| T O P I C R E V I E W |
| n/a |
Posted - May 22 2003 : 4:09:09 PM
hi aaron i have been making a spud gun today and it was a bit of a failure
i had a 1.5" copper pipe and on that i put a u bend in the same thickness pipe. that was the chamber
i have tryed using many fules including butane,deodrent and petrol.
the problem is that it takes ages for it to ignite and eventualy the igniter broke. Which was a electronic lighter that i had wire up to a spark plug. am i doing somthing wrong
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| 8 L A T E S T R E P L I E S (Newest First) |
| cirvin |
Posted - Jul 15 2003 : 5:14:09 PM
Try a small Neon Sign transformer or a relay wired as a buzzer. email me for a simple yet powerfull schematic
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| n/a |
Posted - May 23 2003 : 4:39:38 PM
i it is a piezo electric push button lighter it will fire a spark plug but the arc is not hot enough to make the fuel ignight.
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| Aaron Cake |
Posted - May 23 2003 : 4:06:30 PM
Ah, that explains it. Cigarrette lighters are low voltage devices that heat a coil of wire using high current. This means that the 10,000 V required to fire the spark plug is not present.
A BBQ ignitor is a piezo electric push button that puts out a 30,000V spike when pushed. This is enough to fire the spark plug (for the most part).
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| n/a |
Posted - May 23 2003 : 1:40:33 PM
i dont know what you mean by a bbq lighter
basicaly it is in a fag lighter instead of a flint. it gives a electric current that will light the lighter. i soldered this to 2 wires and connected them to a spark plug
the problem is that i dont think the power is enough
do you know a simple and cheap method of lighting the spud gun.
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| Aaron Cake |
Posted - May 23 2003 : 08:45:30 AM
Tell me more about this "electronic ignitor". If it was just a standard BBQ ignitor, then that's probably your problem. They suck. 
Is it possible you are just using too much fuel? That's a very common mistake for beginners.
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| BEatonNo1 |
Posted - May 22 2003 : 6:13:55 PM
I personally never used the spark plug method myself but usually when you open it up after you fired it the remaining hot gasses rise out the top and fresh air comes in.
Check your lighter perhaps to make shure it is sparking. then you may want to check your connections for a short or loose connection. lastly when you spray in your fuel try not to spray in so much that the electrodes get wet otherwise it doesnt spark well
PS as for the end closed thing, I have seen some pretty silly questons
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| n/a |
Posted - May 22 2003 : 5:10:15 PM
dont be silly the end was closed off and the spark plug was working
i think it was the electric lighter that was getting worse and it stopped
do you have any suggestions of how to get O2 in to the barrel as it doesnt light very well and also any better ignighters
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| BEatonNo1 |
Posted - May 22 2003 : 4:41:06 PM
I didnt exactly understand your descripion. is one end closed off? secondly are your electrical contacts getting wet if they get wet then they dont work. lastly is there a potato in the gun, otherwise most of the fuel leaks out
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