How to Buld a Spud Gun with a Spark Plug

I made a spud gun a while back and it was pretty basic. I had a 3 foot ABS 1 ½” pipe attached to a 3” combustion chamber. For some reason I couldn’t get the ignition to work. I tried everything from lantern lighters to barbeque spark button. The same problem happened every time, the hairspray got really sticky and covered the terminals so it didn't spark. One day I was driving a car and got the idea of maybe I could use a spark plug system for my ignition. I went home and started researching and I found out that it is possible.

So the theory is that a car ignition system make a very hot spark so it will keep the spray from sticking to the plug.

Since I am going to remodel my gun I decided to make a few tweak.

• First expand the combustion chamber
• Change the place for the combustion chamber
• Install a spark system
• Put the trigger in an easier place to get at
• Put a shoulder strap on it

Materials Needed

1 1 1/2"abs piping 3 feet long
2 1 1/2 " elbow 90 degrees
2 1 1/2" pipe 2 inches long
1 3" to 1 1/2" threaded flush bushing
2 3" threaded to smooth coupling
1 3" abs piping 10" long
1 forked coupling 3" x 3" x 2"
1 3" abs piping 2" long
1 spark plug
1 lug nut
1 old ignition coil for a car
2 spark plug wires
1 switch
battery
PVC glue
5 minute epoxy glue


Alright, so here is the basic remodel of the gun. I like the tactical style that the gun has now

I am going to be using a 1/2" spark plug and a spark plug wire

My Trigger is a small button that is taped to the arc that connects the barrel and the combustion chamber

The combustion chamber has a cap on the end for the spark plug then a angle coupling with a cap on the end of that. I put that on here because i realized that if i was going to put the plug on the cap then i would have to remove the plug wire in order to fill it up with spray again. the chamber itself is about 1 1/2 feet long and the barrel is 3 feet long.

This is the 3" cap that goes on the end for the spark plug. i drilled a hole on the top of it just big enough for the spark plug to fit. then I put a lug nut in it and epoxied around it. a lug nuts thread is compatible with the spark plug. If you don't epoxy around it then fire power and spit out of the back, and not only can it hurt you but it can make you loose power for shooting.


the reason why i picked the angled instead of the T is because i figured that it will be spraying towards the barrel before it reached the plug so i have more time to get the gun ready before the spray starts sticking to the spark plug.

OK so as of right now i still need the ignition coil and a small 12 volt battery. and that is pretty much it. i don't know if it will work but i am hoping that it will.