SpudFiles

Recently, i made my second, more traditional, spudgun. the problem is i only got it to shoot once and it didnt shoot very good, but thats because the potato didnt have a tight enough seal.
well i tried to shoot it again and it didnt work at all. i tried several times, with a lot of fuel, barely any fuel, and everywhere inbetween. nothing. i checked the ignition. it worked. i think it might have something to do with the spark gap. i am using the ignitor from a long nosed lighter. but anyways the spark gap is very small. it has a spark, but a very tiny one. any help/suggestions would be greatly appreciated. im using axe.

i dont care what you say if you have a spark than you dont have the right amount of fuel. an electrick spark is hotter than the surface of the sun so if there is a spark in that chamber with good fuel than is will work. how bigs your chamber i might be able to give you an estimate time for spraying

A spark gap of 1/4" or less should work fine for igniting atmospheric-pressure mixes.

The obvious potential problems I see are

A) fuel/air ratio/mixture is off (try less... or a different fuel)
B) fuel is not mixing with air well enough (chamber fan)
C) temperature/humidity/etc... conditions are creating problems.

Try less fuel. Try using propane from a torch (unmetered, starting with a little bit and working up) or engine starter/carb cleaner.

Try installing a chamber fan (80mm comp fans fit great in 4" pipe, 40mm fans will fit in 2"). A 9v battery and switch will run them. A 9v and two AA's in series make 12v and run it faster....

Make sure you're airing out the chamber between shots well enough, also.

Peace,
Pete Zaria.

ok. ill just let all the fuel in it now just kinda go out by keeping the cannons ends open. the chambers not much bigger then the barrel. i think its the smallest difference adapter for abs piping