini aswell. but my spark doesnt make the propane ignite, im sure it doesnt leak cause i burnt my hairs on my hand when i did it with a naked flame (lighter) :shock:
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Unread postAuthor: POS » Sun Sep 17, 2006 2:00 pm

hehe, that's a pretty stupid thing to do, isn't it :lol:
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Unread postAuthor: zafabafa » Sun Sep 17, 2006 4:52 pm

it kinda is :roll: but could it be my spark isnt hot enough?
i used one from a pretty expensive lighter but that doesnt garantee anything :(

tried it with very little deo (propane) and i tried loads. Neither worked, must have done it 10 times
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Unread postAuthor: POS » Mon Sep 18, 2006 2:50 am

guess the spark isn't big enough ...
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Unread postAuthor: zafabafa » Mon Sep 18, 2006 7:58 am

i think im gonna try it on a bigger scale, o you know the bb gun pellet bottles, the one with the pooring nozzle? that must be sick :shock: :twisted:
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